iMechanica - concrete
https://imechanica.org/taxonomy/term/3182
en2 post-doc positions available at Northwestern University – Mechanics and Energy Lab
https://imechanica.org/node/25607
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/73">job</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/1166">post-doc</a></div><div class="field-item odd"><a href="/taxonomy/term/10396">electrochemistry</a></div><div class="field-item even"><a href="/taxonomy/term/584">mechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/2317">Soil</a></div><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Dear Colleagues,</p>
<p> </p>
<p>with this message, I would like to advertise <strong>2 post-doctoral research positions at the intersection of electrochemistry and mechanics of materials</strong> in my lab at Northwestern University. The two post-doctoral projects will specifically focus on the influence of <strong><em>electrodepositions</em></strong> on the structure, properties, and behavior of <strong><em>soils</em></strong> (project 1) and <strong><em>concrete</em></strong> (project 2).</p>
<p> </p>
<p>Interested candidates are encouraged to apply as soon as possible following the guidelines enclosed in the attached description of the positions. The positions will start on January 1, 2022, or as soon as possible thereafter, and will last one year with the possibility of a contract extension after that period.</p>
<p> </p>
<p>I look forward to interacting with interested candidates.</p>
<p> </p>
<p>Best regards,</p>
<p>Alessandro</p>
</div></div></div><div class="field field-name-upload field-type-file field-label-hidden"><div class="field-items"><div class="field-item even"><table class="sticky-enabled">
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</div></div></div>Tue, 30 Nov 2021 22:32:34 +0000Alessandro Rotta Loria25607 at https://imechanica.orghttps://imechanica.org/node/25607#commentshttps://imechanica.org/crss/node/25607Material Testing: Crucial Step in Bridge Development & Engineering Design
https://imechanica.org/node/23391
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/118">industry</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/696">metal</a></div><div class="field-item even"><a href="/taxonomy/term/934">Composites</a></div><div class="field-item odd"><a href="/taxonomy/term/9771">construction engineering</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Bridge failures underscore the importance of rigorous material testing. The collapse of the incomplete pedestrian bridge at Florida International University on March 2018 is an example where <a href="https://www.enr.com/articles/47108-bridge-designer-testifies-on-evidence-one-day-after-osha-slams-figg">design errors led to growing cracks as described by OSHA</a>.</p>
<p>Although material failure is not the sole reason for bridge failures, it is a crucial step for selecting the right materials, bridge design analysis, and construction testing.</p>
<p>Bridge members include the superstructure, the upper portion made of beams, bearings, curbs, decks, and more and the substructure including abutments, beam seats, piers, and wingwalls. Early bridges were made out of timber, stone, and masonry. Modern bridges are currently built using concrete, steel, fiber reinforced polymer (FRP) composites, and a combination of materials. Material properties taken into account include <span>durability</span>, <span>corrosion</span>, <span>fatigue resistance</span>, weight of material, maintenance requirements, service life, and cost.</p>
<p>Material science plays an <a href="https://www.admet.com/the-importance-of-materials-testing/">important role in the selection of the correct materials</a> in bridge design and their implementation in bridge construction. Each material has its own benefits and must be analyzed carefully depending on the bridge size, location, environment, expected loads, and more. Mechanical properties of certain materials such as FRP composites can be designed by varying volume and orientation of the fiber reinforcement to allow higher strength. In fact, FRP composites are engineered materials that have been used in bridges after material researchers were able to strengthen the reinforced concrete using other materials such as glass, carbon and aramid fiber reinforced polymers.</p>
<p>Material Testing Solutions
</p><p>ADMET material testing systems can be used to analyze the mechanical properties of a variety of materials including concrete, composites, metals, and more. Read more <a href="https://www.admet.com/material-testing-crucial-step-in-bridge-development-engineering-design/">here </a>or see below for recommended solutions.</p>
<p>Concrete Testing
</p><p>ADMET has been involved with concrete testing for many years, from retrofitting simple compression test frames with servo control to providing advanced high temperature systems to measure the Modulus of Elasticity and Poisson’s Ratio at operating temperatures. Analysis routines are built in to the software for ease of use and fast time-to-results.</p>
<p>EquipmenteXpert 2600 Dual Column Testing Machine<br /></p><p id="caption-attachment-13314" class="wp-caption-text"> </p>
<p><a href="https://www.admet.com/expert-2600-for-astm-c1609-concrete-testing/">eXpert 2600</a> series universal testing systems are offered in table top and floor standing configurations up to 400kN (90,000lbf) force capacity. The servo-control motor allows running tests at very slow net deflection rates. Consequently, higher capacity eXpert 2600 models equipped with MTESTQuattro software are often used for running complex testing standards such as ASTM C1609.</p>
<p>eXpert 1600 Servohydraulic Testing Machine
</p><p><a href="https://www.admet.com/expert-1000/">eXpert 1600</a> servo-hydraulic testing systems, capable of measuring up to 600kN (135,000lbf), are designed to perform tension, compression, and flexion tests.</p>
<p>Both the eXpert 2600 and the eXpert 1000 universal testing systems can be equipped with a variety of accessories including simple compression platens or spherically seated compression platens, the ASTM C469 compressometer-transducer assembly, ASTM C1609 bend fixture assembly with two transducer installed, as well as the EN 14651 bend fixture with one transducer mounted mid-point on the fixture.</p>
<p>MegaForce Automatically Controlled Hydraulic Power Unit
</p><p><a href="https://www.admet.com/megaforce-concrete-compression-tester/">The MegaForce Testing System</a> was developed in order to address the issues with manually-operated concrete systems and the high costs associated with conventional servo-hydraulic testing systems designed with large and expensive actuators, the system can be used with compression machines that operate up to 69 MPa or 10,000psi. Depending on the indicator chosen with the system, automated compressive strength test reports are generated, saving time as well as costs required to manually generate reports while decreasing the chance of errors. Some examples of ADMET indicators used in concrete testing applications can be seen below.</p>
<p><a href="https://www.admet.com/wp-content/uploads/2015/07/astm-c109-cement-mortar-compression-testing-pic1.jpg" data-caption="Hydraulic Testing Machine equipped with ADMET’s MegaForce"><img class="size-full wp-image-12449" src="https://www.admet.com/wp-content/uploads/2015/07/astm-c109-cement-mortar-compression-testing-pic1.jpg" sizes=" 525px) 100vw, 525px" srcset="https://www.admet.com/wp-content/uploads/2015/07/astm-c109-cement-mortar-compression-testing-pic1-225x300.jpg 225w, https://www.admet.com/wp-content/uploads/2015/07/astm-c109-cement-mortar-compression-testing-pic1.jpg 525w" alt="Hydraulic Testing Machine equipped with ADMET's MegaForce testing a cement cube" width="525" height="700" /></a><br /></p><p id="caption-attachment-12449" class="wp-caption-text">Hydraulic Testing Machine equipped with ADMET’s MegaForce</p>
<p>DFG Concrete Indicator
</p><p><a href="https://www.admet.com/dfg-concrete-indicator/">DFG indicator</a>, typically used to run ASTM <a href="https://www.admet.com/testing-applications/testing-standards/astm-c39-concrete-cylinder-compression-testing/">C39</a>, <a href="https://www.admet.com/testing-applications/testing-standards/astm-c78-concrete-beam-bend-testing/">C78</a>, and <a href="https://www.admet.com/testing-applications/testing-standards/astm-c109-cement-mortar-compression-testing/">C109</a> test procedures, reports the peak load and stress along with the specimen geometry, dimensions, date, time, and specimen number. Additional test report parameters often desired by testing labs include the average rate of loading and the cylinder correction factor that are automatically calculated, the operator ID, specimen weight and age, entered by the operator, and the cylinder break type and cap type.</p>
<p>ADMET’s <a href="https://www.admet.com/wp-content/uploads/2018/01/ADMET-gaugesafe-dfg-brochure-2018.pdf">GaugeSafe Data Exchange software</a> is available for DFG indicators to allow the raw test data exported<br />in ASCII comma delimited format for further analysis in common spreadsheet programs.</p>
<p>Gauge Buster 2 Indicator
</p><p><a href="https://www.admet.com/gauge-buster-2-indicator/">Gauge Buster 2</a> features include an Auto-Test-Reset mode for hands free operation, bar graph load rate display, permanent storage of test data and the additional auxiliary (encoder) and strain (analog) channels for running <a href="https://www.admet.com/testing-applications/testing-standards/astm-c469-concrete-compression-testing/">ASTM C469</a> testing.</p>
<p>GaugeBuster 2 Basic can be upgraded with printer capabilities or the USB flash drive port, which allows saving test results, XY data, test settings, and calibration tables directly to a flash drive. In addition, all GaugeBuster 2 models can be equipped with the <a href="https://www.admet.com/wp-content/uploads/2018/07/ADMET-gaugesafe-gb2-brochure-2018.pdf">GaugeSafe Basic, Plus, or Live software</a>.</p>
<p>
</p><p>Considering upgrading from manual to automated concrete testing? ADMET offers a range of equipment for concrete testing, including indicators to be used with existing manually-controlled systems, controllers to retrofit servo-control machines, the MegaForce Concrete Testing system specifically made for concrete testing, as well as servo-control machines that allow a variety of concrete testing to be conducted on a single system. Read more <span><a href="https://www.admet.com/concrete-testing-manual-vs-automated-operation/">here</a></span>.</p>
<p>Composites Testing
</p><p>ADMET offers a full line of electromechanical and servohydraulic universal testing machines for determining the mechanical properties of composite materials. Each system comes equipped with MTESTQuattro® our pc-based materials testing software which is capable of performing tests under force, strain and displacement control. MTESTQuattro® will also generate stress vs. strain curves and determine strength, modulus and yield properties in tension, compression, shear and flexure according to common ASTM composite material test methods.</p>
<p>Operators may choose either electromechanical or servohydraulic testing systems to perform common ASTM testing standards such as:</p>
<ul><li><a href="https://www.admet.com/astm-c273-sandwich-core-shear-testing/" target="_self">ASTM C273 – Standard Test Method for Shear Properties of Sandwich Core Materials</a></li>
<li><a href="https://www.admet.com/astm-c297-sandwich-construction-tensile-testing/" target="_self">ASTM C297 – Standard Test Method for Flatwise Tensile Strength of Sandwich Constructions</a></li>
<li><a href="https://www.admet.com/astm-d3039-polymer-matrix-composite-tensile-testing/" target="_self">ASTM D3039 – Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials</a></li>
<li><a href="https://www.admet.com/astm-d3410-polymer-matrix-composite-shear-load-testing/" target="_self">ASTM D3410 – Standard Test Method for Compressive Properties of Polymer Matrix Composite Materials with Unsupported Gage Section by Shear Loading</a></li>
<li><a href="https://www.admet.com/astm-d5379-composite-shear-testing/" target="_self">ASTM D5379 – Standard Test Method for Shear Properties of Composite Materials by the V-Notched Beam Method</a></li>
</ul><p>Equipment<a href="https://www.admet.com/wp-content/uploads/2015/07/astm-d3518-composite-shear-testing-pic1.jpg" data-caption="eXpert 1000 Series equipped with High-Capacity Wedge Grips"><img class="size-full wp-image-12710" src="https://www.admet.com/wp-content/uploads/2015/07/astm-d3518-composite-shear-testing-pic1.jpg" sizes=" 393px) 100vw, 393px" srcset="https://www.admet.com/wp-content/uploads/2015/07/astm-d3518-composite-shear-testing-pic1-147x300.jpg 147w, https://www.admet.com/wp-content/uploads/2015/07/astm-d3518-composite-shear-testing-pic1.jpg 393w" alt="" width="393" height="800" /></a><br /></p><p id="caption-attachment-12710" class="wp-caption-text">eXpert 1000 Series equipped with High-Capacity Wedge Grips</p>
<p>eXpert 2600 Dual Column Testing Machine
</p><p><a href="https://www.admet.com/expert-2600/">eXpert 2600</a> series dual column electromechanical testing machines are offered in table top units to 100kN (22,500 lbf) and floor standing units to 400kN (90,000 lbf). These testers have the wide column spacings and force capacities to perform a variety of composite testing including tension, compression, shear, and flexion.</p>
<p>eXpert 1600 Series Servo-Hydraulic Static Testing Machine
</p><p><a href="https://www.admet.com/products/universal-testing-machines/expert-1000/">eXpert 1600</a> series static test systems are available in capacities from 50kN (11,250 lbf) to 600kN (135,000 lbf). The hydraulic power supply and electronics are integral with the frame thereby saving valuable lab space.</p>
<p>eXpert 1900 Series Servo-Hydraulic Dynamic Testing Machine
</p><p><a href="https://www.admet.com/products/fatigue-testing-machines/expert-1900-high-force-fatigue-testing-machine/">eXpert 1900</a> series dynamic test systems are available in capacities from 10kN (2,250 lbf) to 250kN (55,000 lbf). Each eXpert 1900 Series tester is engineered to meet the force-stroke-frequency requirements of each application. Depending on the size of the hydraulic power supply (HPU), the 1900 Series HPU is either integral to the frame or free-standing.</p>
<p>Metals Testing
</p><p>ADMET materials testing systems determine important characteristics of metals like elastic modulus, yield, elongation, reduction of area, n-value, R-value, Poisson’s ratio, fracture toughness plus many torsional properties.</p>
<p>Operators may choose either electromechanical or servohydraulic testing systems to perform common metals ASTM testing standards such as:</p>
<ul><li><a href="https://www.admet.com/astm-a370-mechanical-testing-of-steel-products/" target="_self">ASTM A370 – Standard Test Methods and Definitions for Mechanical Testing of Steel Products</a></li>
<li><a href="https://www.admet.com/astm-a938-metal-wire-torsion-testing/" target="_self">ASTM A938 – Standard Test Mehod for Torsion Testing of Wire</a></li>
<li><a href="https://www.admet.com/astm-e8-metal-tensile-testing/">ASTM E8 – Standard Test Methods for Tension Testing of Metallic Materials</a></li>
<li><a href="https://www.admet.com/astm-e111-structural-materials-modulus-testing/" target="_self">ASTM E111 – Standard Test Method for Young’s Modulus, Tangent Modulus, and Chord Modulus</a></li>
<li><a href="https://www.admet.com/astm-e399-metallic-material-fracture-toughness-testing/" target="_self">ASTM E399 – Standard Test Methods </a><a href="https://www.admet.com/astm-e399-metallic-material-fracture-toughness-testing/" target="_self">for Linear-Elastic Plane-Strain Fracture Toughness KIc of Metallic Materials</a></li>
<li><a href="https://www.admet.com/astm-e646-strain-hardening-exponent-testing/" target="_self">ASTM E646 – Standard Test Method for Tensile Strain-Hardening Exponents of Metallic Sheet Materials</a></li>
</ul><p>Equipment<a href="https://www.admet.com/wp-content/uploads/2015/08/tension-metal-testing-per-astm-e8.jpg" data-caption="Metal Tension Testing per ASTM E8"><img class="wp-image-15209 size-medium" src="https://www.admet.com/wp-content/uploads/2015/08/tension-metal-testing-per-astm-e8-225x300.jpg" sizes=" 225px) 100vw, 225px" srcset="https://www.admet.com/wp-content/uploads/2015/08/tension-metal-testing-per-astm-e8-225x300.jpg 225w, https://www.admet.com/wp-content/uploads/2015/08/tension-metal-testing-per-astm-e8.jpg 500w" alt="Metal tension testing per ASTM E8" width="225" height="300" /></a><br /></p><p id="caption-attachment-15209" class="wp-caption-text">Metal Tension Testing per ASTM E8</p>
<p>eXpert 2600 Dual Column Testing Machine
</p><p>All <a href="https://www.admet.com/expert-2600/">eXpert 2600</a> systems are capable of performing reliable and repeatable tension, compression, peel, and flexure tests. ADMET offers a full line of grips, fixtures, load cells, extensometers as well as heating and cooling for our systems.</p>
<p>eXpert 1600 Series Servo-Hydraulic Static Testing Machine
</p><p>The <a href="https://www.admet.com/products/universal-testing-machines/expert-1000/">eXpert 1600</a> servohydraulic testing systems are widely used to test metal products at load capacities up to 600kN. ADMET’s easy to use servohydraulic systems provide precision by avoiding compensating for piston friction and operating with highly accurate, self-identifying ADMET load cell technology. The pumping system fits inside the machine table on most models, resulting in a compact design.</p>
<p>eXpert 1900 Series Servo-Hydraulic Dynamic Testing Machine
</p><p>The <a href="https://www.admet.com/products/fatigue-testing-machines/expert-1900-high-force-fatigue-testing-machine/">eXpert 1900</a> dynamic servohydraulic testing machines perform fatigue testing of metals at forces up to 250kN (55,00 0lbf). These systems allow automatic calculation of key parameters such as number of cycles to failure, maximum load at failure, dynamic modulus, fracture toughness, and more. These systems can be modified to the operator’s needs. Customizable features include the separation between columns, the vertical test space, the power stroke, and the location of the piston.</p>
<p>eXpert 9000 Series Torsion Testing Machine
</p><p>The length of the test bed or frame structure of <a href="https://www.admet.com/products/torsion-test-machines/">eXpert 9000</a> series torsion systems can be modified to accommodate varying specimen lengths and sizes. Load cells and displacement sensors can be incorporated to measure axial forces and spindle displacement. Torsion testing machines are available in vertical or horizontal orientations for static and fatigue testing applications.</p>
</div></div></div>Wed, 26 Jun 2019 16:24:13 +0000Deniz Yalcin23391 at https://imechanica.orghttps://imechanica.org/node/23391#commentshttps://imechanica.org/crss/node/23391PhD position - Development of mesoscale hydro-chemo-mechanical (HMC) modeling approach for concrete deterioration.
https://imechanica.org/node/22536
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/73">job</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2106">PHD position</a></div><div class="field-item odd"><a href="/taxonomy/term/1566">Computational Modeling</a></div><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/12146">deterioration</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span>Objectives</span>
</p><p><span>The main aim of this project is to develop a robust computational framework for investigating the hydro-chemo-mechanical aspect of concrete carbonation at meso-scale.</span></p>
<p><span>Description</span>
</p><p><span>The existing reinforced structures and infrastructure are under continuous deterioration due to environmental actions. Carbonation is one of the most common causes of concrete deterioration as it induces chemical changes in cement paste microstructure, can cause shrinkage and cracking and can also lead to reinforcement corrosion. Reliable estimation of the extent of carbonation and its consequences on the structural performance is critical for taking intervention or repair actions. In order to develop a predictive physics-based model, this study will focus on developing a hydro-chemo-mechanical (HMC) model to capture concrete carbonation at meso-scale. Furthermore, experimental test will be performed to validate the developed model. </span></p>
<p><span>Studentship summary</span>
</p><p><span>The PhD position is available from 1st October 2018. The studentship covers both tuition fees and a tax-free student stipend at RCUK rates (£14,777 per annum) for 2018/19 academic year. Duration is 3 years.</span></p>
<p><span>Due to funding restrictions, this studentship is open to UK/EU candidates only.</span></p>
<p><span>Entry requirements</span>
</p><p><span>We are seeking an enthusiastic and highly motivated person with good interpersonal skills and a keen interest in research. You must have, or expect to achieve, at least a 2:1 honors degree or a distinction or high merit at MSc level (or international equivalent) in Civil Engineering, Materials science, mathematics or a related subject. Preference will be given to candidates with educational and/or research experience in engineering and materials science. Experience in object-oriented programming (especially with Python or Fortran) would be an advantage, but not essential. The candidate will be expected to have good interpersonal skills.</span></p>
<p><span>This studentship is open until filled. Early application is strongly encouraged.</span></p>
<p><span>For application, please submit a covering letter and CV to Dr. Bahman Ghiassi (<a href="mailto:bahman.ghiassi@nottingham.ac.uk">bahman.ghiassi@nottingham.ac.uk</a>). Further information or enquiries about the vacancy can also be asked from the same contact. </span></p>
</div></div></div>Tue, 31 Jul 2018 09:11:26 +0000bahmanghiassi22536 at https://imechanica.orghttps://imechanica.org/node/22536#commentshttps://imechanica.org/crss/node/22536Automation vs. Manual Control in Concrete Testing
https://imechanica.org/node/22507
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/118">industry</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/5844">Material Testing</a></div><div class="field-item even"><a href="/taxonomy/term/2841">material science</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Concrete is one of the most widely used materials around the world. The construction industry is often involved in a wide array of testing which requires a variety of testing equipment. In addition to simple compression testing, testing standards such as ASTM C39, ASTM C109, ASTM C469, ASTM C1609 are among the test methods that can be followed to measure the mechanical properties of a concrete specimen. This blog post covers the mechanical testing of concrete in lab environments, its automation, and ways of achieving it.</p>
<p>Mechanical Testing of Concrete
</p><p>In order to determine that the mechanical properties of a concrete specimen meet the strength and deflection requirements for its intended application, concrete samples with specific dimensions are prepared, mold cured, and tested following the appropriate instructions or a standardized test method. At the end of the tests, strength reports are created either manually or by automatic analysis.</p>
<p>Automation in Concrete Testing and Ways of Achieving It
</p><p>Benefits of concrete testing with automatic control include reduction of testing times, elimination of data entry errors, and the increased speed in delivering the results. Automation includes the automatic control of the machine as well as the automatic calculation of the tested properties. When a machine is servo-controlled, it is operated through a controller or its software. The test procedure to be run and the analyses to be calculated are entered in the system and results are automatically generated.</p>
<p>An important note to add here is that certain features of full-automation can be made feasible by adding digital indicators to manually operated systems. Reliable indicators designed for the concrete industry can combine client, contractor, mixture proportion, and field data with the calculated compressive strength data such as peak load or the breaking strength with user-selected parameters including date, time, specimen number, specimen geometry and break type. Certain indicators also allow the use of concrete testing software. Test results can be transferred to a computer running a database program and automatically imported.</p>
<p>Is Manual or Automated Operation more appropriate for my concrete testing?
</p><p>Manually operated systems are often sufficient for concrete testing applications. Nevertheless, certain test standards governing the concrete industry require strain rate feedback that is not possible to achieve with manual operation.</p>
<p>For some concrete tests, it is required to have verifiable loading rate throughout the testing as concrete exhibits loading-rate sensitivity relative to compressive strength. Certain ASTM standards, such as ASTM C39, specify or limit the loading rate to a certain value or a range in order to ensure consistency within and among laboratories. When equipped with the right digital indicator, the average loading rate can be calculated and reported according to ASTM C39 requirements even if the testing was performed on a manually controlled machine. In addition to other features specifically beneficial for the concrete industry, depending on the selected digital indicator, load and stress versus time data and curves can be generated.</p>
<p>For others, such as ASTM C1609, it is necessary to maintain a low, constant speed throughout the test. Digital indicators do not control the testing machines, so operators are required to manually adjust a valve to achieve the specified rates. Hence, it is not possible to accurately follow standards that require constant low speed testing with manually operated systems. Servo-control equipment with controllers that are used to control the movement of the machine is recommended for such testing. </p>
<p>Concrete Testing Equipment
</p><p>ADMET offers a range of equipment for concrete testing, including indicators (<a href="https://www.admet.com/products/controllers-and-indicators/pi-peak-load-indicator/">Pi indicators</a>, <a href="https://www.admet.com/products/controllers-and-indicators/dfg-concrete-indicator/">DFG Concrete Indicator</a>, <a href="https://www.admet.com/products/controllers-and-indicators/gauge-buster-2-indicator/">GaugeBuster 2</a>) to be used with existing manually-controlled systems, controllers to retrofit servo-control machines, the <a href="https://www.admet.com/testing-applications/materials/concrete-testing/megaforce-concrete-compression-tester/">MegaForce Testing System</a> specifically made for concrete testing, as well as servo-control machines (<a href="https://www.admet.com/products/universal-testing-machines/expert-2600/">eXpert 2600</a>, <a href="https://www.admet.com/products/universal-testing-machines/expert-1000/">eXpert 1600</a>) that allow a variety of concrete testing to be conducted on a single system while generating accurate and repeatable results. Furthermore, ADMET works to meet unique customer requirements and has the ability to engineer customized systems.</p>
<p>Click here for the full blog post: <a href="https://www.admet.com/concrete-testing-manual-vs-automated-operation/%20">https://www.admet.com/concrete-testing-manual-vs-automated-operation/ </a></p>
<p> </p>
</div></div></div>Tue, 17 Jul 2018 20:27:05 +0000Deniz Yalcin22507 at https://imechanica.orghttps://imechanica.org/node/22507#commentshttps://imechanica.org/crss/node/22507Eigenerosion for static and dynamic brittle fracture
https://imechanica.org/node/21507
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/11744">eigenerosion</a></div><div class="field-item odd"><a href="/taxonomy/term/32">fracture mechanics</a></div><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/2970">Structural Engineering</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span>In contrast to many numerical methods, the eigenerosion approach yields a convenient description of fracture handled in the postprocessing part of a Finite Element Analysis (FEA). Its fully energetic formulation avoids the introduction of extra degrees of freedom to model fracture propagation. Following previous works on eigenerosion, in this publication, a modified formulation of eigenfracture it is introduced, where it is distinguished between compression and tension loaded state. This formulation has the advantage that it relates the crack propagation process only to tensile loading. The procedure is implemented using a spectral decomposition of the strain field. The application of the method to brittle fracture makes it suitable for materials like concrete. The accuracy of the method is assessed for linear elasticity in statics and dynamics for two- and three-dimensional problems.</span></p>
<p> </p>
<p><span><a href="http://www.sciencedirect.com/science/article/pii/S0013794417302989">http://www.sciencedirect.com/science/article/pii/S0013794417302989</a></span></p>
<p><span><a href="https://www.researchgate.net/publication/317724499_Eigenerosion_for_static_and_dynamic_brittle_fracture">https://www.researchgate.net/publication/317724499_Eigenerosion_for_stat...</a></span></p>
</div></div></div>Mon, 14 Aug 2017 15:37:02 +0000Flavio Stochino21507 at https://imechanica.orghttps://imechanica.org/node/21507#commentshttps://imechanica.org/crss/node/21507Damage plasticity model for concrete failure CDPM2
https://imechanica.org/node/19769
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/4503">concrete damage plasticity</a></div><div class="field-item even"><a href="/taxonomy/term/4460">Constitutive model</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Those involved in the modelling of the failure of plain/reinforced concrete using damage and plasticity might be interested in our webpage</p>
<p><a href="http://petergrassl.com/Research/DamagePlasticity/CDPMLSDYNA/index.html">http://petergrassl.com/Research/DamagePlasticity/CDPMLSDYNA/index.html</a></p>
<p>which we have created to support our concrete damage plasticity model CDPM(2) in LS-DYNA. You can find there a number of example input files, reports and our implementation of the model in the form of a user subroutine.</p>
<p> </p>
</div></div></div>Thu, 21 Apr 2016 23:29:05 +0000grassl19769 at https://imechanica.orghttps://imechanica.org/node/19769#commentshttps://imechanica.org/crss/node/19769How the Ancient Romans Made Better Concrete Than We Do Now
https://imechanica.org/node/17678
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/2841">material science</a></div><div class="field-item even"><a href="/taxonomy/term/31">fracture</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Could be of interest for some of you.</p>
<p><a href="http://io9.com/how-the-ancient-romans-made-better-concrete-than-we-do-1672632593?utm_campaign=socialflow_io9_facebook&utm_source=io9_facebook&utm_medium=socialflow">http://io9.com/how-the-ancient-romans-made-better-concrete-than-we-do-16...</a></p>
<p>Kind regards, </p>
<p>Thomas Laverne</p>
<p>Simulation and Modeling Engineer</p>
<p>Schlumberger</p>
</div></div></div>Thu, 18 Dec 2014 15:26:07 +0000tlaverne17678 at https://imechanica.orghttps://imechanica.org/node/17678#commentshttps://imechanica.org/crss/node/17678How obtain tension strain concrete(σt0) in damaged plasticity model in ABAQUS?
https://imechanica.org/node/17610
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>How obtain tension strain concrete(σt0) in damaged plasticity model in ABAQUS?</p>
<p>hello engineers</p>
<p>i need help about concrete damaged plasticity</p>
<p>fo example :</p>
<p>if Compressive stress (Fu)= 51.2 MPa</p>
<p>and tension stress (σ t)=0.3 x 51.2^(2/3)=4.136</p>
<p>1)why (σ t) is 2.36 in picture(uploaded)?</p>
<p>2)what is tension strain ? and how? i cant understand.</p>
<p>i cant obtain εt = total tensile strain.</p>
<p>how obtain εcr ?</p>
<p>please help</p>
<p> </p>
</div></div></div><div class="field field-name-upload field-type-file field-label-hidden"><div class="field-items"><div class="field-item even"><table class="sticky-enabled">
<thead><tr><th>Attachment</th><th>Size</th> </tr></thead>
<tbody>
<tr class="odd"><td><span class="file"><img class="file-icon" alt="Image icon" title="image/jpeg" src="/modules/file/icons/image-x-generic.png" /> <a href="https://imechanica.org/files/Ashampoo_Snap_2014.12.06_15h25m38s_003_.jpg" type="image/jpeg; length=69410">Ashampoo_Snap_2014.12.06_15h25m38s_003_.jpg</a></span></td><td>67.78 KB</td> </tr>
</tbody>
</table>
</div></div></div><div class="field field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above"><div class="field-label">Forums: </div><div class="field-items"><div class="field-item even"><a href="/forum/109">Ask iMechanica</a></div></div></div><div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/962">software</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-above"><div class="field-label">Free Tags: </div><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/169">Plasticity</a></div><div class="field-item odd"><a href="/taxonomy/term/289">ABAQUS</a></div><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/4503">concrete damage plasticity</a></div><div class="field-item even"><a href="/taxonomy/term/132">strain</a></div><div class="field-item odd"><a href="/taxonomy/term/131">stress</a></div><div class="field-item even"><a href="/taxonomy/term/10247">totallstress</a></div><div class="field-item odd"><a href="/taxonomy/term/2374">engineer</a></div></div></div>Sat, 06 Dec 2014 23:18:23 +0000siren30017610 at https://imechanica.orghttps://imechanica.org/node/17610#commentshttps://imechanica.org/crss/node/17610CONCREEP-10 Conference
https://imechanica.org/node/17081
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/1193">Engineering Mechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item even"><a href="/taxonomy/term/1859">creep</a></div><div class="field-item odd"><a href="/taxonomy/term/6601">shrinkage</a></div><div class="field-item even"><a href="/taxonomy/term/249">durability</a></div><div class="field-item odd"><a href="/taxonomy/term/10039">concrete structures</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span>CONCREEP-10, the 10th Conference on Mechanics and Physics of Creep, Shrinkage and Durability of Concrete and Concrete Structures, </span><span>will be organized</span><span> by t</span><span>he Vienna University of Technology (TU Wien) in cooperation with the Engineering Mechanics Institute of ASCE (EMI). The conference will be held on September 21-23, 2015 at the Vienna University of Technology in Vienna, Austria. It will be chaired by Prof. Christian Hellmich, Prof. </span><span>Johann Kollegger, and Prof. </span><span>Bernhard Pichler, all of TU Wien. The</span><span> </span><span>Honorary Chairman will be Prof. </span><span>Herbert A. Mang, also of TU Wien.</span></p>
<p> </p>
<p><span>Conference topics include:</span></p>
<p class="MsoNormal"><span><!--[if !supportLists]--><span>·<span> </span></span><!--[endif]--><span>Microstructure, setting, and ageing of cementitious materials</span></span></p>
<p class="MsoNormal"><span><!--[if !supportLists]--><span>·<span> </span></span><!--[endif]--><span>Multiscale creep, shrinkage, fracture and durability properties</span></span></p>
<p class="MsoNormal"><span><!--[if !supportLists]--><span>·<span> </span></span><!--[endif]--><span>Constitutive and numerical modeling</span></span></p>
<p class="MsoNormal"><span><!--[if !supportLists]--><span>·<span> </span></span><!--[endif]--><span>Simulation and design of concrete structures</span></span></p>
<p class="MsoNormal"><span><!--[if !supportLists]--><span>·<span> </span></span><!--[endif]--><span>Molecular to lab-scale simulations and characterization</span></span></p>
<p class="MsoNormal"><span><!--[if !supportLists]--><span>·<span> </span></span><!--[endif]--><span>Nano- and micromechanics of cementitious materials</span></span></p>
<p class="MsoNormal"><span><!--[if !supportLists]--><span>·<span> </span></span><!--[endif]--><span>New insights from macroscopic material testing</span></span></p>
<p class="MsoNormal"><span><!--[if !supportLists]--><span>·<span> </span></span><!--[endif]--><span>Monitoring of concrete structures and exploitation of measurement data</span></span></p>
<p class="MsoNormal"><span>·<span> </span></span><span>Creep and shrinkage properties of new cementitious materials</span></p>
<p class="MsoNormal"><span>·<span> </span></span><span>Creep and shrinkage of concrete under extreme conditions</span></p>
<p><span><strong>Important dates:</strong></span></p>
<p class="MsoNormal"><span>Mini-symposia proposal deadline: September 30, 2014</span></p>
<p class="MsoNormal"><span>Mini-symposia acceptance: October 15, 2014</span></p>
<p class="MsoNormal"><span>Abstract submission deadline: November 30, 2014</span></p>
<p class="MsoNormal"><span>Notification of acceptance: January 10, 2015</span></p>
<p class="MsoNormal"><span>Full-paper submission deadline: March 31, 2015</span></p>
<p class="MsoNormal"><span>Early registration deadline: March 31, 2015</span></p>
<p><span>For more details, visit the conference website at <a href="http://concreep10.conf.tuwien.ac.at/home/">http://concreep10.conf.tuwien.ac.at/home/</a>.</span><span><span><span> </span></span></span></p>
<p> </p>
<p> </p>
</div></div></div>Thu, 28 Aug 2014 17:51:12 +0000Amar A. Chaker17081 at https://imechanica.orghttps://imechanica.org/node/17081#commentshttps://imechanica.org/crss/node/17081Lattice modeling of rapid chloride migration in concrete
https://imechanica.org/node/16570
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/8687">lattice model</a></div><div class="field-item even"><a href="/taxonomy/term/9781">ion migration</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Dear all,
</p>
<p>
We recently publsihed a study on modeling rapid chloride migration in concrete using the lattice modeling approach. Registered subscribers can view the article at:
</p>
<p>
<a href="http://www.sciencedirect.com/science/article/pii/S0008884614000799">http://www.sciencedirect.com/science/article/pii/S0008884614000799</a>
</p>
<p>
<a href="http://www.sciencedirect.com/science/article/pii/S0008884614000799"></a>We appreciate any comments or suggestions.
</p>
<p>
Regards
</p>
</div></div></div>Wed, 07 May 2014 14:30:18 +0000shavijabranko16570 at https://imechanica.orghttps://imechanica.org/node/16570#commentshttps://imechanica.org/crss/node/16570Postdoc or Ph.D. position for development of offshore plant substructures at Korea University, Korea
https://imechanica.org/node/16311
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/73">job</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/155">structures</a></div><div class="field-item odd"><a href="/taxonomy/term/538">ph.d.</a></div><div class="field-item even"><a href="/taxonomy/term/985">job opening</a></div><div class="field-item odd"><a href="/taxonomy/term/1117">design</a></div><div class="field-item even"><a href="/taxonomy/term/1287">postdoctoral position</a></div><div class="field-item odd"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item even"><a href="/taxonomy/term/6081">Korea</a></div><div class="field-item odd"><a href="/taxonomy/term/9116">offshore structures</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><strong>Postdoc or Ph.D. position</strong> for development of offshore plant substructures at Korea University, Korea</p>
<p>Structural Engineering & Mechanics Laboratory at the School of Civil, Environmental & Architectural Engineering, Korea University, Korea, has open positions for a Ph.D. student (four years) and a post-doctoral researcher (three years) to pursue research on development of offshore plant substructures funded by Korean government. The position is to commence in August or September 1, 2014.</p>
<p><strong>Requirements</strong></p>
<ul><li>Ph.D. or M.Sc. in Civil Engineering or Mechanical Engineering.</li>
<li>Excellent knowledge in concrete or steel structural design and analysis, and in computational methods.</li>
<li>Knowledge of ABAQUS or similar software.</li>
</ul><p>
<br />
The salary is around 2,000-3,200 USD/month depending on experience and potential, according to the current KRW-USD currency exchange. The salary is paid in Korean Won.</p>
<p>Please send your application including CV, list of publications and transcripts (for PhD-students only) by email to Prof. Goangseup Zi (<a href="http://structure.korea.ac.kr">http://structure.korea.ac.kr</a>) at <a href="mailto:g-zi@korea.ac.kr">g-zi@korea.ac.kr</a>.</p>
</div></div></div>Tue, 25 Mar 2014 14:48:19 +0000gzi84616311 at https://imechanica.orghttps://imechanica.org/node/16311#commentshttps://imechanica.org/crss/node/16311Modelling time dependent concrete properties in ABAQUS
https://imechanica.org/node/15601
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span>I am<br />
carrying out a non-linear analysis of a concrete section subjected to construction<br />
loading. I am looking to model the time-dependent effects of the material<br />
properties as well as creep and shrinkage properties of concrete. In the ABAQUS<br />
manual it states the <em>General Static </em>procedure<br />
cannot be used to model time dependent effects. Naturally the <em>Riks Method </em>would be ideal to account of<br />
the non-linear effects however it doesn’t allow for the use of multiple steps in<br />
the analysis which is necessary to model the various stages of construction<br />
loading. Does anyone have any advice on what would be the the correct analysis<br />
step to implement?</span></p>
<p>Normal<br />
0</p>
<p>false<br />
false<br />
false</p>
<p>EN-IE<br />
X-NONE<br />
X-NONE</p>
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</div></div></div><div class="field field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above"><div class="field-label">Forums: </div><div class="field-items"><div class="field-item even"><a href="/forum/109">Ask iMechanica</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-above"><div class="field-label">Free Tags: </div><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/1859">creep</a></div><div class="field-item odd"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item even"><a href="/taxonomy/term/6601">shrinkage</a></div><div class="field-item odd"><a href="/taxonomy/term/9287">time dependent properties</a></div></div></div>Tue, 05 Nov 2013 22:26:09 +0000daithirothaithi15601 at https://imechanica.orghttps://imechanica.org/node/15601#commentshttps://imechanica.org/crss/node/15601The Multi-scale Modelling Course for Concrete
https://imechanica.org/node/15007
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/1498">modeling</a></div><div class="field-item odd"><a href="/taxonomy/term/2101">multi-scale</a></div><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hi all,
</p>
<p>
Delft University of Technology organizes a course related to multi-scale modelling of concrete. The Multi-scale Modelling Course for Concrete (MMC2) provides the<br />
opportunity for participants to become familiar with modelling<br />
cementitious materials at different levels of detail. Different ways of<br />
schematization and numerical approaches are considered to simulate the<br />
chemical, physical and mechanical behaviour of cementitious materials.<br />
The main back-bone of the course are the different modelling levels at<br />
which heterogeneous and composite cementitious materials can be<br />
schematized and how these different levels can “communicate” by means of<br />
parameters passing methods or by using upscaling models. The modelling<br />
levels that will be distinguished in this course are the nano-, micro-,<br />
meso- and the macro-level. The course emphasizes different modelling<br />
approaches for each scale level and shows a few conceptual techniques of<br />
how the “numerical gaps” can be bridged
</p>
<p>
More details abut the course can be found at:
</p>
<p>
<a href="http://www.citg.tudelft.nl/en/current/events/events-materials-environment/multiscale-modelling-course-for-concrete-mmc/">http://www.citg.tudelft.nl/en/current/events/events-materials-environmen...</a>
</p>
<p>
Regards
</p>
</div></div></div>Wed, 24 Jul 2013 11:23:24 +0000shavijabranko15007 at https://imechanica.orghttps://imechanica.org/node/15007#commentshttps://imechanica.org/crss/node/15007Cracking of the concrete cover due to reinforcement corrosion
https://imechanica.org/node/14568
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/26">cracking</a></div><div class="field-item odd"><a href="/taxonomy/term/314">corrosion</a></div><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/8687">lattice model</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Dear all,
</p>
<p>
Our paper titled "Cracking of the concrete cover due to reinforcement corrosion: A two-dimensional lattice model study"<br />
has just been published in Construction and Building Materials. It deals with numerical modelling of cracking of the concrete cover as a consequence of reinforcement corrosion, based on the Delft lattice model framework. Registered subscribers can download the article at: <a href="http://www.sciencedirect.com/science/article/pii/S0950061813002730">http://www.sciencedirect.com/science/article/pii/S0950061813002730</a>
</p>
<p>
I hope you find it interesting and useful. As always, follow the lates news about our project on: <a href="http://microlab-m3c4.blogspot.nl/">http://microlab-m3c4.blogspot.nl/</a>
</p>
<p>
Thank you.
</p>
<p>
</p>
<p>
</p>
</div></div></div>Mon, 22 Apr 2013 06:48:33 +0000shavijabranko14568 at https://imechanica.orghttps://imechanica.org/node/14568#commentshttps://imechanica.org/crss/node/14568Durability of Reinforced concrete from Composition to Protection
https://imechanica.org/node/14360
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/74">conference</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/31">fracture</a></div><div class="field-item odd"><a href="/taxonomy/term/249">durability</a></div><div class="field-item even"><a href="/taxonomy/term/1498">modeling</a></div><div class="field-item odd"><a href="/taxonomy/term/3182">concrete</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
The 6th International PhD Student Workshop on Durability of Reinforced<br />
Concrete will be held in Delft, The Netherlands, during July 4 and 5,<br />
2013, hosted by TUDelft. After a series of successful workshops, most<br />
recently in Espoo (2012), Madrid (2010) and Guimarães (2009), IPSW2013<br />
will be held under the auspices of RILEM EAC (Educational Activities<br />
Committee), aiming to bring together young researchers in the field of<br />
durability of concrete.
</p>
<p>
This workshop, aimed at PhD students dealing with concrete durability (in a broad sense), is free of charge.
</p>
<p>
More info can be found at: <a href="http://www.citg.tudelft.nl/actueel/congressen-en-symposia/events-materials-environment/durability-of-reinforced-concrete-from-composition-to-protection/">http://www.citg.tudelft.nl/actueel/congressen-en-symposia/events-materia...</a>
</p>
<p>
As always, for newest information on the M3C4 project, make sure that you visit our project blog: <a href="http://microlab-m3c4.blogspot.nl/">http://microlab-m3c4.blogspot.nl/</a>
</p>
</div></div></div><div class="field field-name-upload field-type-file field-label-hidden"><div class="field-items"><div class="field-item even"><table class="sticky-enabled">
<thead><tr><th>Attachment</th><th>Size</th> </tr></thead>
<tbody>
<tr class="odd"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/Reinforced%20Concrete%20compleet.pdf" type="application/pdf; length=2806609" title="Reinforced Concrete compleet.pdf">Reinforced Concrete compleet.pdf</a></span></td><td>2.68 MB</td> </tr>
</tbody>
</table>
</div></div></div>Mon, 18 Mar 2013 09:59:18 +0000shavijabranko14360 at https://imechanica.orghttps://imechanica.org/node/14360#commentshttps://imechanica.org/crss/node/14360Proceedings
https://imechanica.org/node/13889
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/249">durability</a></div><div class="field-item odd"><a href="/taxonomy/term/584">mechanics</a></div><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Dear all,
</p>
<p>
</p>
<p>
Proceedings of the V International PhD workshop dealing with durability of concrete, which was held in Finland in February, have been published. The publication is available for free download at: <a href="http://www.vtt.fi/inf/pdf/technology/2012/T65.pdf">http://www.vtt.fi/inf/pdf/technology/2012/T65.pdf</a> . Many interesting and innovative topic, dealing both with experimental and numerical research of concrete durability, are presented.
</p>
<p>
As always, follow our project blog at: <a href="http://microlab-m3c4.blogspot.nl">http://microlab-m3c4.blogspot.nl</a>
</p>
<p>
</p>
<p>
</p>
</div></div></div>Thu, 13 Dec 2012 13:23:03 +0000shavijabranko13889 at https://imechanica.orghttps://imechanica.org/node/13889#commentshttps://imechanica.org/crss/node/13889Multiscale modeling of fracture processes in cementitious materials
https://imechanica.org/node/13276
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/31">fracture</a></div><div class="field-item odd"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item even"><a href="/taxonomy/term/7978">HYMOSTRUC3D</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Dear all,
</p>
<p>
Today our colleague Zhiwei Qian defended his PhD thesis titled: Multiscale modeling of fracture processes in cementitious material. We would like to congratulate Dr Qian on achieving this. The full thesis is available for download at: <a href="http://repository.tudelft.nl/view/ir/uuid:734b276c-283a-4f7a-8db2-a184453e8dac/">http://repository.tudelft.nl/view/ir/uuid:734b276c-283a-4f7a-8db2-a18445...</a>
</p>
<p>
For furher news on our project, follow our blog at: <a href="http://microlab-m3c4.blogspot.nl">http://microlab-m3c4.blogspot.nl</a>
</p>
<p>
Regards,
</p>
<p>
Branko
</p>
</div></div></div>Tue, 25 Sep 2012 11:34:26 +0000shavijabranko13276 at https://imechanica.orghttps://imechanica.org/node/13276#commentshttps://imechanica.org/crss/node/13276A day in the life...
https://imechanica.org/node/12844
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/314">corrosion</a></div><div class="field-item odd"><a href="/taxonomy/term/3182">concrete</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
New experiments on cracking and corrosion of steel in concrete performed by the M3C4 team. More details at <a href="http://microlab-m3c4.blogspot.nl/">http://microlab-m3c4.blogspot.nl/</a>
</p>
<p>
Cheers!
</p>
</div></div></div>Thu, 26 Jul 2012 14:51:55 +0000shavijabranko12844 at https://imechanica.orghttps://imechanica.org/node/12844#commentshttps://imechanica.org/crss/node/12844News
https://imechanica.org/node/12631
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/420">cracks</a></div><div class="field-item odd"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item even"><a href="/taxonomy/term/7613">chlorides</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hi all,
</p>
<p>
</p>
<p>
Some news are available at our project blog, check them out at: <a href="http://microlab-m3c4.blogspot.nl/">http://microlab-m3c4.blogspot.nl/</a>
</p>
<p>
</p>
<p>
Regards,
</p>
<p>
Branko
</p>
</div></div></div>Tue, 19 Jun 2012 09:41:16 +0000shavijabranko12631 at https://imechanica.orghttps://imechanica.org/node/12631#commentshttps://imechanica.org/crss/node/12631SSCS 2012
https://imechanica.org/node/12554
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/381">Sustainability</a></div><div class="field-item odd"><a href="/taxonomy/term/885">modelling</a></div><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hi all,
</p>
<p>
</p>
<p>
Our research team took part in the conference "Sustainable Solutions for Concrete Structures", which took place in Aix-en-Provence, in France. The conference was dedicated mainly to recent advances in modelling of concrete and concrete structures. As always, more details can be found on: <strong><em>microlab-m3c4.blogspot.com</em></strong>
</p>
<p>
</p>
<p>
Cheers!
</p>
</div></div></div>Sun, 03 Jun 2012 19:17:00 +0000shavijabranko12554 at https://imechanica.orghttps://imechanica.org/node/12554#commentshttps://imechanica.org/crss/node/12554Concrete cracking and durability (first entry)
https://imechanica.org/node/12348
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/32">fracture mechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/249">durability</a></div><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hi all,
</p>
<p>
I am a PhD researcher working on relationship between cracking of concrete and its durability, using both experimental and numerical approaches. The work is being carried out at Delft University of Technology, in the Netherlands. For anyone interested, here is the webpage of the project:
</p>
<p>
<strong><em>microlab-m3c4.blogspot.com</em></strong>
</p>
<p>
Please feel free to send us any comments, suggestions, and possible collaboration proposals using the contact details provided on the website.
</p>
<p>
Branko
</p>
</div></div></div>Thu, 26 Apr 2012 08:09:38 +0000shavijabranko12348 at https://imechanica.orghttps://imechanica.org/node/12348#commentshttps://imechanica.org/crss/node/12348Elastic material in abaqus
https://imechanica.org/node/10452
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p align="left">
Dear all,
</p>
<p>
I am using Abaqus to model concrete as an elastic material. However, the failure criteria available in the software is only for 2D elements and are dominated by a maximum normal stress (fail stress option) or normal strain (fail strain option) value.
</p>
<p>
I was wondering if anyone would know how to model concrete as an elastic material following "theory of elasticity" and failing by a maximum TENSILE strain value in any of the three directions given a material's point.
</p>
<p>
It would also be perfect if deleting elemnts option can be used in this case.
</p>
<p>
NOTE: this model does not involve any form of plasticity or post failure mechanisms...ONLY first cracking limits
</p>
<p>
</p>
<p>
Any help would be very much appreciated
</p>
<p>
</p>
<p>
Thanks
</p>
<p>
</p>
<p>
Hussam Nasreddin
</p>
<p>
</p>
</div></div></div><div class="field field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above"><div class="field-label">Forums: </div><div class="field-items"><div class="field-item even"><a href="/forum/390">Materials Forum</a></div></div></div><div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-above"><div class="field-label">Free Tags: </div><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/6382">Abaqus; Strain; Umat;</a></div></div></div>Wed, 22 Jun 2011 15:30:20 +0000HussamNasreddin10452 at https://imechanica.orghttps://imechanica.org/node/10452#commentshttps://imechanica.org/crss/node/10452Modelling Concrete Beam wrapped with FRP using ANSYS...
https://imechanica.org/node/9583
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/128">education</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/3364">FRP</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hello all,
</p>
<p>
I am faced with a problem of modelling a reinforced concrete beam<br />
wrapped with FRP using ANSYS. Can any one help me out please?
</p>
<p>
I would appreciate your response about this issue. Thnk ya all
</p>
</div></div></div>Wed, 05 Jan 2011 11:52:07 +0000Fascal Mk9583 at https://imechanica.orghttps://imechanica.org/node/9583#commentshttps://imechanica.org/crss/node/9583Two PhD studentships in computational fracture mechanics at the University of Glasgow
https://imechanica.org/node/8736
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/73">job</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/32">fracture mechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/3182">concrete</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
There are <strong>two PhD studentships</strong> available at the University of Glasgow in the area of <strong>computational fracture mechanics of concrete.</strong>
</p>
<p>
The topics are<strong> multiscale modelling of corrosion induced cracking</strong> and <strong>meso-mechanically motivated nonlocal models for fracture</strong>.
</p>
<p>
Please visit my webpage at <a href="http://www.civil.gla.ac.uk/~grassl">http://www.civil.gla.ac.uk/~grassl</a> for more information.
</p>
<p>
All the best,
</p>
<p>
Peter Grassl
</p>
</div></div></div>Fri, 20 Aug 2010 09:45:51 +0000grassl8736 at https://imechanica.orghttps://imechanica.org/node/8736#commentshttps://imechanica.org/crss/node/8736Phd position in computational mechanics
https://imechanica.org/node/8162
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/73">job</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/31">fracture</a></div><div class="field-item odd"><a href="/taxonomy/term/337">Rocks</a></div><div class="field-item even"><a href="/taxonomy/term/384">soils</a></div><div class="field-item odd"><a href="/taxonomy/term/418">xfem</a></div><div class="field-item even"><a href="/taxonomy/term/419">gfem</a></div><div class="field-item odd"><a href="/taxonomy/term/545">damage</a></div><div class="field-item even"><a href="/taxonomy/term/609">homogenization</a></div><div class="field-item odd"><a href="/taxonomy/term/2101">multi-scale</a></div><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/4796">discontinuities</a></div><div class="field-item even"><a href="/taxonomy/term/4799">geomaterials</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
A fully funded PhD position is immediately available in the area of multi-scale modeling of geomaterials within the research project "Failure of cohesive geomaterials: bridging the scales - GEOBRIDGE" at Laboratoire Sols, Solides, Structures - Risques (3S-R), Université Joseph Fourier, Grenoble, France.
</p>
<p>
The aim of this project is to define micromechanically-informed models for macroscopic fracture characterization. This will be done by identifying suitable constitutive laws that represent characteristic failure modes in geomaterials at the microlevel employing analytical and computational homogenization techniques. The student will work under the supervision of Professor Cristian Dascalu (Université Joseph Fourier, France) and Dr Angelo Simone (Delft University of Technology, the Netherlands). The work will be conducted for most of the time in France with periods in the Netherlands.
</p>
<p>
More information can be found in the attachment.
</p>
</div></div></div><div class="field field-name-upload field-type-file field-label-hidden"><div class="field-items"><div class="field-item even"><table class="sticky-enabled">
<thead><tr><th>Attachment</th><th>Size</th> </tr></thead>
<tbody>
<tr class="odd"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/geobridgePHD_1.pdf" type="application/pdf; length=75777" title="geobridgePHD.pdf">geobridgePHD.pdf</a></span></td><td>74 KB</td> </tr>
</tbody>
</table>
</div></div></div>Thu, 06 May 2010 23:17:21 +0000Angelo Simone8162 at https://imechanica.orghttps://imechanica.org/node/8162#commentshttps://imechanica.org/crss/node/8162PhD position in computational mechanics
https://imechanica.org/node/7542
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/73">job</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/31">fracture</a></div><div class="field-item odd"><a href="/taxonomy/term/384">soils</a></div><div class="field-item even"><a href="/taxonomy/term/418">xfem</a></div><div class="field-item odd"><a href="/taxonomy/term/419">gfem</a></div><div class="field-item even"><a href="/taxonomy/term/545">damage</a></div><div class="field-item odd"><a href="/taxonomy/term/609">homogenization</a></div><div class="field-item even"><a href="/taxonomy/term/2101">multi-scale</a></div><div class="field-item odd"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item even"><a href="/taxonomy/term/4796">discontinuities</a></div><div class="field-item odd"><a href="/taxonomy/term/4799">geomaterials</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
A fully funded PhD position is available in the area of multi-scale modeling of geomaterials within the research project <em>Failure of cohesive geomaterials: bridging the scales - GEOBRIDGE</em> at Laboratoire Sols, Solides, Structures – Risques (3S-R), Université Joseph Fourier, Grenoble, France.
</p>
<p>
<strong>Job description</strong> The aim of this project is to define micromechanically-informed models for macroscopic fracture characterization. This will be done by identifying suitable constitutive laws that represent characteristic failure modes in geomaterials at the microlevel employing analytical and computational homogenization techniques. The student will work under the supervision of Professor Cristian Dascalu (Université Joseph Fourier, France) and Dr Angelo Simone (Delft University of Technology, the Netherlands). The work will be conducted for most of the time in France with periods in the Netherlands.
</p>
<p>
<strong>Requirements </strong>We seek candidates with a master degree in engineering, physics, geophysics, applied mathematics, or a related field. Desirable applicants should also possess the following qualifications: good oral and written communication skills, knowledge of continuum mechanics and fracture mechanics, knowledge of the finite element method, good computational background in a scientific programming language.
</p>
<p>
<strong>Conditions of employment</strong><br />
- Estimated salary per month (after taxes): EUR 1.440<br />
- Employment duration: 3 years<br />
- Employment commencement date: no later than September 1st (Wed), 2010<br />
- Location: Laboratoire Sols, Solides, Structures - Risques (3S-R), Grenoble, France and Computational Mechanics Group, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, the Netherlands
</p>
<p>
<strong>How to apply</strong><br />
Inquiries and applications (the latter as a single pdf-file) should be sent by email to <a href="mailto:a.simone@tudelft.nl">a.simone@tudelft.nl</a> or <a href="mailto:Cristian.Dascalu@hmg.inpg.fr">Cristian.Dascalu@hmg.inpg.fr</a>. The application file will include a one-page cover letter describing interests and qualifications for the position, a complete curriculum vitae, the contact information of at least two referees, and a scan of official academic transcripts with an official translation into English if necessary. For full consideration, applications should be received no later than Wednesday, 31st March 2010.
</p>
<p>
More information can be found in the attached file.
</p>
<p>
</p>
</div></div></div><div class="field field-name-upload field-type-file field-label-hidden"><div class="field-items"><div class="field-item even"><table class="sticky-enabled">
<thead><tr><th>Attachment</th><th>Size</th> </tr></thead>
<tbody>
<tr class="odd"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/geobridgePHD.pdf" type="application/pdf; length=76348" title="geobridgePHD.pdf">geobridgePHD.pdf</a></span></td><td>74.56 KB</td> </tr>
</tbody>
</table>
</div></div></div>Sat, 06 Feb 2010 22:35:10 +0000Angelo Simone7542 at https://imechanica.orghttps://imechanica.org/node/7542#commentshttps://imechanica.org/crss/node/7542R C Beams
https://imechanica.org/node/7265
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/750">Beam</a></div><div class="field-item odd"><a href="/taxonomy/term/834">crack growth</a></div><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p align="justify">
I am a novice user of abaqus and trying to model crack growth in rc beams with longitudinal reinforcement and stirrups under dynamic loads by try and error method <img src="modules/tinymce/includes/jscripts/tiny_mce/plugins/emotions/images/smiley-tongue-out.gif" border="0" alt="Tongue out" title="Tongue out" /></p>
<p align="justify">
rebar layers are in shell element and i am using CDP for my concrete. i am trying to find out if i need to have many solid parts or one is enough and if mesh adaptivity is necessary or not because of crack growth <img src="modules/tinymce/includes/jscripts/tiny_mce/plugins/emotions/images/smiley-smile.gif" border="0" alt="Smile" title="Smile" />. I appreciate any consulting in this field and i will share my knowledge with anybody that helps me
</p>
<p align="justify">
my first error message is
</p>
<p align="justify">
3479 nodes on an embedded element do not lie in any host element. Check coordinates, exterior tolerance and absolute exterior tolerance parameters, and the host element set definition. The nodes have been identified in node set ErrNodeEmbeddedNode.
</p>
<p align="justify">
maybe i missunderstand the definition of embedded region and need to revise in it<img src="modules/tinymce/includes/jscripts/tiny_mce/plugins/emotions/images/smiley-wink.gif" border="0" alt="Wink" title="Wink" />.
</p>
</div></div></div>Thu, 17 Dec 2009 21:34:05 +0000Reza Mousavi7265 at https://imechanica.orghttps://imechanica.org/node/7265#commentshttps://imechanica.org/crss/node/7265Modelling RC component with ABAQUS considering bond-slip.
https://imechanica.org/node/7126
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hello, all
</p>
<p>
I am trying to model a corroded beam under loading considering bond-slip effects. Following is the methods i used,
</p>
<ul><li>FRACTION</li>
</ul><p>
I define the interface between the reinforcement and the concrete, then i added fraction and give the fraction coefficient. However without vetical force, the fraction coefficient is useless. I also define the shear limit which brings no improvement too. So i give up this solution.
</p>
<ul><li>SPRING ELEMENTS</li>
</ul><p>
In order to add spring elements between the surface of reinforcement and concrete, i have to model reinforcement useing solid element as the truss element does not exist one surface (i don't know if these right). Then i couping the surface of concrete and reinforcement with RPs respectively . After that i use SPRING2 to connect the two RPs and give the SPRING2 its stiffness. This method is applied but the process is really tough and it meets covergence problems when the stiffness is nonlinear.
</p>
<ul><li>TENSION STIFFENING</li>
</ul><p>
ABAQUS MENUAL said tension stffening is suitable to model bond-slip in Smeared Plastical Model of concrete. It is really convinent to do this and the result is easy to get.
</p>
<p>
</p>
<p>
IF anyone of you are interested in this problem, it is welcome to discuss.
</p>
<p>
Thank you in advance!
</p>
</div></div></div><div class="field field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above"><div class="field-label">Forums: </div><div class="field-items"><div class="field-item even"><a href="/forum/109">Ask iMechanica</a></div></div></div><div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-above"><div class="field-label">Free Tags: </div><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/3866">REINFORCEMENT</a></div><div class="field-item even"><a href="/taxonomy/term/4551">RC beam</a></div><div class="field-item odd"><a href="/taxonomy/term/4552">bond-slip</a></div><div class="field-item even"><a href="/taxonomy/term/4553">spring elements</a></div><div class="field-item odd"><a href="/taxonomy/term/4554">tension stiffening</a></div></div></div>Sat, 21 Nov 2009 16:12:38 +0000siu7126 at https://imechanica.orghttps://imechanica.org/node/7126#commentshttps://imechanica.org/crss/node/7126traditional concrete model VS damage concrete model
https://imechanica.org/node/5993
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/77">opinion</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/4135">smeared cracking approach</a></div><div class="field-item even"><a href="/taxonomy/term/4136">damage model</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
In my opioion, the traditional concrete model is taking the smeared cracking concept to deal with the tensile cracking and using the elastoplastic method to deal with the compressive softening.
</p>
<p>
We can find that recently the CDM based concrete model become a hot research subject.
</p>
<p>
But what are the advantages of the CDM-based?
</p>
<p>
Thank you very much!
</p>
</div></div></div>Wed, 08 Jul 2009 13:53:39 +0000NewerLi5993 at https://imechanica.orghttps://imechanica.org/node/5993#commentshttps://imechanica.org/crss/node/5993Effect of aggregate (coarse aggregate) size on conpressive strength of concrete
https://imechanica.org/node/5091
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2277">strength</a></div><div class="field-item odd"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item even"><a href="/taxonomy/term/3679">coarse aggregate</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hi,
</p>
<p>
I want to know what is the effect of coarse aggregate size or size of the aggregate on compressive strength of concrete.And similarly what is effect of aggregate size on tensile strength of concrete.
</p>
<p>
I have few papers which contradicts each other so I am confused.
</p>
<p>
With Warm Regards
</p>
<p>
Gouse
</p>
</div></div></div>Thu, 19 Mar 2009 15:45:52 +0000Gouse5091 at https://imechanica.orghttps://imechanica.org/node/5091#commentshttps://imechanica.org/crss/node/5091Error | iMechanica