Recent years have seen a lot of development in the field of self-healing materials. Our group at Delft University is working (for more than a decade) on development of self-healing concrete which uses bacterial spores embedded in the matrix to "heal" cracks. In recent years, the focus has shifted on development of numerical models as tools for development of these materials. The most recent publication (just published) can be viewed at: https://www.researchgate.net/publication/319697836_Bio-based_Self-heali…
Regards