A material science professor at TU Delft [1] and this material is commercially available [2]. From the abstract of `Bacteria-Based Self-Healing Cementitious Co

A material science professor at TU Delft [1] and this material is commercially available [2]. From the abstract of `Bacteria-Based Self-Healing Cementitious Composite for Application in Low-Temperature Marine Environments` [3]: "The composite displayed an excellent crack-healing capacity, reducing the permeability of cracks 0.4 mm wide by 95%, and cracks 0.6 mm wide by 93% following 56 days of submersion in artificial seawater at 8 ◦C. Healing of the cracks was attributed to autogenous precipitation, autonomous bead swelling, magnesium-based mineral precipitation, and bacteria-induced calcium-based mineral precipitation in and on the surface of the bacteria-based beads. " [1] https://www.tudelft.nl/citg/over-faculteit/afdelingen/materials-mechanics-management-design-3md/sections-labs/materials-environment/staff/dr-hm-henk-jonkers/ https://www.tudelft.nl/citg/over-faculteit/afdelingen/materi... [2] https://www.basiliskconcrete.com/hoe-werkt-het/?lang=en https://www.basiliskconcrete.com/hoe-werkt-het/?lang=en [3] doi:10.3390/biomimetics2030013