BacillaFilla could be the next big building material -- it's said to repair cracked concrete in an eco-friendly way and thus extend the life of concrete structures. It's made from bacteria commonly found in soil that has been genetically modified to react to concrete's pH. As the bacteria grows, three cell types are formed. "One type produces crystals of calcium carbonate; one develops filament-like cells that serve as reinforcing fibers, and the third produces glue that acts as a binding agent and fills the gap," explains Korky Koroluk. "Ultimately, the repair cures to the same strength as the surrounding concrete."
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