CRACK REVIVES BACTERIA
Microcapsules with bacteria, calcium, and urea (for food) are scattered in the concrete. When the concrete cracks, and water seeps in, the capsules dissolve to release the bacteria.
BACTERIA CAUSE REACTION
The bacteria bind calcium on their surfaces and absorb urea, which their metabolisms split and liberate as carbonaceous carbonate. Calcium and carbonate react to produce calcium carbonate – lime.
LIME FILLS UP HOLES
As long as the bacteria get air and water, they will reproduce and produce lime. When the entire crack has been filled, the bacteria go back to hibernation. Hence, bio-concrete can save lots of maintenance costs.