As they grow, they’ll work as a catalyst within the calcium-rich conditions of the concrete to promote precipitation of calcium carbonate crystals. These mineral deposits can fill in the cracks.
Pure calcium carbonate is not as strong as concrete. It sounds like this will just fill in cracks with weaker material, hiding them from inspection, which would be even worse --- the strength of the material is degrading but not visibly.
Pure calcium carbonate is not as strong as concrete. It sounds like this will just fill in cracks with weaker material, hiding them from inspection, which would be even worse --- the strength of the material is degrading but not visibly.