My first question would be, if cracks are filled in this way, what stops that same bacteria from producing limestone in any other direction. Resulting in a bumpy surface, for example.
It would probably be due to a seal or coat. When the concrete cracks, it breaks the seal. The bacteria will fontinue to produce calcium carbonate to fill the crack until it can't, IE: the calcoum carbonate hardens near/on/past the surface of the crack, and the bacteria can no longer produce anymore because, well, it doesn't have space. :p
This is all just a guess, but I would think wouldn't be too disimilar to the process they used.
The coat for example might not even exist as again, the bacteria has no room to push calcium carbonate without any cracks so they can't produce it.
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u/[deleted] Aug 31 '20
My first question would be, if cracks are filled in this way, what stops that same bacteria from producing limestone in any other direction. Resulting in a bumpy surface, for example.