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This Self-healing Concrete Repairs Itself with Bacteria

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Concrete cracks for many reasons: just for starters, the heating and cooling of changing seasons make it expand and contract, and the stress produced as the freshly poured goo dries and shrinks in volume, pulling against its underlying metal supports, can also cause cracks. But Dutch researchers are testing a new way to deal with the problem of cracking concrete: bacteria that, when exposed to water, form limestone.

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