Dutch scientists from Delft University are testing concrete, capable of self-repair.
A special feature of self-healing concrete is that cracks in it are sealed with special bacteria.
In the process of making this material, special granules are added to it. These pellets are filled with microbial spores and granulated calcium lactate. Calcium lactate is the “food” for the bacteria. As a result of its processing we get calcite, which is used to fill cracks and crevices in this type of concrete.
To activate the “healing” process, all it takes is a little moisture getting into the cracks. Before that the bacterial spores are “asleep”. These microorganisms can survive for several years in their dormant state.
During the laboratory tests it was proved that bacteria can seal concrete cracks with calcite. Both microcracks and large cracks can be repaired. But if it gets wet outdoors, there is a high risk that freezing could cause further damage to the material.
Now the authors of the technology are trying to confirm its effectiveness outside the laboratory. They claim it will take 2 to 3 years to test.
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