American scientists from Drexel University in Pennsylvania managed to increase the durability of concrete by strengthening it with live microorganisms. The study was published in the scientific journal magazine Construction and Building Materials (CBM).
Experts used a bacteria-rich hydrogel and a special polymer fiber encased in a durable protective shell.
According to the researchers, this type of microbial “reinforcement” prevents cracks from growing and allows damaged material to regenerate.
The scientific team isolated the bacterial strain Lysinibacillus sphaericus as a bioremediation agent. These resistant microorganisms are often found in soil. They have the ability to trigger a biological process called microbial calcium carbonate precipitation, creating a rock-like material that can stabilize and harden into a patch for open cracks in concrete.
Lysinibacillus sphaericus can survive the harsh conditions inside concrete and remains dormant until activated by moisture. When water enters a crack, it causes the hydrogel to expand and squeeze out of its shell towards the crack. Bacteria also take action and react with the calcium in the concrete to form calcium carbonate, which fills the crack to the surface. The authors of the discovery noted that on average the microbes managed to recover within one to two days.
Previous scientists was created Material for bone regeneration.
Source: Gazeta
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