With the increase of usage time, cracks may appear on the cement wall, which is not only troublesome to repair but also poses a safety hazard. Recently, microbiologist Yonke from Delft University of Technology in the Netherlands has invented a self repairing cement that can prevent cracks in cement walls.
It is reported that Yonker mixes bacteria, cement and calcium lactate living near active volcano. When the cement cracks, as long as rainwater enters the crack, it can "wake up" the bacteria. After they absorb calcium lactate, they will secrete limestone, which can repair the crack in an average of three weeks. It is reported that this bacterium can withstand high and low temperatures, and its dormancy period can last up to 200 years, which is enough to repair most of the cement exterior walls of buildings for a long time. The liquid containing this bacterium can be directly sprayed onto the cracked surface of the cement. Cement repair bacteria can work on cracks of any length, but the width cannot exceed 0.8 millimeters, otherwise the effect will be greatly reduced.
Yonke plans to launch this cement repair fluid this year and then launch repair cement next year.