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Calcium carbonate precipitation, caused by the metabolic activity of bacteria, is a good idea to improve concrete performance. This study was aimed at investigating the effect on using bacteria for healing the cracks and improving the concrete properties by introducing effective parameters in this field. Because knowing these parameters, it can help fill existing gaps and in achieving high-quality bacterial concrete in future studies. The effects of the type of the bacteria, the nutrients, the concentration of the bacteria, and methods of introducing bacteria in concrete were also studied. By reducing the structural pores, the bacterial participation at the concentration of 10 5 –10 7  cells/ml has led to an increase in the compressive strength by up to 42.5% and a decrease in the penetration of chloride by up to 69%. Moreover, the evaluated efficiency of the crack healing by encapsulation was higher in this method than the other methods.

Review of the potential application of bacteria in self-healing and the improving properties of concrete/mortar