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...Introduction cracking in concrete is a main concern throughout the world because it cause loss of strength structure with time maintaince cracked require lot care and money environmental friendly solution prefered i e biological over other alternatives like epoxy resins which non degradable what bio special type invented by group microbiology researchers under head henk jonkers also called as bacterial or self healing its specially made to increase lifespan durability action that found there are two thing present bacteria has resist alkalinity mechanical stress chemical precursor activate used most belongs genus bacillus fulfilling required criteria discussed above some list b pseudofirmus cohnii fila etc suitable be calcium lactate working process cracks less than mm can auto fill but more then itself thus opening passage chemicals materials if water contact though get activated from stage dormancy formed further carbonate act material when completely again went future widen foreign p...