CRACK REPAIR AND SURFACE DEPOSITION OF CEMENT-BASED MATERIALS BY MICP TECHNOLOGY

It was reviewed the state-of-art of microbially induced calcium carbonate precipitation ( MICP) technology for cracks repair and surface deposition of cement-based materials． The bacteria ( Sporosarcina pasteurii) and nutrient solution with three types of calcium sources were used to remedy the cracks with the width of 0. 2 to 0. 4 mm in the pie-shaped cement mortar samples by daubing bacteria and injecting nutrient salts，whose average flexural strength after treatment was about 200 kPa; a deposition was made on the surface of the cement mortar block by brushing bacteria and nutrient solution，whose water absorption was decreased by about 10%． The test results showed that the different calcium sources had the same effect on the flexural strength and water absorption．