Effect of fiber type and content on mechanical properties of microbial solidified sand

Fibers are applied to construction works improve the strength and brittle failure of soil. In this paper, fibers with a length 6 mm added microbial cemented sand, fiber types content research variable. Unconfined compressive (UCS), permeability coefficient, water absorption rate, dry density, calcium carbonate precipitation solidified sand were tested. The physical mechanical properties on immobilization microorganisms also analyzed from micro–macro perspective. Results presented as follows. UCS Microbial induced (MICP) treated increases first then decreases increasing content. This phenomenon is due promotion by short reinforcement, limited movement particles caused formed network between fibers, enhanced sand. However, agglomeration additional leads uneven distribution reduction in strength. optimum contents polypropylene, glass, polyvinyl alcohol, basalt 0.4%, 0.2%, 0.1%, respectively.