STUDY ON THE CAPABILITY OF FIBER-REINFORCED CEMENTED SAND BASED ON BOX-BEHNKEN MODEL

In fiber-reinforced cemented sand, bonding between the fibers and intermediate matrix shows lots of important properties, which includes the strength, the actual fracture energy, and energy absorption capacity. In this paper, synthesis of green and environment friendly fiber-reinforced cemented sand on ecological perspective and expands the range of an advanced process of microbially induced calcite precipitation (MICP) to pretreat polypropylene (PP) fibers surface in order to increase the boning strength is studied. MICP process is used to generate calcium carbonate that combined with the fiber surface, which can increase interfacial bond area and strength. It is indicated that as the number of treatments increases, the effect of fiber reinforcement on the strength of the sample decreases. The results show that the peak intensity of the Bio-FS sample is higher when the fiber length is shorter. The peak intensity of the Bio-FS sample increased with increasing fiber content over the range of fiber content. The peak intensities of Bio-FS at different relative densities reveals that the samples have high strength when the relative densities are higher and lower. Results acknowledged a significant role of MICP pretreatment in enhancing the corresponding mechanical performance.