Acoustic Emission Characteristics of Microbe Cement Under Uniaxial Compression

Abstract

Microbial induced calcite precipitation (MICP) is an improved technology that uses microbial mineralization to strengthen soil or structure. The MICP method is rich in raw materials, low in price, and more environmentally friendly. The purpose of this study is to evaluate the strength behavior of microbe cement at different levels of cementation and to provide insight into the MICP treatment mechanism. Combined with acoustic emission monitoring technology, a series of uniaxial compression tests are carried out to study the failure mechanism of microbe cement. The experiment results show that the strength of microbe cement depends largely on the cementation level, the unconfined compressive strength increase obviously with the increase of grouting times, and the maximum uniaxial compressive strength of microbe cement can reach 10.1 Mpa. The RA-AF value can be used to analyze the fracture mode of microbe cement. Microbe cement has both tensile failure and shear failure, and tensile failure is the main failure of samples. The microstructure of microbe cement is observed by scanning electron microscope (SEM).