Mechanical Properties and Mechanism of MICP Enhanced Cement Modified Red Mudstone Filler
XIAO Yao, DENG Huafeng*, CHENG Lei, HUANG Xiaoyun, LI Jianlin
Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education, China Three Gorges University, Yichang 443002, Hubei, China
Abstract: The high-speed railway inevitably passes through the areas with red mudstone layer, which is of poor engineering properties. A study was conducted on microbial induced carbonate precipitation (MICP) technique to enhance the performance of red mudstone roadbed filler by using self-extracted Bacillus cereus. By comparing the physical and mechanical indicators of the samples before and after improvement using MICP technique, the enhancement effect was analyzed, and the synergistic enhancement mechanism of cement and MICP was explored from a microstructure perspective. The results showed that, compared with the cement modified soil samples, the unconfined compressive strength of the cement-microbial modified soil samples increased by 12.31%—14.25%, the permeability coefficient decreased by 6.06%—34.06%, and the unloaded expansion rate decreased to 0.52%—0.65%. The addition of microorganisms significantly improves the mechanical strength, impermeability, and expansion resistance of cement modified soil samples. Cement hydration reaction and microbial mineralization reaction are carried out simultaneously and promote each other. Under the combined effects of both, more calcium carbonate crystals and hydrated calcium silicate (C-S-H) gel and other cementitious substances are generated to fill the pores between soil particles and cement adjacent soil particles, minimizing the pore size, reducing the number of filled pores, and increasing the contact points between particles. In this way, the adjacent particles are cemented more closely, thereby improving the internal pore structure of the sample, enhancing the cementation performance between particles, and thus improving the physical and mechanical properties of red mudstone filler. The expected research results can provide reference for the engineering application of microbial enhanced cement soil technology.
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2025, Vol. 39 
