Abstract: Reinforcing coarse-grained soils using the enzyme-induced carbonate precipitation (EICP) technique has a relatively low efficiency. To enhance its effectiveness, a green organic material—glutinous rice slurry—was introduced in this study to reinforce sand in combination with EICP. Unconfined compressive strength (UCS) tests were conducted on sand reinforced using the combined glutinous rice slurry and EICP me-thod (G-EICP). Combined with microstructural analyses (SEM, XRD, FTIR, and Micro-CT), the effects of glutinous rice slurry concentration, volumetric ratio, and soil relative density on the reinforcement efficacy were systematically investigated, and the reinforcement mechanism was elucidated. The results demonstrate that the strength of the G-EICP reinforced soil is maximized at a glutinous rice slurry concentration of 12%. The strength initially increases and subsequently decreases with increasing volumetric ratio of glutinous rice slurry, peaking at a volumetric ratio of 15%. Although glutinous rice slurry did not alter the crystalline form or quantity of calcium carbonate produced, the hydroxyl groups in its amy-lopectin component provided nucleation sites, thereby improving the reinforcement efficiency. Pore structure analysis revealed that the overall soil porosity decreased with increasing glutinous rice slurry volumetric ratio. The formation of weak planes and a reduction in strength occurred when the ratio exceeded 15%, resulting in pore uniformity and fractal dimension declining. The reinforcement mechanism of the G-EICP technique can be summarized into three synergistic modes, multiphase composite cementation, hierarchical optimized bridging, and surface modification coa-ting.
王剑烨, 李肖, 张进, 鲁爽, 彭丽云, 王冬勇. 糯米浆-脲酶诱导碳酸钙联合加固砂土强度研究[J]. 材料导报, 2026, 40(5): 25040239-7.
WANG Jianye, LI Xiao, ZHANG Jin, LU Shuang, PENG Liyun, WANG Dongyong. Study on the Strength Behavior of Sandy Soil Reinforced by Glutinous Rice Slurry Combined with Enzyme-induced Calcium Carbonate Precipitation. Materials Reports, 2026, 40(5): 25040239-7.
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2026, Vol. 40 
