Study on the engineering properties of GGBS-MICP synergistic solidification of silty-sandy soil
WANG Dongxing1，XU Fengli1，PAN Xiaohua2，SHANG Wufeng3，WU Zhangping4，GUO Kecheng5
(1. School of Civil Engineering，Wuhan University，Wuhan，Hubei 430072，China；2. School of Earth Sciences and Engineering，Nanjing University，Nanjing，Jiangsu 210023，China；3. General Contracting Company，CRCC Harbour and Channel Engineering Bureau Group，Zhuhai，Guangdong 519000，China；4. Hubei Tianyou Bocheng Construction
Engineering Co.，Ltd.，Wuhan，Hubei 430061，China；5. Wuhan Qiancheng Piling
Technology Co.，Ltd.，Wuhan，Hubei 430062，China)
Abstract：To facilitate the reutilization of solid waste and the solidification of soil，this study integrates ground granulated blast-furnace slag(GGBS) with microbial induced carbonate precipitation(MICP) technology，referred to as GGBS-MICP. It aims to investigate the engineering properties of silty-sandy specimens solidified with various particle sizes and dosages of GGBS combined with MICP technology through a series of tests，including unconfined compressive strength(UCS)，triaxial compression，erosion resistance，Ca2+ utilization quantity，pH values，and scanning electron microscopy(SEM). Compared to silty-sandy specimens treated solely with GGBS and MICP，those solidified by GGBS-MICP exhibit a significantly increased UCS. Finer GGBS particles yield a more pronounced enhancement，especially with＜10 GGBS-MICP. For ＜10 GGBS-MICP solidified silty-sandy samples with/without ，the peak values of effective bonding strength c? and internal friction angle occur at 1% and 3% GGBS dosages，respectively. Adequate effectively enhances the erosion resistance of GGBS-MICP solidified samples against the saline solutions，and the erosion resistance follows the sequence：water＞1%Na2SO4＞1%NaCl. SEM analysis reveals a denser C-S-H gel structure in GGBS-MICP samples，with GGBS being capable of regulating the crystal morphology of bio-CaCO3，where the crystal growth of vaterite predominates over that of calcite and aragonite. The difference in pH values(ΔpH) between＜10 GGBS-MICP and original GGBS-MICP solidified silty-sandy samples indicates that ΔpH1 without Ca2+ is greater than ΔpH2 with . The increase in utilization quantity with increasing GGBS dosages in GGBS-MICP(with ) samples highlights the importance of sufficient calcium sources for the effective solidification using GGBS-MICP technology. Therefore，the adoption of＜10 3%GGBS-MICP(with ) solidification approach greatly enhances the engineering properties of silty-sandy soil，achieving the efficient utilization of solid waste，and aligning with the strategies of green and sustainable development.
王东星1，许凤丽1，泮晓华2，商武锋3，吴章平4，郭克诚5. GGBS-MICP协同固化淤泥质砂土工程特性研究[J]. 岩石力学与工程学报, 2025, 44(5): 1349-1362.
WANG Dongxing1，XU Fengli1，PAN Xiaohua2，SHANG Wufeng3，WU Zhangping4，GUO Kecheng5. Study on the engineering properties of GGBS-MICP synergistic solidification of silty-sandy soil. , 2025, 44(5): 1349-1362.
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2025, Vol. 44 
