GGBS-MICP协同固化淤泥质砂土工程特性研究

doi:10.3724/1000-6915.jrme.2024.0570

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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.

Key words： soil mechanics ground granulated blast-furnace slag(GGBS) MICP compressive strength erosion resistance bio-CaCO3

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	Articles by authors
	WANG Dongxing1
	XU Fengli1
	PAN Xiaohua2
	SHANG Wufeng3
	WU Zhangping4
	GUO Kecheng5

Cite this article:

WANG Dongxing1,XU Fengli1,PAN Xiaohua2, et al. Study on the engineering properties of GGBS-MICP synergistic solidification of silty-sandy soil[J]. , 2025, 44(5): 1349-1362.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0570 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I5/1349

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