Macroscopic and Microscopic Experimental Study on the Improvement of MICP for Sand Solidification Using Aluminum Chloride

PENG Jie; ZHU Qi; ZHANG Liyao; GUO Zihao; OUYANG Xintao; LUO Chenwei

doi:10.3724/j.gyjzG24103112

Volume 56 Issue 4

Apr. 2026

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PENG Jie, ZHU Qi, ZHANG Liyao, GUO Zihao, OUYANG Xintao, LUO Chenwei. Macroscopic and Microscopic Experimental Study on the Improvement of MICP for Sand Solidification Using Aluminum Chloride[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(4): 266-273. doi: 10.3724/j.gyjzG24103112

Citation:

PENG Jie, ZHU Qi, ZHANG Liyao, GUO Zihao, OUYANG Xintao, LUO Chenwei. Macroscopic and Microscopic Experimental Study on the Improvement of MICP for Sand Solidification Using Aluminum Chloride[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(4): 266-273. doi: 10.3724/j.gyjzG24103112

Citation:

PENG Jie, ZHU Qi, ZHANG Liyao, GUO Zihao, OUYANG Xintao, LUO Chenwei. Macroscopic and Microscopic Experimental Study on the Improvement of MICP for Sand Solidification Using Aluminum Chloride[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(4): 266-273. doi: 10.3724/j.gyjzG24103112

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Macroscopic and Microscopic Experimental Study on the Improvement of MICP for Sand Solidification Using Aluminum Chloride

doi: 10.3724/j.gyjzG24103112

Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China

Received Date: 2024-10-31
Available Online: 2026-06-06
Publish Date: 2026-04-20

Abstract

Abstract

In order to explore the optimization method of solidification performance using microbially induced calcium carbonate precipitation （MICP） technology， a study was conducted based on MICP combined with additive technology， using calcium acetate as the calcium source. The effect and micro-mechanism of aluminum chloride additive on the optimization of MICP solidification effect of sandy soil were studied through sand column test， aqueous solution tests， microscopic observation， and SEM analysis. The experimental results showed that with the increase of the concentration of aluminum chloride additive， the unconfined compressive strength and calcium carbonate production of the samples first increased and then decreased， and the optimal concentration was 6 mmol/L. At this concentration， the strength of the samples increased to 2.8-3.3 times that of the conventional group. Aluminum ions promoted the aggregation of calcium carbonate crystals into a compact structure and regulated the crystal growth rate， thereby improving the uniformity of reinforcement. When calcium acetate was used as the calcium source， calcium carbonate crystals coexisted in the form of lamellar rhombic calcite and needle-like aragonite. Aluminum ions promoted the transformation of metastable vaterite into more stable needle-like aragonite and enhanced the bonding between sand particles， thus optimizing the solidification effect of MICP.
- microbially induced calcium carbonate precipitation,
- aluminum chloride,
- calcium acetate,
- micro-mechanism,
- sand solidification

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References(37)

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