Kaolin-nucleation-based biotreated calcareous sand through unsaturated percolation method

Ma, Guoliang; Xiao, Yang; He, Xiang; Li, Jun; Chu, Jian; Liu, Hanlong

doi:10.1007/s11440-022-01459-y

Cited by 24 publications

(2 citation statements)

References 49 publications

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“…Microbiologically induced calcium carbonate precipitation (MICP) is a new microbial reinforcement technique in geotechnical engineering (DeJong et al 2006;Whiffin et al 2007;DeJong et al 2010;Harkes et al 2010;Al Qabany et al 2012;Chu et al 2012;Al Qabany and Soga 2013;He et al 2020;Ma et al 2022) and has been regarded as a green reinforcement technique with broad prospects (Whiffin et al 2007;DeJong et al 2010;Consoli et al 2012;DeJong et al 2013;Rahmannejad and Toufigh 2018;Irani and Ghasemi 2021;Xiao et al 2022b). The urease-producing bacteria are widely used as the active bacteria in the MICP technique, and the biochemical reaction process is summarized as follows (Whiffin et al 2007;Mortensen et al 2011;Zhao et al 2014;Cheng et al 2019): NH 2 -CO-NH 2 + 2H 2 O → 2NH 4 + + CO 3 2− , and Ca 2+ + CO 3 2− → CaCO 3 ↓.…”

Section: Introductionmentioning

confidence: 99%

Fracture of Interparticle MICP Bonds under Compression

Xiao

et al. 2023

Int. J. Geomech.

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Microbiologically induced calcium carbonate precipitation (MICP), as a promising reinforcement technique, has been investigated extensively through element and model tests. However, tests on the particle-scale behaviors of MICP bonds are rarely conducted yet, which constrains the development of constitutive and numerical models of MICP-treated sands. In this paper, a set of devices is designed to form MICP bonds between spherical quartz beads (SQBs) and spherical calcareous beads (SCBs) and investigate the microscopic compression behavior of the interparticle MICP bonds in comparison with portland cement (PC) bonds. The experimental results reveal that the PC bonds are the strongest, whereas the MICP bonds between SQB are the weakest. A higher cementation degree leads to higher strength and smaller dispersion among parallel specimens, while a larger interparticle distance causes smaller strength and greater dispersion. Identified with force-displacement curves and optical photos, the PC-treated SQB specimens are dominated by brittle failure, the MICP-treated SQB specimens can present ductile or brittle failure, and possible grain crushing is observed in the MICP-treated SCB specimens. Scanning electron microscopy (SEM) images suggest better interfacial bonding for the MICP-treated SCB specimens than for the MICP-treated SQB specimens. Gravity-related inhomogeneity is observed in the MICP bonds, whereas a homogeneous dense microstructure is observed in the PC bonds.

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Section: Introductionmentioning

confidence: 99%

Fracture of Interparticle MICP Bonds under Compression

Xiao

et al. 2023

Int. J. Geomech.

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“…However, for fine soils, for example, calcareous silt, the biocementation could hardly be achieved due to the difficulties of grouting with a few cycles (Ma et al, 2022). Besides, calcareous silt is always with high calcium carbonate content.…”

Section: Introductionmentioning

confidence: 99%