Experimental study on improving hydraulic characteristics of sand via microbially induced calcium carbonate precipitation

Guo, Liang; Wang, Baoquan; Guo, Jiayi; Guo, Hao; Jiang, Yuhong; Zhang, Min; Dai, Qichen

doi:10.1016/j.gete.2023.100519

Cited by 4 publications

(3 citation statements)

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“…The original image was partially blurred owing to the height difference between the sand particles. To avoid a misleading analysis in this area, the original image was stacked [ 75 ]. The results can intuitively distinguish three phases (particles, pores, and CaCO 3 ) but cannot obtain quantitative data.…”

Section: Results and Analysismentioning

confidence: 99%

“…Because of biocementation, the flow channel and part of the pore throats between particles were blocked, therefore, the data showed the most obvious low permeability phenomenon [ 75 ]. It was concluded that the key pore throats were blocked by a large amount of high-efficiency CaCO 3 precipitation between the particles; that is, the optimal precipitation amount was used to achieve anti-seepage and water resistance.…”

Section: Results and Analysismentioning

confidence: 99%

“…In contrast, inter-particle cementation (G-G and G-C patterns in images), followed by pore throat blockage, which was caused by high strength and weak blockage. The data showed high permeability coefficient and high porosity [ 75 ].…”

Section: Results and Analysismentioning

confidence: 99%

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Identification and extraction of cementation patterns in sand modified by MICP: New insights at the pore scale

Wang,

Guo,

Luo

et al. 2024

PLoS ONE

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Microbially induced calcium carbonate precipitation (MICP) is an environmentally friendly technology that improves soil permeability resistance through biocementation. In this study, 2D microscopic analysis and 3D volume reconstruction were performed on river sand after 24 cycles of bio-treatment based on stacked images and computed tomography (CT) scanning data, respectively, to extract biocementation patterns between particles. Based on the mutual validation findings of the two techniques, three patterns in the biocemented sand were identified as G-C-G, G-C, and G-G. Specifically, 2D microscopic analysis showed that G-C-G featured multi-particle encapsulation and bridging, with a pore filling ratio of 81.2%; G-C was characterized by locally coated particle layers, with a pore filling ratio of 19.7%; and the G-G was marked by sporadic filling of interparticle pores, with a pore filling ratio of 11.7%. G-C-G had the best cementation effect and permeability resistance (effective sealing rate of 68.5%), whereas G-C (effective sealing rate of 2.4%) had a relatively minor contribution to pore-filling and flow sealing. 3D volume reconstruction showed that G-C-G had the highest pore filling rate, followed by G-G and G-C. The average filling ratios of area and volume for G-C-G were 83.979% and 77.257%, respectively; for G-G 20.360% and 23.600%; and for G-C 11.545% and 11.250%. The analysis of the representative element volume (REV) was conducted, and the feasibility and reliability of the micro-scale pattern extraction results were confirmed to guide the analysis of macro-scale characteristics. The exploration of the effectiveness of cementation patterns in fluid sealing provides valuable insights into effective biocementation at the pore scale of porous media, which may inspire future research.

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Section: Results and Analysismentioning

confidence: 99%

Section: Results and Analysismentioning

confidence: 99%