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Cementation anisotropy associated with microbially induced calcium-carbonate precipitation and its treatment effect on calcareous and quartz sands
Highlights A novel method of Microbially Induced Calcium Carbonate Precipitation (MICP) was proposed to prepare sand specimens with cementation anisotropy. An insight was gained into the MICP-produced anisotropic cementation induced by gravity and surface conditions. A comparison was made between the distinct MICP treatment mechanisms in quartz and calcareous sands. Cementation anisotropy was found to have a substantial impact on the mechanical properties of bio-cemented sands.
Abstract Microbially induced calcium-carbonate precipitation (MICP) can help cement sand particles together and has emerged as a promising alternative to traditional ground-improvement treatments for granular soils. Owing to precipitation and absorption in different directions, MICP leads to anisotropic cementation. This study was aimed at examining the mechanism of cementation anisotropy and its treatment effect on two commonly used granular soils in geotechnical engineering: quartz sand and calcareous sand. A novel MICP technique was used to prepare bio-cemented sand specimens with different anisotropic patterns of cementation. Microscopic detection techniques were applied to examine the microstructure of the produced MICP cementation. The cementation in the vertical and horizontal directions was different, owing to gravity. The granular surface properties affected the content, morphology, and cement force of the bio-cements produced by MICP treatment. The results of unconfined compression strength experiments confirmed the occurrence of cementation anisotropy and its substantial effects on the stiffness, strength, and fracture patterns of MICP-treated quartz sand and calcareous sand. These findings can help to clarify the formation mechanism of bio-cements and promote the optimised application of MICP for the treatment of granular soils.
Cementation anisotropy associated with microbially induced calcium-carbonate precipitation and its treatment effect on calcareous and quartz sands
Highlights A novel method of Microbially Induced Calcium Carbonate Precipitation (MICP) was proposed to prepare sand specimens with cementation anisotropy. An insight was gained into the MICP-produced anisotropic cementation induced by gravity and surface conditions. A comparison was made between the distinct MICP treatment mechanisms in quartz and calcareous sands. Cementation anisotropy was found to have a substantial impact on the mechanical properties of bio-cemented sands.
Abstract Microbially induced calcium-carbonate precipitation (MICP) can help cement sand particles together and has emerged as a promising alternative to traditional ground-improvement treatments for granular soils. Owing to precipitation and absorption in different directions, MICP leads to anisotropic cementation. This study was aimed at examining the mechanism of cementation anisotropy and its treatment effect on two commonly used granular soils in geotechnical engineering: quartz sand and calcareous sand. A novel MICP technique was used to prepare bio-cemented sand specimens with different anisotropic patterns of cementation. Microscopic detection techniques were applied to examine the microstructure of the produced MICP cementation. The cementation in the vertical and horizontal directions was different, owing to gravity. The granular surface properties affected the content, morphology, and cement force of the bio-cements produced by MICP treatment. The results of unconfined compression strength experiments confirmed the occurrence of cementation anisotropy and its substantial effects on the stiffness, strength, and fracture patterns of MICP-treated quartz sand and calcareous sand. These findings can help to clarify the formation mechanism of bio-cements and promote the optimised application of MICP for the treatment of granular soils.
Cementation anisotropy associated with microbially induced calcium-carbonate precipitation and its treatment effect on calcareous and quartz sands
Zhang, Xing (author) / Zhou, Bo (author) / You, Lingyun (author) / Wu, Ziyang (author) / Wang, Huabin (author)
2023-06-19
Article (Journal)
Electronic Resource
English
Desert Aeolian Sand Cementation via Microbially Induced Carbonate Precipitation
| British Library Conference Proceedings | 2021
| British Library Conference Proceedings | 2022