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Physical-mechanical properties of microbially induced calcite precipitation-treated loess and treatment mechanism

Journal of Mountain Science 2022年第10期19卷 2952-2967页

作者： ZHANG Hao-nan JIA Cang-qin WANG Gui-he SU Fei SUN Yong-shuai FAN Chang-yi School of Engineering and Technology China University of Geosciences(Beijing)Beijing 100083China China Institute of Nuclear Industry Strategy Beijing 100822China College of Water Resources&Civil Engineering China Agricultural UniversityBeijing 100091China

Loess disintegration can lead to geotechnical engineering problems,e.g.,slope erosion,wetting-induced landslide,and *** induced calcite precipitation(MICP)technique is a potential loess reinforcing *** study investigated the physical-mechanical properties of MICP-treated loess and then explored the mechanism of loess modification by ***,loess first underwent MICP treatment,i.e.,mixing loess with Sporosarcina pasteurii and cementation solution(CS).Then,the effects of the CS concentration(0.2,0.6,0.8,and 1 M)on the physical and mechanical properties of the MICP-treated loess were ***,the static contact angle test,scanning electron microscopy(SEM),and X-ray diffractometry(XRD)were conducted to study the mechanism of MICP treatment on *** showed the following property changes of loess after MICP treatment:the liquid limit decreased by 1.7%,the average particle size increased from 6 to 47μm,the specific gravity decreased from 2.65 to 2.43,the unconfined compressive strength increased from 37 to 71 k Pa,and the disintegration time increased from 10 to 25 ***,the shear strength also increased,and the shear strength parameters(cohesion c and internal friction angle?)varied with the CS *** static contact angle tests indicated that the water absorption ability of loess was reduced after MICP *** and XRD results verified that the CaCO_(3)from MICP was attributed to the above *** above findings explained the mechanism of MICP treatment of loess:the CaCO_(3)coats and cements the particles,and fills the pores of loess,improving the strength and water stability of loess.

关键词： microbially induced calcite precipitation Loess Physical-mechanical properties Strength improvement Disintegration mitigation Modification mechanism

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Strength-increase mechanism and microstructural characteristics of a biotreated geomaterial

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Frontiers of Structural and Civil Engineering 2020年第3期14卷 599-608页

作者： Chi LI Siriguleng BAI Tuanjie ZHOU Hanlong LIU Xiao QIN Shihui LIU Xiaoying LIU Yang XIAO College of Civil Engineering Inner Mongolia University of TechnologyHohhot 010051China College of Science Inner Mongolia University of TechnologyHohhot 010051China College of Civil Engineering Chongqing UniversityChongqing 400045China

microbially induced calcite precipitation(MICP)is a recently proposed method that is environmentally friendly and has considerable potential applications in artificial biotreated *** artificial biotreated geomaterials are produced based on the MICP technology for different parent *** purpose of this study is to explore the strength-increase mechanism and microstmctural characteristics of the biotreated geomaterial through a series of *** results show that longer mineralization time results in higher-strength biotreated *** strength growth rate rapidly increases in the beginning and remains stable *** calcium ion content significantly increases with the extended mineralization *** standard sand was used as a parent soil,the calcium ion content increased to a factor of 39 after 7 *** bacterial cells with attached calcium ions serve as the nucleus of crystallization and fill the pore *** fine sand was used as a parent soil,the calcium ion content increased to only a factor of 7 after 7 days of *** nucleus of crystallization could not normally grow because of the limited pore *** porosity and variation in porosity are clearly affected by the parent ***,the strength of the biotreated geomaterial is affected by the parent soil properties,mineralization time,and granular material pore *** paper provides a basis for theory and experiments for biotreated geomaterials in future engineering practice.

关键词： biotreated geomaterial microbially induced calcite precipitation strength-increase mechanism microstructural characteristics

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Rock-like behavior of biocemented sand treated under non-sterile environment and various treatment conditions

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第3期13卷 705-716页

作者： Meghna Sharma Neelima Satyam Krishna RReddy Discipline of Civil Engineering Indian Institute of Technology IndoreIndore453552India Department of Civil Materialsand Environmental EngineeringUniversity of Illinois at ChicagoChicagoILUSA

microbially induced calcite precipitation(MICP)is a recently developed technique for microbiological ground improvement that has been applied for mitigating various geotechnical ***,the major challenges,such as calcite precipitation uniformity,presence of different bacteria,cementation solution optimization for cost reduction,and implementation under non-sterile and uncontrolled field environment are still not fully explored and require detailed investigation before field *** study aims to address these challenges of MICP to improve the geotechnical properties of sandy *** series of experiments were conducted using poorly graded Narmada River(India)sand,which were subjected to various biotreatment schemes and tested for unconfined compressive strength(UCS),split tensile strength(STS),ultrasonic pulse velocity(UPV),hydraulic conductivity(after 6 d,12 d,and 18 d of treatment),and calcite *** microstructure of sand was examined through a scanning electron microscope(SEM).Initially,the sand was individually augmented with two non-pathogenic bacterial strains,***(S.)pasteurii and Bacillus(B.)*** stopped-flow injection method was adopted to provide cementation solutions at three different durations(treatment cycle)of 12 h,24 h,and 48 h and three different pore volumes(PVs)of 1,0.75,and *** pore volume here refers to the porosity which is expressed as a ratio,i.e.a porosity of 50%was used as *** results showed rock-like behaviors of biocemented sand with the UCS,STS,and UPV enhancement up to 2333 kPa,437 kPa,and 2670 m/s,*** hydraulic conductivity reduction of 96.6%was achieved by 12%of calcite formation after 18 d of treatment using Sporosarcina pasteurii,12-h treatment cycle,and one pore volume of cementation media in each ***,a 24-h treatment cycle and 0.5-pore volume cementation solution were found to be the optimal treatment which was effective and economical to achiev

关键词： Bacteria microbially induced calcite precipitation (MICP) Soil stabilization Microstructure calcite content

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