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Experiments on and predictions about properties of sand bonded by microbe cement

Science China(Technological Sciences) 2016年第8期59卷 1186-1193页

作者： QIAN ChunXiang RONG Hui YU XiaoNiu WANG Xin School of Materials Science and Engineering Southeast University Nanjing 211189 China Research Institute of Green Construction Materials Southeast University Nanjing 211189 China

microbe cement as a new bonding material is presented. Sandstone （0.05 m diameter, 0.5 m height） and sandpile （0.125 m^3） are joined by microbe cement to make a whole body. Evolutions in the related properties of treated sand samples are examined through compressive strength and calcite content. Results indicate that the structure of the cemented body is nonuniform, that the calcite content decreases with distance from the injection port, and that the compressive strength also decreases with dis- tance from the injection port. In addition, evolutions in the measured calcite content and compressive strength are summarized by a numerical model that considers microbe concentration distribution. The numerical results of the calcite content at different positions for 0.5 m height sandstone are similar to the test results, and the experimental results for calcite content and compres- sive strength of 0.125 m^3 cubic sandpile are similar to the numerical results. Prediction results indicate that the simulations should become a significant supplementary tool when microbe cement is applied in actual engineering projects.

关键词： microbe cement compressive strength calcite numerical model

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Microstructure Evolution of Sandstone cemented by microbe cement Using X-ray Computed Tomography

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Journal of Wuhan University of Technology(Materials Science) 2013年第6期28卷 1134-1139页

作者： RONG Hui QIAN Chunxiang School of Materials Science and Engineering Southeast University Jiangsu Key Laboratory of Construction Material Research Institute of Green Construction Materials Southeast University

The bio-sandstone, which was cemented by microbe cement, was firstly prepared, and then the microstructure evolution process was studied by X-ray computed tomography （X-CT） technique. The experimental results indicate that the microstructure of bio-sandstone becomes dense with the development of age. The evolution of inner structure at different positions is different due to the different contents of microbial induced precipitation calcite. Besides, the increase rate of microbial induced precipitation calcite gradually decreases because of the reduction of microbe absorption content with the decreasing pore size in bio-sandstone.

关键词： microbe cement bio-sandstone microstructure evolution x-ray computed tomography calcite

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Mechanism of MSWI Fly Ash Solidified by microbe cement

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Journal of Shanghai Jiaotong university(Science) 2020年第4期25卷 519-525页

作者： RONG Hui WEI Guanqi QIAN Chunxiang ZHANG Lei ZHANG Ying XU Rui School of Materials Science and Engineering Tianjin Chengjian UniversityTianjin 300384China State Key Laboratory of High Performance Civil Engineering Materials Nanjing 210008China School of Materials Science and Engineering Southeast UniversityNanjing 211189China Engineering Research Centre of Construction Waste and Coal Waste Recycle Technology of Tianjin Tianjin 300384China Tianjin Key Laboratory of Civil Structure Protection and Reinforcement Tianjin 300384China

microbe cement,a new type of gelling material,has attracted wide attention due to the increasing awareness of environmental *** this paper,the microbe cement in solidifying municipal solid waste incineration(MSWI)fly ash is investigated and the effect of the microbial induction method in solidifying MSWI fly ash is compared with the traditional chemical reaction strategy by characterizing the resulted calcite and the solidification productions with electronic universal testing machine,X-ray diffractometer(XRD),Fourier transform infrared spectrometer(FTIR),scanning electron microscope(SEM)and atomic absorption *** results show that the MSWI fly ash solidified by microbe cement has the highest compressive strength while that of the chemical CaCO3 products is the *** XRD results show that a new hydration gelling substance(Ca2SiO4·0.30H2O)is generated in the MSWI fly ash *** FTIR results show that the frequency of Si-O bonds and C-O bonds in the products solidified by microbe cement has shifted,while there is no change occurred in the chemical CaCO3 *** SEM results show that the microstructure of the products solidified by microbe cement is denser than that of chemical CaCO3 *** test results of heavy metals show that the microbe cement could reduce the leaching concentration of heavy metals in MSWI fly ***,the leaching concentration of Pb meets the standard requirements,while that of Cd is still slightly higher than the standard requirement.

关键词： microbe cement municipal solid waste incineration(MSWI) fly ash solidification mechanism

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Development of microbe cementitious Material in China

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Journal of Shanghai Jiaotong university(Science) 2012年第3期17卷 350-355页

作者：荣辉钱春香 School of Materials Science and Engineering Southeast University

microbe cementitious material as a binder has been developed due to the ever increasing awareness of environmental *** new cementitious material relies on microbiologically induced precipitation of calcium carbonate to bind loose particles or repair surface defects and cracks of cement-based *** paper elaborates the research on loose sand particles cemented by microbe cement from three aspects:compressive strength,pore structure and *** addition,the research on restoration surface defects and cracks of cement-based material by microbe cement is introduced from two parameters:surface water absorption and compressive strength recover *** results show that microbe cementitious material can bind loose particles and repair surface defects or cracks of cement-based material.

关键词： microbe cement defects microstructure calcite cracks

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