Cementation of Loose Sand Particles based on Bio-cement  

作　　者：荣辉 钱春香 

机构地区：[1]School of Materials Science and Engineering, Southeast University [2]School of Materials Science and Engineering, Tianjin Chengjian University

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2014年第6期1208-1212,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.51072035);the Ph D Program’s Foundation of Ministry of Education of China(No.20090092110029);the Research Innovation Program for College Graduates of Jiangsu Province(No.CXZZ_0145);the Scientific Research Foundation of Graduate School of Southeast University(Nos.YBJJ1127 and YBPY1208);the Ph D Program’s Foundation Funded by the Science and Technology Review(kjdb2011001)

摘　　要：Loose sand particles could be cemented to sandstone by bio-cement（microbial induced magnesium carbonate）. The bio-sandstone was firstly prepared, and then the compressive strength and the porosity of the sandstone cemented by microbial induced magnesium carbonate were tested to characterize the cementation effectiveness. In addition, the formed mineral composition and the microstructure of bio-sandstone were analyzed by X-ray diffraction（XRD） and scanning electron microscopy（SEM）, respectively. The experimental results show that the feasibility of binding loose sand particles using microbial induced magnesium carbonate precipitation is available and the acquired compressive strength of bio-sandstone can be excellent at certain ages. Moreover, the compressive strength and the porosity could be improved with the increase of microbial induced magnesium carbonate content. XRD results indicate that the morphology of magnesium carbonate induced by microbe appears as needles and SEM results show that the cementation of loose sand particles to sandstone mainly relies on the microbial induced formation of magnesium carbonate precipitation around individual particles and at particle-particle contacts.Loose sand particles could be cemented to sandstone by bio-cement（microbial induced magnesium carbonate）. The bio-sandstone was firstly prepared, and then the compressive strength and the porosity of the sandstone cemented by microbial induced magnesium carbonate were tested to characterize the cementation effectiveness. In addition, the formed mineral composition and the microstructure of bio-sandstone were analyzed by X-ray diffraction（XRD） and scanning electron microscopy（SEM）, respectively. The experimental results show that the feasibility of binding loose sand particles using microbial induced magnesium carbonate precipitation is available and the acquired compressive strength of bio-sandstone can be excellent at certain ages. Moreover, the compressive strength and the porosity could be improved with the increase of microbial induced magnesium carbonate content. XRD results indicate that the morphology of magnesium carbonate induced by microbe appears as needles and SEM results show that the cementation of loose sand particles to sandstone mainly relies on the microbial induced formation of magnesium carbonate precipitation around individual particles and at particle-particle contacts.

关 键 词：bio-cement microbe magnesium carbonate precipitation bio-sandstone compressive 

分 类 号：TQ172.1[化学工程—水泥工业]