Influence of molding process on mechanical properties of sandstone cemented by microbe cement
Influence of molding process on mechanical properties of sandstone cemented by microbe cement
复制标题
成型工艺对微生物胶结砂岩力学性能的影响
DOI：
10.1016/j.conbuildmat.2011.08.039
复制
发表时间：
2012-03-01
影响因子：
7.4
通讯作者：
Li, Long-zhi
中科院分区：
文献类型：
--
作者：
Rong, Hui;Qian, Chun-xiang;Li, Long-zhi
随着人们环保意识的不断增强，新一代水泥--微生物水泥应运而生。微生物水泥是一种基于微生物诱导碳酸钙沉淀的新型水泥加固技术。本文证实了微生物水泥胶结疏松砂粒的可行性，并介绍了成型工艺（无压成型、压力成型、间歇无压成型和泵送成型）对砂岩微生物水泥胶结体力学性能影响的实验研究结果。结果表明，成型工艺对生物砂岩的力学性能有很大的影响。采用泵送成型工艺结合的砂岩微生物水泥强度高于其它三种工艺，其强度可达12.0MPa。同时，采用扫描电子显微镜（SEM）图像分析技术，测量了不同成型工艺引起的多孔特性的相应变化。结果表明，泵送成型工艺制备的生物砂岩孔隙率较低，碳酸钙含量较高。(C)2011爱思唯尔有限公司保留所有权利。
A new generation of cement, microbe cement has been developed due to the ever increasing awareness of environmental protection. Microbe cement is a new strengthening technique based on microbiologically induced precipitation of calcium carbonate. This paper confirms the feasibility of microbe cement binding loose sand particles and presents results from a laboratory research on the influence of molding process (non-pressure molding, pressure molding, discontinuous non-pressure molding and pumping molding) on the mechanical properties of sandstone microbe cement bound. The results showed that the ways of molding procedure had a strong influence on the mechanical properties of bio-sandstone. The strength, which was up to 12.0 MPa, of sandstone microbe cement bound by adopting pumping molding process was higher than other three processes. Meanwhile, Scanning electron microscope (SEM) image analysis technique was adopted to measure the corresponding variation of porous characteristics caused by different molding processes. The results indicate that the microstructure of bio-sandstone adopted by pumping molding has lower porosity and higher content of precipitated calcium carbonate than other three molding processes. (C) 2011 Elsevier Ltd. All rights reserved.