硅酸盐学报2013，Vol.41Issue(5)：620-626,7.DOI:10.7521/j.issn.0454-5648.2013.05.07
自修复混凝土中微生物矿化方解石的形成机理
Mechanism of Microbially Induced Calcite Precipitation in Self-healing Concrete
摘要
Abstract
The process of microbially induced calcite precipitation was investigated via the control of mineralization production, pH value, O2 and substrate, respectively. The experimental results show that the mineral precipitation induced by bacteria is calcite crystal, and the mineralization process needs O2. The pH value of bacteria liquid increased from 7.0 to 8.3 gradually when the bacteria grew, which plays an important role in the bacteria mineralization process. Calcite was formed due to the bacterial metabolic conversions rather than the direct decomposition of substrate under the action of extracellular enzymes. The metabolic process produced CO2, the substrate provided Ca2+ and CO32-, and other organic nutrients could also provide CO32-. The possible mechanism of bacterial induced mineral precipitation was analyzed. The results show that the growth of bacteria creates an alkaline environment and produces CO2 through various physiological activities. The cell wall of bacteria was negatively charged, affecting calcium carbonate precipitation by acting as sites of nucleation or calcium enrichment. The produced CO2 molecules reacted with Ca2+ to form calcite crystal in alkaline environment.关键词
自修复混凝土/微生物诱导/方解石沉淀/矿化/机理Key words
self-healing concrete/ microbially induced/ calcite precipitation/ mineralization/ mechanism分类
土木建筑引用本文复制引用
钱春香,罗勉,潘庆峰,李瑞阳..自修复混凝土中微生物矿化方解石的形成机理[J].硅酸盐学报,2013,41(5):620-626,7.基金项目
国家自然科学基金(51178104) （51178104）
教育部博士点基金(201100-92110033)资助项目. （201100-92110033）
