水泥基材料中微生物矿化机理及理论模型研究  

Study on the mechanism and model of microorganism mineralization in cementitious materials

作　　者：袁晓露[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《混凝土》2017年第9期84-88,共5页Concrete

基　　金：国家自然科学基金(51109122);湖北省教育厅科学研究计划项目(D20141204)

摘　　要：采用菌液浸泡法,研究了微生物矿化对水泥基材料的防护增强作用,分析了营养成分对微生物生长及矿化行为的影响,并结合微观测试结果,探讨了水泥基材料中微生物的矿化机理。结果表明,菌液浸泡后水泥试件强度显著提高,其中硫铝酸盐水泥基体与微生物矿化的适应性更好。水泥基材料中微生物的矿化遵循矿物成核作用的物理化学规律,硫铝酸盐水泥基体中,大量白色棱形颗粒状和花瓣状方解石型碳酸钙依附于水泥石基面定向排列生长;硅酸盐水泥基体中的方解石型碳酸钙呈团簇状覆盖于水泥石基面。菌液营养成分会影响微生物的矿化效率,当菌液中尿素浓度≤10 g/L时,随浓度的增大,微生物矿化强度提高;当钙离子浓度为2 mmol/L时,微生物的矿化强度最大。Effect of microorganism mineralization on the performance of cementitious materials was studied by the microbial soak method.Influence of nutrient components on the growth and mineralization of microorganism, as well as the microscopic structure of cement paste,were researched to explore the microorganism mineralization mechanism in cementitious materials.Results indicate that the strength of cement specimens is improved by the microbial soak method.Sulphoaluminate cement specimen shows a favorable compatibility with the microorganism mineralization.Microorganism mineralization in cementitious material is influenced by the microbial nutrients and the mineral nucleation effect.A large number of white prismatic granular and petal calcite is orientedly attached to the sulphoaluminate cement paste.Portland cement matrix is covered by of the cluster-shaped calcite.Whan the urea concentration is no more than 10 g/L, the mineralization intensity of microorganism is increased with the increase of urea concentration.Calcium concentration of 2 mmol/L presents the highest mineralization intensity of microorganism.

关 键 词：水泥基材料 微生物 矿化 机理 

分 类 号：TU528.041[建筑科学—建筑技术科学]