微生物水泥净浆的自修复性能研究  

Effect of magnesium on properties of microbial cement paste

作　　者：袁晓露[1] 胡为民[2] 刘冬梅[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002 [2]三峡大学化学与生命科学学院,湖北宜昌443002

出　　处：《混凝土》2015年第6期114-116,120,共4页Concrete

基　　金：湖北省教育厅科学研究计划项目(D20141204)

摘　　要：研究了微生物矿化对水泥基材料的自修复作用,试验测定了微生物水泥净浆的裂缝自愈合、抗压强度、吸水率、孔结构等性能,并采用X射线衍射对矿化产物进行成分分析。结果表明微生物的掺入使普通硅酸盐水泥净浆和硫铝酸盐水泥净浆的抗压强度增加,吸水率下降;试件裂缝处自愈合形成了一条连续、饱满的灰白色矿物填充带。矿化生成的方解石型碳酸钙和菱镁矿型碳酸镁沉淀填充于试件内部缺陷、裂缝,使水泥净浆的总孔隙率及其增长率下降微细孔隙比例增加促进了材料的自修复,改善了其孔结构。Effect of microorganism mineralization on the crack filling,compressive strength,water absorption ratio and pore structure of the cement paste was researched.X-ray diffraction method was performed to analyze the components of precipitation.Results indicate that the addition of bacteria in both the sulphoaluminate cement paste and the ordinary Portland cement paste achieves the better crack filling increased compressive strength and decreased water absorption ratio.The precipitations of both calcite and magnesite fill the pores and cracks in the cement paste,which reduces the total porosity and its growth rate and increases the proportion of micro- pores.This makes microstructure denser and improves the self-healing performance of cement paste.

关 键 词：微生物 矿化 水泥净浆 自修复 

分 类 号：TU528.01[建筑科学—建筑技术科学]