镁盐对微生物水泥净浆微观结构性能的影响  

Effect of magnesium on microstructure of microbial cement paste

作　　者：袁晓露[1] 胡为民[2] 刘冬梅[3] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002 [2]三峡大学化学与生物学院,湖北宜昌443002 [3]三峡大学地质灾害教育部重点实验室,湖北宜昌443002

出　　处：《混凝土》2015年第10期14-16,共3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X射线衍射、扫描电镜、能谱分析、压汞测孔法等亚微观测试手段,研究了镁盐对微生物水泥净浆微观结构性能的影响。结果表明,当营养液中仅含钙盐时,微生物矿化产物以方解石为主,并含少量球霰石,矿物呈颗粒状、团簇状。适量镁盐的掺入促进了微生物的矿化作用,形成了针棒状菱镁矿型碳酸镁和方解石型碳酸钙,降低了孔隙率,增加了微细孔隙比率,改善了材料的孔结构。Effect of magnesium on the microstructure of microbial cement paste was researched through the X-ray diffraction method（ XRD）, scanning electron microscope（ SEM）,energy dispersive spectroscopy（ EDS） and mercury intrusion porosimetry（ MIP）.Results indicate that when no magnesium salt is contained, large amounts of calcite as well as small vaterite are formed in the precipitation powder,which are particles and clusters; while both calcite and magnesite are detected when the appropriate magnesium salt is involved.These white needles and bars of calcite and magnesite are attached onto the pore surface of cementitous materials,which decreases the porosity and increases the amount of micro-pores of cement paste.

关 键 词：镁盐 微生物 矿化 水泥净浆 微观结构 

分 类 号：TU528.01[建筑科学—建筑技术科学]