水泥净浆、水泥砂浆的压蒸膨胀率及孔隙结构与MgO掺量的关系研究  

Study on Relationships between Autoclave-treated Expansibility of Cement Paste and Mortar,Pore Structure and MgO Content

作　　者：陈昌礼[1] 方坤河[1,2] 雷平[3] 杜亚楠[1,4] 

机构地区：[1]贵州师范大学材料与建筑工程学院,贵州贵阳550059 [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [3]贵州师范大学分析测试中心,贵州贵阳550001 [4]贵州大学土木建筑工程学院,贵州贵阳550003

出　　处：《水电能源科学》2012年第10期87-90,共4页Water Resources and Power

基　　金：国家自然科学基金资助项目(50969002)

摘　　要：为合理确定混凝土中的MgO外掺量,通过室内试验测定了不同MgO外掺量的硬化水泥净浆、水泥砂浆的压蒸膨胀率,并对压蒸后的试样进行压汞试验、扫描电镜分析、背散射电子分析和X射线能谱分析。结果表明,MgO的掺量明显影响试样的密实度和孔隙结构。当MgO外掺量大于一定数值后,水泥浆、水泥砂浆的压蒸膨胀率发生显著增长,孔隙率明显增大,孔隙结构逐渐劣化。同时,水泥砂浆容许的MgO掺量多于水泥净浆,即利用水泥砂浆压蒸试件测得的MgO极限掺量比水泥净浆多。To ascertaining rational MgO content,the autoclave-treated expansibility of cement paste and cement mortar samples with different MgO content has been measured with indoor test.Hg intrusion test,scanning electron microscope analysis,backscattered electron analysis and x-ray diffraction analysis has been performed on the autoclave-treated samples.The results show that the MgO content has obviously impacts on the degree of density and pore structure of samples.If the MgO content is larger than a certain value,autoclave-treated expansibility of cement paste and mortar sample increases markedly.Porosity increases obviously and pore structure of sample gradually deteriorates.Meanwhile,the permissible MgO content of cement mortar is higher than that of cement paste.The ultimate mixed MgO measured with autoclave-treated specimen of cement mortar is higher than that of cement paste.

关 键 词：水泥净浆 水泥砂浆 MGO混凝土 压蒸膨胀率 孔隙结构 轻烧MgO 

分 类 号：TV431[水利工程—水工结构工程]