模拟氧化镁混凝土的压蒸试验研究  

Study on autoclave test of simulative concrete mixed with magnesium oxide

作　　者：杜亚楠[1] 陈昌礼[1,2] 方坤河[2,3] 

机构地区：[1]贵州大学土木建筑工程学院,贵州贵阳550003 [2]贵州师范大学材料与建筑工程学院,贵州贵阳550059 [3]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

出　　处：《混凝土》2013年第2期17-20,共4页Concrete

基　　金：国家自然科学基金项目资助(50969002)

摘　　要：为研究外掺MgO混凝土的压蒸膨胀变形,采用粗砂、中砂、细砂和石粉等量替代外掺MgO混凝土中大石、中石、小石和砂子的方法来模拟实际工程中的二级配和三级配MgO混凝土。研究结果表明:与水泥净浆压蒸法比较,采用模拟试验法确定的MgO极限掺量较高。同时,再次证明,外掺MgO混凝土试件的压蒸膨胀率随着MgO掺量的增加而增大;粉煤灰对外掺MgO混凝土试件的压蒸膨胀率有抑制作用,但掺粉煤灰后试件的相对抗压强度有所提高。The autoclave expansion deformation of concrete mixed with magnesium oxide was tested.In the test, the large, medium, little particle size of coarse aggregate and sand of the magnesium oxide concrete was instead respectively by the coarse, medium, fine particle size of sand and stone powder in equal amount.This method could be used to simulate the second grade and third grade concrete mixed with magnesium oxide in actual project.The research results showed that the autoclave expansion rate of magnesium oxide concrete was increased with the increase of the rate of magnesium oxide,the fly ash could inhibit expansion but improve compressive strength of magnesium oxide concrete.

关 键 词：MGO混凝土 模拟试验法 压蒸膨胀率 相对抗压强度 

分 类 号：TU528.01[建筑科学—建筑技术科学]