粉煤灰对外掺氧化镁混凝土压蒸膨胀变形和孔隙结构的影响  

INFLUENCE OF FLY ASH CONTENT ON AUTOCLAVE-TREATED EXPANSIBILITY AND PORE PARAMETERS OF CONCRETE MIXED WITH MgO

作　　者：李维维[1] 陈昌礼[1] 方坤河[1,2] 陈荣妃[1,3] 

机构地区：[1]贵州师范大学材料与建筑工程学院,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,武汉430072 [3]贵州大学土木建筑工程学院,贵阳550003

出　　处：《建筑技术》2014年第1期80-83,共4页Architecture Technology

基　　金：国家自然科学基金项目(50969002;51269003);贵州省科技厅-贵州师范大学联合基金项目(黔科合J字[2009]2)

摘　　要：通过粉煤灰对外掺氧化镁混凝土压蒸膨胀变形和孔隙结构影响的试验研究,得到结果表明,粉煤灰的掺入使混凝土的压蒸膨胀率降低,但粉煤灰掺量超过30%后,降低的幅度减小。粉煤灰的掺入使混凝土平均孔径细化,无害孔隙和少害孔隙的比例增大,混凝土的孔隙构造得到改善。MgO掺量越大,粉煤灰对混凝土的压蒸膨胀率的抑制作用越明显;同时,随着MgO掺量的增大,粉煤灰对混凝土的平均孔径的改善也越明显。The influence of fly ash content on the autoclave-treated expansibility and pore parameters ofconcrete mixed with MgO are tested. The results show that the autoclave-treated expansibility of concrete with fly ash is reduced, but the range of reducing is reduced when the fly ash content passes 30 percent. The average in size of aperture is refined, and the proportion of innocuous and less harmful pore is increased, meanwhile, the pore structure is improved of concrete with fly ash. The more obvious inhibitory effect to the autoclave-treated expansibility and the more obvious improvement to the average in size of aperture with MgO content increasing.

关 键 词：粉煤灰 水工混凝土 压蒸膨胀率 孔隙结构参数 

分 类 号：TU528.04[建筑科学—建筑技术科学]