蒸压粉煤灰砖在使用阶段的干燥收缩试验研究  

Experimental research on drying shrinkage of autoclaved fly ash brick in service stage

作　　者：梁建国[1] 程少辉 彭茂丰[3] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410004 [2]湖南省建筑工程集团,湖南长沙410004 [3]湖南农业大学工学院,湖南长沙410128

出　　处：《中南大学学报（自然科学版）》2010年第4期1578-1583,共6页Journal of Central South University:Science and Technology

基　　金：建设部国家标准资助项目(建标[2007]125号)

摘　　要：为了控制蒸压粉煤灰砖砌体房屋的干燥收缩裂缝,按照快速法和慢速法对上墙相对含水率不同的蒸压粉煤灰砖在不同相对湿度下的干燥收缩进行试验研究。试验结果表明:按标准(快速)法得到的蒸压粉煤灰砖的干燥收缩率为慢速试验法的48%,且蒸压粉煤灰砖使用阶段的干燥收缩率随着上墙相对含水率的增大而增大,随着环境相对湿度增大而减小。通过对试验结果的回归分析,得到了上墙相对含水率影响系数、环境相对湿度影响系数以及龄期影响系数,得出了蒸压粉煤灰砖使用阶段干燥收缩率的估算公式。In order to avoid cracking in autoclaved fly-ash brick masonry walls due to drying shrinkage,the drying shrinkage of autoclaved fly-ash brick with different relative moisture contents in different relative humidities were tested using rapid method and comparatively slow method.The test results show that the drying shrinkage of autoclaved fly ash brick using rapid method is 48% of that using slow method,and the drying shrinkage of autoclaved fly ash bricks in service stage increases with the increase of relative moisture content and decreases with the increase of relative humidity.The moisture content factor,the relative humidity factor as well as the age factor can be obtained by regression analysis of the test results.The predicting formula of the drying shrinkage of autoclaved fly-ash brick in service stage is obtained.

关 键 词：蒸压粉煤灰砖 干燥收缩 含水率 相对湿度 龄期 

分 类 号：TU362[建筑科学—结构工程]