不同骨料用量与尺寸对混凝土干缩性能影响  

Influence of Amount and Size of Aggregate on Drying Shrinkage of Concrete

作　　者：刘海卿[1] 颜丙男 

机构地区：[1]辽宁工程技术大学建筑工程学院,阜新123000

出　　处：《硅酸盐通报》2015年第1期204-207,共4页Bulletin of the Chinese Ceramic Society

基　　金：高等学校博士点学科专项基金项目(20092121110001);辽宁省自然科学基金项目(20102091)

摘　　要：试验以不同骨料用量与尺寸为变量,研究了C30混凝土配合比条件下对混凝土干缩性能的影响,试验结果表明,随着混凝土干燥收缩龄期的增加,不同组配C30混凝土的干燥收缩长度变化率都有所增加;再生骨料组配混凝土的干燥收缩长度变化率要比普通混凝土大;在相同混凝土配比条件下随着骨料用量(体积率)的增加,不同组配混凝土的干燥收缩长度变化率都有所下降趋势,普通天然骨料体积变化率对混凝土干燥收缩长度变化率影响更明显,骨料用量越多,干燥收缩率越小;但再生骨料随着体积率的增大对混凝土干燥收缩长度变化率的影响相对有限;在相同配比条件下适当增加粗骨料的用量在一定程度上可以缓解混凝土的干燥收缩。we used the different amount and sizes of aggregate as variables. We studied its influence on the drying shrinkage of C30 concrete. The test shows that the different groups of C30 drying shrinkage have increased with the increasing of the time. The drying shrinkage rate of recycled aggregate concrete is bigger than the average groups. With the same concrete mix,the concrete drying shrinkage rate has decreased as the aggregate amount（ volume ratio） increasing. The volume of ordinary natural aggregate impacted on drying shrinkage of concrete more obviously. The drying shrinkage got smaller with more aggregates. But the influence of recycled aggregate volume ratio on the drying shrinkage is relatively limited. With the same proportion conditions,the increasing amount of coarse aggregate can relieve the drying shrinkage of concrete.

关 键 词：混凝土 骨料 干燥性能 组配 干缩率 

分 类 号：TU528[建筑科学—建筑技术科学]