单面干燥条件下混凝土的收缩变形分布特征  

SHRINKAGE DISTRIBUTION OF CONCRETE WITH ONE SURFACE EXPOSED TO DRY CONDITION

作　　者：高小建[1] 阚雪峰[1] 杨英姿[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150006

出　　处：《硅酸盐学报》2009年第1期87-91,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50408016)资助项目;中国博士后科学基金(20060400825)资助项目。

摘　　要：通过固定多组位移传感器,研究了单面干燥条件下不同水灰比混凝土试件距离表面不同深度处的收缩变形,同时埋置湿度传感器,研究了不同深度处混凝土中相对湿度变化。结果表明:混凝土试件内层(距表面55mm和100mm)的收缩和相对湿度降低明显小于混凝土近表层(距表面10mm)的;水灰比越小。沿混凝土干燥表面垂直方向的收缩与湿度梯度差越大;单面干燥条件下,不同深度混凝土层的收缩与其相对湿度降低值之间均存在较好的线性关系,在达到相同湿度条件时的表层混凝土收缩小于内层混凝土。The shrinkage strain of concrete with different water-cement ratios was measured in various depths from the exposed sur- face by using several pairs of fixed sensors.Only one surface of the concrete specimen was exposed to the dry condition during the experiment.The relative humidity change of concrete at various depths from the exposed surface was also studied by using embedded humidity sensors.The results show that the shrinkage and relative humidity reduction are markedly lower in the internal layer(55 m...

关 键 词：混凝土 单面干燥 收缩 相对湿度 非均匀分布 

分 类 号：TU528[建筑科学—建筑技术科学]