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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。
By fixing a plurality of sets of displacement sensors, the shrinkage deformations of concrete specimens with different water-cement ratios under different single-surface drying conditions at different depths were studied. At the same time, the humidity sensors were buried to study the changes of relative humidity in concrete at different depths. The results show that the shrinkage and relative humidity of the inner layer (55mm and 100mm from the surface) of concrete specimens are obviously lower than those of the concrete near surface (10mm from the surface), and the water-cement ratio is smaller. The difference between the shrinkage and the humidity gradient along the vertical direction of the concrete dry surface is greater. Under single-sided drying conditions, there is a good linear relationship between the shrinkage and the relative humidity reduction of the concrete layers at different depths. Under the same humidity conditions, Concrete shrinkage less than the inner concrete.