摘要
通过固定多组位移传感器方法,研究了单面干燥条件下不同硅灰掺量的混凝土试件距离表面不同深度处的收缩变形分布规律,同时采用埋置湿度传感器的方法研究了不同深度处的混凝土相对湿度变化规律。结果表明:混凝土试件内层的收缩和相对湿度降低明显小于表层混凝土;硅灰的掺加,能显著减小这种收缩变形与湿度梯度差。单面干燥条件下,不同深度层混凝土的收缩值与其相对湿度值之间均存在较好的线性关系;但在达到相同湿度条件时的表层混凝土收缩值小于内层混凝土。
The shrinkage deformations of specimens of concrete added with different amount of silica fume with one-sided drying at various depths from drying surface were investigated by fixation of several groups of displacement sensors.The relative humidity changes of concrete at various depths were also studied using embedded humidity sensors.The results showed that the shrinkage and the humidity reduction in the internal layer of concrete are markedly lower than those in the near-surface layer.adding silica fume to concrete reduces significantly the shrinkage difference from drying surface to internal layer of concrete and the humidity gradient.Under the one-sided drying condition,there are good linear relationships between the shrinkage and the humidity at various depths in concrete.However,the shrinkage in the surface layer of concrete is lower than that in the internal layer at the same relative humidity.
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2010年第3期694-698,共5页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(50408016)
中国博士后科学基金项目(20060400825)
关键词
土木工程
混凝土
硅灰
单面干燥
收缩
非均匀分布
civil engineering
concrete
silica fume
one-sided drying
shrinkage
non-uniform distribution
