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荷载作用下基于Torrent法的混凝土渗透性研究
作者：余韬，孙正华，魏晓斌，邱学刚
（江苏省建筑工程质量检测中心有限公司，江苏 南京 210028）
摘要：研究了在压应力和均布荷载2种不同类型力的作用下，混凝土空气渗透系数的变化规律。同时在无荷载作用下，研究了混凝土空气渗透系数和氯离子扩散系数、电通量之间的关系。结果表明，水胶比越小，混凝土强度等级越高，空气渗透系数越小。不同强度等级的混凝土，空气渗透系数随应力比变化的趋势一致，当应力比小于转变点时，空气渗透系数随应力比增大而减小，当应力比大于转变点时，空气渗透系数随应力比的增大而快速增大。混凝土构件试验表明，空气渗透系数能较好地反映构件不同受力区域的渗透性变化。
关键词：荷载作用；渗透性；空气渗透系数；混凝土；Torrent法
中图分类号：TU528.01 文献标识码：A 文章编号：1001-702X（2020）08-0065-04
Load effect to permeability of concrete based on Torrent method
YU Tao，SUN Zhenghua，WEI Xiaobin，QIU Xuegang
（Jiangsu Testing Center for Quality of Construction Engineering Co. Ltd.，Nanjing 210028，China）
Abstract：This paper studies the change rules of air permeability coefficient of concrete under different compressive stress and uniformly distributed load. At the same time，studied the relationship between concrete air permeability coefficient，chloride ion diffusion coefficient and electric flux without load. The results show that the lower the water-cement ratio，the higher the concrete strength grade and the lower the air permeability coefficient is. The air permeability coefficient of concrete with different strength grades has the same trend with the stress ratio. When the stress ratio is smaller than the transition point，the air permeability coefficient decreases with the increase of the stress ratio，and when the stress ratio is larger than the transition point，the air permeability coefficient increases rapidly with the increase of the stress ratio. The test results of concrete members show that the air permeability coefficient can reflect the permeability change of different stress zones.
Key words：load，permeability，air permeability coefficient，concrete，Torrent method