模拟干湿环境对混凝土内水分影响深度的影响

Effect of Simulated Drying-Wetting Environment on Water Influence Depth in Concrete

建立了混凝土内水分影响深度的平衡时间比模型,研究了混凝土水灰比、初始饱和度及混凝土表面的环境饱和度对模拟环境中混凝土平衡时间比的影响,通过数值计算探讨了混凝土水灰比、初始饱和度及混凝土表面的环境饱和度与混凝土内水分影响深度间的关系,并构筑出水分影响深度模型,最后分析了不同混凝土平衡时间比求解方法之间的异同.结果表明:不同求解方法所得混凝土平衡时间比一致,所求得的平衡时间比与实测值基本吻合;混凝土平衡时间比与混凝土水灰比、初始饱和度及混凝土表面的环境饱和度存在良好的指数函数关系;混凝土内水分的影响深度与润湿时间的平方根间成线性关系.

In this paper,first,an equilibration time ratio model of water influence depth in concrete is established, and the equilibration time ratio in simulated environment,which is influenced by three parameters,namely,the water-to-cement ratio,the initial concrete saturation,and the environment saturation around concrete surface,is in-vestigated.Then,the relationships between the three parameters and the water influence depth in concrete are ana-lyzed via numerical calculation,and a model describing the water influence depth is constructed.Finally,the differences and similarities of the solving methods for equilibration time ratio are discussed.The results show that （1 ）different solving methods help to obtain the same equilibrium time ratio that basically accords with the test re-sults;（2）there exists an obvious exponential relationship between the equilibration time ratio and such parameters as the water-to-cement ratio,the initial concrete saturation and the environment saturation around concrete surface;and （3）the water influence depth in concrete is linear to the square root of wetting time.