冻融循环作用下混凝土的受拉性能研究

Experimental Study on Tensile Properties of Concrete after Freeze Thaw Cycles

关键词:  混凝土  冻融循环  受拉峰值应力  受拉静弹性模量  受拉峰值应变

Key words:  concrete  freeze thaw cycle  tensile peak stress  tensile static elastic modulus  tensile peak strain

摘要:

采用不同强度等级的混凝土试件，通过快速冻融试验方法，对经过冻融损伤的混凝土单轴受拉性能和劈拉性能进行了试验研究，分析了冻融次数、混凝土强度等级对混凝土受拉性能的影响，建立了冻融后混凝土受拉峰值应力与劈拉强度的关系.结果表明，随着冻融循环次数的增加，混凝土的受拉力学性能和变形性能均呈明显的下降趋势；随着混凝土强度等级提高，各性能指标随冻融循环次数的增加，下降趋于缓慢.

Abstract:

In order to analyze the effect of freeze thaw cycles and strength grades of concrete on tensile property, concrete samples of different strength grades undergoing rapid freeze thaw cycles were subjected to uniaxial tensile experiment and splitting tensile experiment. Tensile peak stress and splitting tensile strength were measured and simple mathematical models were proposed. Research shows that as freeze thaw cycles increase, the tensile mechanical and deformational properties of concrete are reduced; the higher the strength grade is, the more slowly these properties are lowered.