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采用不同的最大应力水平和不同的疲劳次数对C30混凝土进行拉伸疲劳试验,然后采用残余拉应变、基于超声波波速的疲劳损伤度和基于电化学阻抗谱的损伤电阻对拉伸疲劳后混凝土的疲劳损伤进行表征,研究混凝土氯离子扩散系数和疲劳损伤之间的关系.结果表明:残余拉应变越大,混凝土氯离子扩散系数也越大,残余拉应变25×10~(-6)可以作为混凝土耐氯离子侵蚀性能的起劣点;混凝土氯离子扩散系数随着疲劳损伤度的增加而增大,两者之间呈指数函数关系;混凝土氯离子扩散系数随着损伤电阻的增大而减小,两者之间呈指数函数关系.
Tensile fatigue tests were carried out on C30 concrete with different maximum stress levels and different fatigue times, and then the residual tensile strain, the fatigue damage degree based on the ultrasonic wave velocity and the damage resistance of the concrete after tensile fatigue based on the electrochemical impedance spectroscopy The results show that the larger the residual tensile strain is, the larger the chloride ion diffusion coefficient of concrete is, and the residual tensile strain of 25 × 10 -6 can be used as the concrete Chloride ion corrosion resistance of the starting point; concrete chloride ion diffusion coefficient increases with the increase of fatigue damage degree, an exponential function between the two; concrete chloride ion diffusion coefficient decreases as the damage resistance increases , Exponential function between the two.