交变荷载作用下损伤混凝土中氯离子传输行为

摘要

根据氯离子在混凝土中的传输机制,从交变荷载作用下混凝土的疲劳损伤入手,基于裂纹面积来表征氯离子扩散系数,从微观角度定量分析了疲劳损伤对混凝土裂纹面积扩展值的影响;根据Fick第二定律建立了交变荷载作用下损伤混凝土中的氯离子传输模型,并给出了其解析解.结果表明:所建模型计算结果与室内试验结果吻合良好,说明交变荷载作用下损伤混凝土中氯离子传输模型所应用的理论和提出的假设具有一定的合理性和科学性.%According to the transport mechanism of chloride ion in concrete,the fatigue damage of concrete under alternating load was discussed.The chloride diffusion coefficient was related to the area of cracks.The effect of fatigue damage on crack area expansion value of concrete was quantitatively analyzed from the microscopic point.Based on Fick,s second law,chloride ion transport model of damaged concrete under alternating load was established.The calculated results were compared with the test values of indoor experiment.The results show that the calculated results from the proposed model are in good agreement with the test values.The applied theory and the proposed hypothesis of chloride ion transport model for damaged concrete under alternating load are reasonable.