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开裂状态下沿海干湿区桥梁粉煤灰混凝土氯离子扩散模型

, PP. 40-49

Keywords: 桥梁工程,开裂混凝土,氯盐干湿循环试验,氯离子扩散模型,裂缝宽度,粉煤灰掺量

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Abstract:

?为了明确沿海干湿交替区域桥梁结构混凝土在开裂状态下的氯离子侵蚀机理,结合现有研究提出了考虑表层对流影响的开裂混凝土氯离子传输的修正扩散模型。以粉煤灰掺量、裂缝宽度为主要影响因素,对3组混凝土梁进行了氯盐干湿循环试验研究,借助15次和30次干湿循环后的取样结果,分析了裂缝宽度对表层对流区深度的影响,并用修正扩散模型拟合氯离子浓度分布的适用性,探讨了粉煤灰掺量、裂缝宽度对氯离子扩散特性的影响规律。研究结果表明:表层对流区深度在8~15mm之间,且其随裂缝宽度w的增大而增大;用修正扩散模型分析开裂混凝土(w<0.30mm)的氯离子浓度分布是可行的,其综合效应系数K在1~20之间;龄期衰减指数m随粉煤灰掺量的提高而增大,而氯离子扩散系数则随粉煤灰掺量的提高而降低;裂缝宽度对氯离子扩散系数的影响可用w的二次多项式函数进行描述。

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