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氯盐侵蚀下钢筋混凝土氯离子扩散系数试验及其概率分析

, PP. 77-83

Keywords: 桥梁工程,RC结构,钢筋锈蚀时间模型,扩散系数,氯离子,空间变异性

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Abstract:

?为了研究混凝土中氯离子渗透机理及其空间分布对结构锈蚀的影响,利用人工气候环境模拟箱对混凝土试件进行氯盐喷雾试验,研究了自然扩散条件下不同水灰比混凝土试件氯离子扩散规律。基于实测数据,建立了混凝土中氯离子扩散系数随氯盐侵蚀深度及水灰比变化的计算模型。考虑扩散系数以及混凝土强度等参数的空间变异性,基于随机场理论,建立了RC结构锈蚀开始时间的时空可靠度模型。研究结果表明:混凝土中氯离子扩散系数随水灰比提高而提高,氯离子渗透速度随着渗透深度增加而减慢;考虑时空变异性的氯离子侵蚀下结构锈蚀发生概率比不考虑时空变异性下高13.1%~18.5%,基于所提出的动态扩散系数模型的结构锈蚀发生时间比静态扩散系数时要提前约16.7%。

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