既有混凝土码头的时变氯离子扩散过程

摘要/Abstract

摘要：

为了研究不同暴露环境(大气区、潮差区和浪溅区)对氯离子在混凝土中传输的影响，以及氯离子扩散过程的时变特性，对北部湾某码头的混凝土现场耐久性进行了检测，得到了不同深度混凝土试样的自由氯离子浓度.结果表明，在同一侵蚀深度，浪溅区的氯离子浓度最大，潮差区的次之，大气区的最小，拟合得到的表面氯离子浓度和表观氯离子扩散系数亦表现出了相同特性；浪溅区是影响临海钢筋混凝土结构耐久性的最不利暴露环境；氯离子扩散系数随侵蚀时间递减，时间参数为服从正态分布的随机变量，大气区、潮差区和浪溅区时间参数的均值分别为0.19，0.36和0.43；在钢筋混凝土结构的耐久性分析中应考虑氯离子扩散系数的时变特性.

关键词: , 混凝土, 氯离子扩散, 暴露环境, 时间参数

Abstract:

A field investigation was carried out in Beibu gulf and the free chloride concentration in the concrete samples was determined. The results showed that at given depths, the chloride concentration reached the highest in the splash zones and was the second in the tidal zones and lowest in the atmospheric zones. Similarly characters were observed by the fitted surface chloride concentration and the chloride diffusion coefficient. It can be concluded that splash zones affect concrete structures more harshly than tidal zones and atmospheric zones. Chloride diffusion coefficient decreases with time passing by, and age factor obeys the normal distribution. In atmospheric, tidal and splash zones, the mean values of the age factor are 0.19, 0.36 and 0.43, respectively. The investigation shows that the timedependent property of chloride diffusion coefficient has to take into account in durability assessment.

Key words: concrete, chloride, exposure condition, age factor

中图分类号:

TU 528.0

吴灵杰，寇新建，周拥军，蒋萌. 既有混凝土码头的时变氯离子扩散过程[J]. 上海交通大学学报（自然版）, 2017, 51(4): 444-.

WU Lingjie,KOU Xinjian,ZHOU Yongjun,JIANG Meng. TimeDependent Chloride Transport in Existing Concrete Docks[J]. Journal of Shanghai Jiaotong University, 2017, 51(4): 444-.

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