水工混凝土氯离子侵蚀模拟的相似性研究

Study on simulation similarity of chloride ion penetration into concrete

以典型海洋环境下温州市瓯江口一座既有水闸为背景,分析了处于潮差区的闸墩混凝土氯离子侵蚀参数,将其与室内模拟加速试验结果相比较,研究在人工气候环境下水工混凝土氯离子侵蚀参数的相似性。根据测定的混凝土不同深度处自由氯离子浓度,分析了既有闸墩混凝土的对流区厚度、氯离子浓度峰值,计算了混凝土的氯离子扩散系数;对比分析了人工气候环境与模拟环境中主要参数的相似性。分析结果表明,人工气候环境侵蚀试验中,氯离子对流区厚度和混凝土扩散系数等重要参数与自然环境下的侵蚀有相似规律。

On the basis of a sluice in typical marine environment at Oujiang River estuary in Wenzhou City, the chloride penetration parameters of sluice pier concrete that is located at a tidal ranges are analyzed and further compared with the results obtained in artificial climatic environment, so that the similarity of chloride ion penetration into concrete under artificial climatic environment is studied. Based on the measured chloride concentrations in the different depths of the concrete, the thicknesses of convection region and the peak values of chloride concentration in the concrete are analyzed, and the diffusion coefficients are calculated. The similarity of main parameters under the natural marine environment and artificial climatic environment are com- pared and studied. The analysis results show that some main parameters, especially thicknesses of convection region and diffusion coefficients, under simulation environment have similar law with that under natural marine environment.