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根据混凝土中氯离子浓度曲线评价暴露在海洋或道路除冰盐环境下的混凝土结构钢筋腐蚀风险,是一个可靠而有效的方法。对暴露26a的码头和暴露21a的挡浪坝钻取了一批直径100mm的混凝土芯样,同时在实验室制作了三组配合比的混凝土试件进行对比试验。对暴露混凝土的原始资料和环境条件进行了分析,在实验室测定了芯样和试件中的氯离子分布,根据氯离子分布曲线对氯离子扩散系数进行了评价,分析了材料因素和环境因素对氯离子分布的影响。结果表明:实际暴露混凝土中氯离子扩散系数随暴露时间衰减明显;混凝土所处的局部环境造成表层氯离子分布形态有差异;但受混凝土暴露整体环境的影响,混凝土内部氯离子分布则比较一致;混凝土质量差异对氯离子侵入的影响需经过长时间暴露后才能得以反映。
It is a reliable and effective method to evaluate the corrosion risk of concrete structure exposed to sea or road deicing salt environment according to the chloride ion concentration curve in concrete. A batch of concrete core samples with a diameter of 100mm was drilled to the pier exposed at 26a and the retaining dam exposed at 21a. At the same time, three sets of concrete specimens with different proportions were made in the laboratory for comparative experiments. The raw materials and environmental conditions of the exposed concrete were analyzed. The distribution of chloride ions in the core sample and the test piece was measured in the laboratory. The chloride ion diffusion coefficient was evaluated according to the chloride ion distribution curve. The material factors and the environmental factors Impact on chloride distribution. The results show that the diffusion coefficient of chloride ions in actual exposed concrete decays obviously with the exposure time; the distribution of chloride ions in the surface layer is different due to the local environment of concrete; however, the distribution of chloride ion in concrete is more consistent with the overall environment exposed to concrete; The impact of concrete quality differences on chloride ion intrusion can only be reflected after prolonged exposure.