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首页> 外文期刊>Ocean Engineering >Statistical investigation of different analysis methods for chloride profiles within a real structure in a marine environment
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Statistical investigation of different analysis methods for chloride profiles within a real structure in a marine environment

机译：海洋环境中真实结构中氯化物剖面的不同分析方法的统计调查

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Corrosion is a major problem for durability of reinforced concrete structures in a marine environment. To establish the best accurate planning for maintenance operations, assessing chloride ingress within concrete is essential. The present paper reports a study conducted to investigate a large amount of field chloride data collected from a 28-years old beam in a splash zone. The chloride profiles are examined based on Fick's second law to estimate the surface content C-s and the diffusion coefficient D. Firstly, three different cases considering the location of the maximum chloride content are tested: a reference case (individual analysis), a 15-mm discarded case and a 20-mm discarded case (generic treatments). The results highlight the importance of the individual analysis. C-s and D, indeed, appear to be significantly affected by the generic treatment, the relative error being around 50% for C-s and 100% for D. A focus is therefore placed on the individual analysis. The coefficients of variation are 44% and 61% for C-s and D, respectively. For the statistical distribution, both parameters show a clear dependence. They also follow a lognormal law with a mean value ranging between 0.0057 and 0.0085 kg(cl)/kg(concrete) for C-s and equal to 1.3 x 10(-12) m(2)/s for D.
机译：腐蚀是海洋环境中钢筋混凝土结构耐久性的主要问题。为了建立最佳的维护计划，评估混凝土中的氯化物侵入至关重要。本论文报告了一项研究，以调查从飞溅区中28年的旧光束中收集到的大量现场氯化物数据。根据菲克第二定律检查氯化物的分布，以估算表面含量Cs和扩散系数D。首先，测试了三种考虑最大氯化物含量的情况：参考情况（单独分析），直径15毫米丢弃的情况和20毫米丢弃的情况（通用处理）。结果突出了个体分析的重要性。实际上，C-s和D似乎受到通用处理的显着影响，C-s和D的相对误差约为50％，因此，将重点放在单个分析上。 C-s和D的变异系数分别为44％和61％。对于统计分布，两个参数都显示出明显的依赖性。他们还遵循对数正态定律，C-s的平均值在0.0057至0.0085 kg（cl）/ kg（混凝土）之间，D的平均值在1.3 x 10（-12）m（2）/ s之间。

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