In-Core Leaching Sampling and Modeling for Quantitative Prediction of Corrosion of Reinforcing Steel in Concrete

摘要CMS 9872323的目标是（a）模拟的核心浸出，和（B）的模拟预测的实验测试，最终集中在现场提取的核心应用。建模将制定氯离子运输的混凝土中的氯离子与粘合剂，进入混凝土取样开口。 特别感兴趣的变量包括开口尺寸和几何形状，以及氯化物扩散率。 模型输出将是适当收集介质中游离氯离子的时间演变，注意评估作为在有限测试时间内获得的结果的函数的最终量。实验将使用第一个混凝土/砂浆实验室样本与已知量的混合氯化物。 各种几何形状的开口和氯化物收集介质将用于评估介质中氯化物的时间演变，并将结果与模型预测进行对比。 一个初步的方法将详细说明，以优化精度的基础上的建模和实验结果。 接近尾声的调查，初步的方法将适用于混凝土样品提取的代表性领域的结构，试图获得游离氯离子浓度分布和推导出的结果氯离子结合等温线。

AbstractCMS 9872323The objectives are(a) modeling of in-core leaching, and (b) experimental testing of the modeling predictions ultimately focusing on application to field-extracted cores. Modeling will formulate chloride transport of chloride in concrete with binding agents, into concrete sampling openings. Variables of special interest include the opening size and geometry, and chloride diffusivity. The model output will be the time evolution of free chloride in suitable collecting medium, with attention to evaluating the terminal amount as function of results acquired in a limited test time. Experiments will use first concrete/mortar laboratory specimens with known amounts of admixed chloride. Openings of various geometries and chloride collecting media will be used to evaluate the time evolution of chloride in the media and contrast the results with model predictions. A preliminary methodology will be elaborated to optimize accuracy based on the modeling and experimental results. Toward the end of the investigation, the preliminary methodology will be applied to samples of concrete extracted from representative field structures, in an attempt to obtain free chloride concentration profiles and derive chloride binding isotherms from the results.