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

目标是(a)对岩心内浸出进行建模，(b)对建模预测进行实验测试，最终重点是将建模预测应用于现场提取岩心。建模将制定氯化物运输氯化物在混凝土中与粘合剂，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。模型输出将是自由氯化物在合适的收集介质中的时间演变，并注意将终端数量作为有限测试时间内获得的结果的函数进行评估。实验将首先使用混凝土/砂浆实验室样品，其中含有已知量的混合氯化物。将使用各种几何形状和氯离子收集介质的开口来评估介质中氯离子的时间演化，并将结果与模型预测进行对比。在建模和实验结果的基础上，阐述了优化精度的初步方法。在调查结束时，初步方法将应用于从具有代表性的现场结构中提取的混凝土样品，试图获得游离氯化物浓度曲线并从结果中得出氯化物结合等温线。

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.