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Experimental Study and Reactive Transport Modeling of Boric Acid Leaching of Concrete

机译:混凝土中硼酸浸出的试验研究及反应输运模型

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Borated water leakage through spent fuel pools (SFPs) at pressurized water reactors is a concern because it could cause corrosion of reinforcement steel in the concrete structure, compromise the integrity of the structure, or cause unmonitored releases of contaminated water to the environment. Experimental data indicate that pH is a critical parameter that determines the corrosion susceptibility of rebar in borated water and the degree of concrete degradation by boric acid leaching. In this study, reactive transport modeling of concrete leaching by borated water was performed to provide information on the solution pH in the concrete crack or matrix and the degree of concrete degradation at different locations of an SFP concrete structure exposed to borated water. Simulations up to 100 years were performed using different boric acid concentrations, crack apertures, and solution flow rates. Concrete cylinders were immersed in boric acid solutions for several months and the mineralogical changes and boric acid penetration in the concrete cylinder were evaluated as a function of time. The depths of concrete leaching by boric acid solution derived from the reactive transport simulations were compared with the measured boric acid penetration depth.
机译:硼酸从压水反应堆的乏燃料池(SFP)泄漏的问题是一个令人担忧的问题,因为它可能导致混凝土结构中的钢筋腐蚀,损害结构的完整性,或导致未经监控的污水排放到环境中。实验数据表明,pH是决定钢筋在含硼水中的腐蚀敏感性以及硼酸浸出对混凝土降解程度的关键参数。在这项研究中,通过波状水浸出混凝土的反应运输模型进行了建模,以提供有关混凝土裂缝或基质中溶液的pH值以及暴露于波状水的SFP混凝土结构不同位置的混凝土降解程度的信息。使用不同的硼酸浓度,裂纹口和溶液流速进行了长达100年的模拟。将混凝土圆柱体浸入硼酸溶液中数月,并根据时间评估矿物学变化和硼酸在混凝土圆柱体中的渗透率。将反应运输模拟得出的硼酸溶液浸出混凝土的深度与测得的硼酸渗透深度进行了比较。

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