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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >On Durability of Reinforced Concrete Structures: A Design Methodology for RC Beams and Columns in Corrosive Environments
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On Durability of Reinforced Concrete Structures: A Design Methodology for RC Beams and Columns in Corrosive Environments

机译：钢筋混凝土结构的耐久性：腐蚀环境下钢筋混凝土梁和柱的设计方法

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摘要

The work presents a design methodology for carrying out durability-based optimal design of reinforced concrete (RC) structures exposed to corrosive environments causing the problems of chloride-induced reinforcement corrosion. For the purpose, an extensive experimental investigation was carried out to generate the data required for obtaining empirical models for relating chloride-induced reinforcement corrosion rate with the key affecting factors. Concrete test specimens were prepared with cementitious material contents of 350, 375 and 400 kg/m(3), water-cementitious ratios of 0.4, 0.45 and 0.5, fine-to-total aggregate ratios of 0.35, 0.4 and 0.45 and cover thicknesses of 25, 37.5 and 50 mm. The specimens were then exposed to chloride solution of three different concentrations and were tested for determining corrosion rate using electrochemical and gravimetric weight loss methods. Reinforcement corrosion rates (determined electrochemically and gravimetrically) were first analyzed to determine statistical correlation between the corrosion rates obtained by the two methods. Then, the gravimetric reinforcement corrosion rate results were utilized for developing regression models for reinforcement corrosion rates in terms of concrete quality parameters, concrete cover thickness and chloride concentration. The regression models of reinforcement corrosion rates obtained through the present work and the models for strength and elastic modulus of concrete reported in the literature were adapted to develop an automated analysis and design methodology using Microsoft Excel solver for durability-based optimal design of RC beam and column under specified chloride exposure corrosive environments. Sample results obtained from the proposed optimal design methodology (for RC beams and columns in corrosive environments) are presented and discussed.
机译：这项工作提出了一种设计方法论，用于对暴露于腐蚀环境下的钢筋混凝土（RC）结构进行基于耐久性的优化设计，从而导致氯化物引起的钢筋腐蚀问题。为此，进行了广泛的实验研究，以生成获得经验模型所需的数据，该经验模型将氯化物诱导的钢筋腐蚀速率与关键影响因素相关联。制备的混凝土试样的胶结材料含量为350、375和400 kg / m（3），水凝比为0.4、0.45和0.5，细骨料与总骨料之比为0.35、0.4和0.45，表皮厚度为25、37.5和50毫米。然后将样品暴露于三种不同浓度的氯化物溶液中，并使用电化学和重量失重法进行测试以确定腐蚀速率。首先分析增强腐蚀速率（通过电化学和重量测定），以确定通过两种方法获得的腐蚀速率之间的统计相关性。然后，将重量钢筋腐蚀速率结果用于根据混凝土质量参数，混凝土覆盖层厚度和氯化物浓度建立钢筋腐蚀速率的回归模型。通过本工作获得的钢筋腐蚀速率回归模型以及文献中报道的混凝土强度和弹性模量模型适用于开发基于Microsoft耐久性的RC梁和混凝土耐久性优化设计的自动分析和设计方法。色谱柱在规定的氯化物暴露腐蚀性环境下使用。提出和讨论了从建议的最佳设计方法（针对腐蚀环境中的RC梁和柱）获得的示例结果。

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