In this study, the variation in the expansion displacement of concrete samples with different water-cement ratios under five corrosion solutions (single sulfate salt and coupled sulfate-chloride salt) is explored. The expansion displacement evolution of these concrete samples under sulfate corrosion (single salt corrosion) and sulfate-chloride corrosion (double salt corrosion) is comprehensively examined. The results reveal that the continuous accumulation of corrosion damage eventually manifests in the form of expansion displacement. Based on the experimental results and the chemical reaction rate equation of the delayed ettringite formation and Friedel’s salt generation, an evolution model of expansion force is established. According to this model and the Weibull distribution law of damage, a expansion displacement mechanics model is proposed to predict the expansion displacement behavior of concrete under sulfate corrosion as well as combined sulfate-chloride corrosion.

中文翻译：

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海水腐蚀下混凝土膨胀位移力学模型

本研究探讨了不同水灰比的混凝土样品在五种腐蚀溶液（单一硫酸盐和耦合硫酸盐-氯化物盐）下膨胀位移的变化。全面研究了这些混凝土样品在硫酸盐腐蚀（单盐腐蚀）和硫酸盐-氯化物腐蚀（复盐腐蚀）下的膨胀位移演化。结果表明，腐蚀损伤的不断积累最终以膨胀位移的形式表现出来。根据实验结果和延迟钙矾石形成和弗里德尔盐生成的化学反应速率方程，建立了膨胀力的演化模型。根据该模型和威布尔损伤分布规律，提出了膨胀位移力学模型来预测硫酸盐腐蚀以及硫酸盐-氯化物复合腐蚀下混凝土的膨胀位移行为。