混凝土氯盐-硫酸盐耦合侵蚀机理、模型及数值模拟研究进展

摘要/Abstract

摘要： 服役于滨海和内陆盐渍土环境中的钢筋混凝土结构,易受氯盐和硫酸盐的耦合侵蚀,面临着较为突出的结构耐久性问题。目前关于单一氯盐或硫酸盐对钢筋混凝土的侵蚀过程已有较多试验与数值模型研究,而氯盐和硫酸盐耦合侵蚀的相关研究则相对有限。因此,本文归纳了国内外近几年的研究成果,探讨了单一盐侵蚀与氯盐-硫酸盐侵蚀的机理差异,讨论了硫酸根离子对氯离子传输速率和结合能力的影响规律;比较了现有关于氯盐-硫酸盐复合环境对钢筋混凝土的侵蚀模型,从离子传输过程、化学反应以及孔隙膨胀三个方面阐述了各侵蚀模型的构建流程,总结了目前应用的数值模拟方法。最后,评述了目前关于钢筋混凝土的氯盐-硫酸盐耦合侵蚀研究情况,并对后续研究作出了展望。

关键词: 混凝土, 氯盐, 硫酸盐, 耦合侵蚀, 数值模拟方法

Abstract: In coastal and inland saline soil environments, reinforced concrete structures are susceptible to coupling erosion of chloride-sulfate, and face more prominent structural durability problems. While experimental and numerical model research is abundant on the erosion process of reinforced concrete caused by either chloride or sulfate alone. Studies on the coupling erosion by chloride-sulfate are relatively limited. Hence, this paper summarizes the research achievements from recent years both domestically and internationally, explores the differences in the mechanism of single salt erosion and chloride-sulfate erosion, and discusses the influence of sulfate ion on the diffusion rate and binding capacity of chloride ion. The existing coupling models for reinforced concrete subjected to chloride-sulfate composite environment are compared, and the construction process of erosion models are elaborated from three aspects: the ionic transport process, chemical reaction, and pore expansion. The currently applied numerical simulation methods are summarized. Finally, the current research on chloride-sulfate coupling erosion of reinforced concrete is reviewed, and an outlook for subsequent research is given.

Key words: concrete, chloride, sulfate, coupling erosion, numerical simulation method

中图分类号:

TU528

李国满, 李浩然, 邱国斌, 黎俊伶, 张瑞. 混凝土氯盐-硫酸盐耦合侵蚀机理、模型及数值模拟研究进展[J]. 硅酸盐通报, 2024, 43(11): 3935-3946.

LI Guoman, LI Haoran, QIU Guobin, LI Junling, ZHANG Rui. Research Progress on Chloride-Sulfate Coupling Erosion Mechanism, Model and Numerical Simulation of Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 3935-3946.

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