Unraveling the Stray Current-Induced Interfacial Transition Zone (ITZ) Effect on Sulfate Corrosion in Concrete

IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Engineering Pub Date : 2024-10-01 DOI:10.1016/j.eng.2024.08.001
Yong-Qing Chen , Lin-Ya Liu , Da-Wei Huang , Qing-Song Feng , Ren-Peng Chen , Xin Kang
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Abstract

The rail transit in sulfate-rich areas faces the combined effects of stray current and salt corrosion; however, the sulfate ion transport and concrete degradation mechanisms under such conditions are still unclear. To address this issue, novel sulfate transport and mesoscale splitting tests were designed, with a focus on considering the differences between the interfacial transition zone (ITZ) and cement matrix. Under the influence of stray current, the ITZ played a pivotal role in regulating the transport and mechanical failure processes of sulfate attack, while the tortuous and blocking effects of aggregates almost disappeared. This phenomenon was termed the “stray current-induced ITZ effect.” The experimental data revealed that the difference in sulfate ion transport attributed to the ITZ ranged from 1.90 to 2.31 times, while the difference in splitting strength ranged from 1.56 to 1.64 times. Through the real-time synchronization of splitting experiments and microsecond-responsive particle image velocimetry (PIV) technology, the mechanical properties were exposed to the consequences of the stray current-induced ITZ effect. The number of splitting cracks in the concrete increased, rather than along the central axis, which was significantly different from the conditions without stray current and the ideal Brazilian disk test. Furthermore, a sulfate ion mass transfer model that incorporates reactivity and electrodiffusion was meticulously constructed. The embedded finite element calculation exhibited excellent agreement with the experimental results, indicating its reliability and accuracy. Additionally, the stress field was determined utilizing analytical methods, and the mechanism underlying crack propagation was successfully obtained. Compared to the cement matrix, a stray current led to more sulfates, more microstructure degradation, and greater increases in thickness and porosity in the ITZ, which was considered to be the essence of the stray current-induced ITZ effect.
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揭示杂散电流引发的界面过渡区 (ITZ) 对混凝土硫酸盐腐蚀的影响
富含硫酸盐地区的轨道交通面临着杂散电流和盐腐蚀的双重影响;然而,这种条件下的硫酸根离子迁移和混凝土降解机制仍不清楚。针对这一问题,我们设计了新型硫酸盐迁移和中尺度分裂试验,重点考虑了界面过渡区(ITZ)和水泥基质之间的差异。在杂散电流的影响下,ITZ 在调节硫酸盐侵蚀的传输和机械破坏过程中发挥了关键作用,而集料的迂回和阻挡作用几乎消失。这种现象被称为 "杂散电流诱导的 ITZ 效应"。实验数据显示,ITZ 导致的硫酸根离子传输差异为 1.90 至 2.31 倍,而分裂强度差异为 1.56 至 1.64 倍。通过实时同步劈裂实验和微秒响应粒子图像测速(PIV)技术,力学性能暴露了杂散电流引起的 ITZ 效应的后果。混凝土中劈裂裂缝的数量增加了,而不是沿着中心轴线,这与没有杂散电流的条件和理想的巴西盘试验有明显不同。此外,还精心构建了一个包含反应性和电扩散的硫酸根离子传质模型。嵌入式有限元计算与实验结果非常吻合,表明其可靠性和准确性。此外,还利用分析方法确定了应力场,并成功获得了裂纹扩展的基本机制。与水泥基体相比,杂散电流导致 ITZ 中硫酸盐含量更高、微观结构退化更严重、厚度和孔隙率增加更大,这被认为是杂散电流诱导 ITZ 效应的本质。
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来源期刊
Engineering
Engineering Environmental Science-Environmental Engineering
自引率
1.60%
发文量
335
审稿时长
35 days
期刊介绍: Engineering, an international open-access journal initiated by the Chinese Academy of Engineering (CAE) in 2015, serves as a distinguished platform for disseminating cutting-edge advancements in engineering R&D, sharing major research outputs, and highlighting key achievements worldwide. The journal's objectives encompass reporting progress in engineering science, fostering discussions on hot topics, addressing areas of interest, challenges, and prospects in engineering development, while considering human and environmental well-being and ethics in engineering. It aims to inspire breakthroughs and innovations with profound economic and social significance, propelling them to advanced international standards and transforming them into a new productive force. Ultimately, this endeavor seeks to bring about positive changes globally, benefit humanity, and shape a new future.
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