Chloride Ion Transport in Concrete Subjected to Sustained Compressive Stress Under Different Dry-Wet Ratios.

IF 3.2 3区 材料科学 Q3 CHEMISTRY, PHYSICAL
Materials Pub Date : 2025-09-19 DOI:10.3390/ma18184388
Wenqi Ma, Renchi Zhang, Xiang Li, Xiaokang Cheng, Yongming Xiong
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Abstract

Existing studies on chloride ion transport in concrete under compressive load had rarely incorporated the influence of the dry-wet time ratio, even though this ratio was a key factor affecting chloride penetration in coastal concrete structures subjected to periodic drying-wetting cycles. This study was therefore motivated to fill this gap and to provide more reliable theoretical support for the durability assessment of such engineering structures. A series of accelerated chloride ion penetration experiments was conducted on concrete under compressive load with different dry-wet time ratios. The effects of the dry-wet time ratio, compressive stress level, and exposure environment on chloride ion transport in concrete were analyzed. A chloride ion diffusion coefficient model that accounted for both the dry-wet time ratio and the compressive stress level was then established and validated. The results showed that the enhancing effect of the dry-wet time ratio on chloride ion transport became significant under relatively high compressive stress. When the dry-wet time ratio was 7:1, the convection zone depths of concrete specimens under no stress and compressive stress were both 5 mm. Moreover, when the compressive stress level was 0.5 times the compressive strength and the dry-wet time ratio was 7:1, the chloride concentration of the specimens increased by an average of 756.4% compared with that under natural immersion.

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不同干湿比下经受持续压应力的混凝土中氯离子的输运。
尽管干湿时间比是影响氯离子在周期性干湿循环的沿海混凝土结构中渗透的关键因素,但现有的压缩荷载作用下混凝土中氯离子输运的研究很少考虑干湿时间比的影响。因此,本研究旨在填补这一空白,为此类工程结构的耐久性评估提供更可靠的理论支持。在不同干湿时间比的压载条件下,对混凝土进行了氯离子加速渗透试验。分析了干湿时间比、压应力水平和暴露环境对混凝土氯离子输运的影响。建立了兼顾干湿时间比和压应力水平的氯离子扩散系数模型并进行了验证。结果表明,在较高的压应力条件下,干湿时间比对氯离子输运的增强作用更为显著。干湿时间比为7:1时,无应力和压应力作用下混凝土试件的对流区深度均为5mm。当压应力水平为抗压强度的0.5倍,干湿时间比为7:1时,试样的氯离子浓度比自然浸泡时平均提高756.4%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Materials
Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
5.80
自引率
14.70%
发文量
7753
审稿时长
1.2 months
期刊介绍: Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.
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