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Updated: Jan 29, 2026

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污染ASR混凝土的化腐蚀性能:使用阻力变化和NT Build 492方法进行合分析

Tianxing Shi¹, Shami Nejadi¹, Harry Far¹

¹School of Civil and Environmental Engineering, University of Technology Sydney (UTS), Sydney, NSW 2007, Australia.

Materials (Basel, Switzerland)

|January 28, 2026

概括

混凝土中的-反应 (ASR) 会导致裂,但长期的凝形成可以减少化物运输. 这项研究表明,ASR最初加速腐蚀,但后来改进了孔隙结构,降低了化物迁移.

科学领域:

土木和材料工程土木和材料工程
混凝土的耐用性混凝土的耐用性
腐蚀科学腐蚀科学

背景情况:

-反应 (ASR) 是由反应性聚合物引起的混凝土有害膨胀.
化腐蚀 (CIC) 是钢筋混凝土退化的主要原因之一.
了解ASR对化物运输的影响对于预测混凝土结构使用寿命至关重要.

研究的目的:

研究ASR如何影响化物运输机制.
评估ASR和CIC对钢筋混凝土的联合影响.
描述ASR引起的微观结构变化及其对运输特性的影响.

主要方法:

用不同的聚合物造反应性和非反应性混凝土梁.
两个阶段的暴露:富含的浸泡诱导ASR,然后是印象电流CIC.
化物迁移测试 (NT BUILD 492),微结构分析 (SEM-EDS,TGA) 和电阻监测.

主要成果:

反应束显示出由于ASR增加的裂纹.
随着时间的推移,非平稳状态化物迁移系数 (Dnssm) 在ASR受影响的光束中显著降低 (47-56%的降低).
ASR导致Ca耗尽和C-{N,K) -S-H凝形成,提炼孔隙结构和密封裂.

结论:

ASR最初通过微裂变和降低电阻来加速腐蚀的开始.
在ASR裂内长期的凝沉积可以部分封闭运输通路.
在研究条件下,ASR可以导致化物迁移的长期减少,尽管最初的裂变.

关键词:

在ASR的恶化.化物诱导的腐蚀性能表现综合的恶化影响影响.

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