钢筋混凝土界面锈峰三维建模及保护层开裂预测

姜策; 张小刚; 赵小也; 徐平贵

doi:10.3724/j.gyjzG24111501

钢筋混凝土界面锈峰三维建模及保护层开裂预测

doi: 10.3724/j.gyjzG24111501

深圳大学土木与交通工程学院, 广东深圳 518061

详细信息

作者简介:
姜策,博士研究生,主要从事混凝土结构耐久性研究,jctc1234@qq.com。

通讯作者:
张小刚,博士,教授,主要从事混凝土结构安全性与耐久性研究,bszxg@126.com。

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出版历程
- 收稿日期: 2024-11-15
- 网络出版日期: 2026-06-06
- 刊出日期: 2026-04-20

Three-Dimensional Modeling of Rust Peaks at the Steel-Concrete Interface and Prediction of Cover Cracking

College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518061, China

摘要

摘要: 钢筋锈蚀是滨海地区钢筋混凝土结构劣化的主要驱动因素。为探明钢筋锈蚀引发保护层开裂的机制，聚焦于钢筋-混凝土界面的自然缺陷导致的局部锈蚀产物聚集现象（锈峰），采用微型计算机断层扫描（μCT）技术，三维无损追踪并量化了钢筋-混凝土界面的锈峰形态，提出基于二维高斯函数的三维锈峰拟合模型，并通过试验数据验证其准确性。基于此模型，分析了锈峰与界面缺陷之间的关系，建立了锈胀诱发保护层开裂的预测模型。结果表明，裂缝宽度随锈峰高度增加而显著扩展，且保护层较薄的样品更易发生明显裂缝。该模型在实验室条件下表现出较高的预测精度，预测误差多在15%以内。研究成果为工程中钢筋锈蚀导致的结构劣化提供了理论支撑，但在复杂环境中的适用性仍有待进一步验证。
- 钢筋锈蚀 /
- 保护层开裂 /
- μCT /
- 三维锈峰建模 /
- 耐久性评估
Abstract: Rebar corrosion is a leading cause of degradation in reinforced concrete （RC） structures， particularly in coastal environments. This study investigated the corrosion-induced cracking mechanism of concrete cover， focusing on the localized accumulation of corrosion products （rust peaks） at the steel-concrete interface due to inherent defects. Micro-computed tomography （μCT） was employed to perform a non-destructive， three-dimensional analysis of rust peaks forming at the steel-concrete interface. A three-dimensional rust peak fitting model based on a two-dimensional Gaussian function was proposed， and its accuracy was verified with experimental data. Based on this model， the relations between rust peaks and natural interface defects were examined， and a corrosion-induced cracking model for the cover was established. The findings revealed that the crack width increased significantly with the growth of rust peak height， and specimens with thinner concrete cover were more prone to developing distinct cracks. The model demonstrated high prediction accuracy in laboratory testing， with most prediction errors remaining within 15%. These results provide theoretical support for understanding structural degradation induced by rebar corrosion in engineering practice， although their applicability in complex environments still requires further verification.
- rebar corrosion /
- cover cracking /
- μCT /
- three-dimensional rust peak model /
- durability assessment

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