钢筋锈胀对混凝土构件保护层开裂影响的分析

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摘要 研究目的: 钢筋锈蚀产生的体积膨胀迫使混凝土保护层开裂,“加速”钢筋锈蚀锈胀,裂缝逐渐扩展、贯通直至结构失效的问题是土木工程长期关注的热点。现有混凝土细观研究鲜有考虑骨料级配、粒径等骨料参数因素和不同锈蚀方式下的多因素对比分析。基于此,本文通过设置不同钢筋锈胀过盈量表征均匀锈蚀和非均匀锈蚀,并结合CDP模型提取保护层表面产生裂缝时钢筋锈蚀率,研究骨料参数、保护层厚度、界面层强度对混凝土均匀和非均匀锈胀开裂时锈蚀率的影响。
研究结论: (1)随骨料级配、粒径增大或骨料含量降低,结构的耐久性也相应提高;(2)保护层厚度增大、界面层强度提高可减小试件中微裂缝数量和主裂缝长度,同时延缓保护层表面的开裂;(3)本研究结果可为钢筋混凝土结构设计提供有益参考。

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	李永珑
	张志强
	林迪睿
	龚睿凯

关键词 ：钢筋锈胀, 混凝土开裂, 随机骨料, 三相细观模型, 损伤塑性模型

Abstract：Research purposes: The volume expansion generated by the corrosion of reinforcement forces the concrete cover to crack, "accelerating" the corrosion expansion of reinforcement, and the crack gradually expands and penetrates until the struc-tural failure, which is a long-term concern of civil engineering. Few existing concrete meso-scale studies have considered aggregate gradation, particle size and other aggregate parameter factors and comparative multi-factor analysis under different corrosion modes. Based on this, this paper characterizes uniform and non-uniform corrosion by setting different reinforcement corrosion expansion excess and extracts the corrosion rate of reinforcements when cracks are generated on the surface of the concrete cover in combination with the CDP model. The effects of aggregate parameters, cover thickness and interfacial layer strength on the corrosion rate of uniform and non-uniform corrosion expansion cracking of concrete are investigated.
Research conclusions: (1) The durability of reinforced concrete improves with the raise of aggregate gradation and particle size and the decrease of aggregate content. (2) The increase of the cover thickness and the strength of the interface layer could reduce the number of micro cracks and the length of main cracks in the specimen, while delaying the cracking of the cover surface. (3) The research results can provide useful references for the design of reinforced concrete structures.

Key words： reinforcement corrosion expansion concrete cracking random aggregate three-phase meso-scale model damage plastic model

收稿日期: 2021-09-17

PACS:

YV213

基金资助:国家高铁联合基金(U1934213);国家自然科学基金(51878572)

作者简介: **李永珑,1973年出生,男,正高级工程师。

引用本文:

李永珑, 张志强, 林迪睿, 龚睿凯. 钢筋锈胀对混凝土构件保护层开裂影响的分析[J]. 铁道工程学报, 2022, 39(5): 73-79.
LI Yonglong, ZHANG Zhiqiang, LIN Dirui, GONG Ruikai. Analysis of the Influence of Reinforcement Corrosion Expansion on Cracking of Concrete Cover. Journal of Railway Engineering Society, 2022, 39(5): 73-79.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I5/73

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