钢筋锈胀对混凝土构件保护层开裂影响的分析

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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

Received: 17 September 2021

PACS:

YV213

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	Articles by authors
	LI Yonglong
	ZHANG Zhiqiang
	LIN Dirui
	GONG Ruikai

Cite this article:

LI Yonglong,ZHANG Zhiqiang,LIN Dirui, et al. Analysis of the Influence of Reinforcement Corrosion Expansion on Cracking of Concrete Cover[J]. Journal of Railway Engineering Society, 2022, 39(5): 73-79.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I5/73

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