黏结长度对锈蚀钢筋与混凝土间黏结性能的影响

doi:10.11896/cldb.18110090

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Abstract Aiming at digging out the impact of anchorage length (L) of steel bar on bond performance between corroded reinforcing steel bars and concrete, two kinds of cube specimens with different anchorage length (L=2d and L=5d, d is the diameter of rebar) were cast. Six groups of pull-out specimens with rebar mass loss percentage of 0.0%, 1.0%, 2.0%, 5.0%, 8.0%, 10.0% were prepared by means of current accele-rated method, and the maximum width of corrosion-induced cracking on these specimens was measured by fracture width gauge. According to the pull-out tests, the degradation laws of bonding performance between the corroded reinforcing steel bar and concrete were analyzed, conside-ring the influence of anchorage length and reinforcement corrosion rate. The experimental results showed that the expansive cracks in the specimen with longer anchorage length appeared earlier and the maximum crack width became larger because of the increased reinforcement corrosion level. The deterioration of concrete and the increase of corrosion rate would bring about an increase and then gradual decrease in bonding strength and initial bonding stiffness of specimens with diverse anchorage length. Additionally, the growing mass loss of rebars also leaded to the decline of bonding energy. The specimens with longer anchorage length (L=5d) held lower bond strength and bond stiffness than the specimens with shorter anchorage length (L=2d). Finally, an empirical model for predicting corrosion-induced cracking width based on reinforcement corrosion level was proposed, and the relationship between bond strength and corrosion level based on the tested results of previous studies was established, which can evaluate the residual bond strength with different corrosion levels.

Key words： anchorage length corroded steel bar concrete bond performance corrosion-induced cracks

Published: 16 September 2019

CLC number:

TU375.4

Fund:This work was financially supported by the National Natural Science Foundation of China (51578229), the Major Science and Technology Projects in Hunan Province (2017SK1010) and the Innovative Technology Investment Project in Hunan Province (2018GK5028).

About author:: Jun Chen received his Ph.D. degree in June 2016 from Hunan Univerisity of Technology in engineering. He is currently an associate professor in Xiangtan Uni-verisity and his research interests are structural seismic performance, high temperature performance and conti-nuous collapse resistance.
Bai Zhangreceived his M.E. degree in June 2018 from Xiangtan University of Technology in engineering. In September 2018, he is studying for his Ph.D. degree at the school of Civil Engineering, Southeast University, focusing on the research of structural fire resis-tance and durability.

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	CHEN Jun
	ZHANG Bai
	YANG Ou
	LONG Shiguo
	XU Fu
	YANG Caiqian

Cite this article:

CHEN Jun,ZHANG Bai,YANG Ou, et al. Impact of Anchorage Length on Bond Performance Between Corroded Reinforcing Steel Bars and Concrete[J]. Materials Reports, 2019, 33(22): 3744-3751.

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http://www.mater-rep.com/EN/10.11896/cldb.18110090 OR http://www.mater-rep.com/EN/Y2019/V33/I22/3744

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