Materials Reports 2019, Vol. 33 Issue (Z2): 309-316 |
INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Effect of Corrosion Rate of Steel Bar on Bond Performance Between Steel Barand Concrete |
WANG Zhaoyang1,2, ZHOU Quan1, YANG Ou2, HUO Jingsi2,3, WANG Haitao2
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1 China Southwest Architectural Design and Research Institute Corp., Ltd., Hunan Branch, Changsha 410008; 2 China Ministry of Education Key Laboratory of Building Safety and Energy Efficiency, College of Civil Engineering, Hunan University, Changsha 410082; 3 College of Civil Engineering, Huaqiao University, Xiamen 361021 |
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Abstract To investigate the influence of corrosion of steel bar on the bonding performance between steel bar and concrete, 24 central pull-out test spe-cimens as well as other 6 specimens for compressive strength were cast. Pull-out test were conducted to study the bond behavior between concrete and steel bar which was corroded using current accelerate method to control corrosion with the expected corrosion rate of 0%,0.3%,0.5%,1%,2%,5%,8%,15%.The influence of corrosion rate on bond stiffness was studied by method of secant stiffness.The influence of corrosion on work of pull-out force before peak slip was also studied.A simplified three-stage test method and constitutive model of bond strength degeneration were proposed.Furthermore,a three-stage bond-slip constitutive relation was proposed considering influence of corrosion on residual bond strength. The test results show that degradation speed of bond stiffness between concrete and rebar can be divided into two stages after reaching peak.The work of pull-out force before peak slip decline at the beginning then increase and finally decrease with corrosion increasing.
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Published: 25 November 2019
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Fund:This work was financially supported by the National Natural Science Foundation of China (51578229). |
About author:: Zhaoyang Wang received his M. E. degree of engineering in June 2018 from Hunan University. Since July 2018, he has been mainly engaged in structural design, ultra limit complicated structure and node analysis at the China Southwest Architectural Design and Research Institute Corp., Ltd. Ou Yang received his Ph. D. degree of engineering in October 2010 from Harbin Institute of Technology. He is currently an associate professor in Hunan University and his research interests are mechanical properties of corroded reinforced concrete structures and evaluation of fatigue damage performance of reinforced concrete members. |
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