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Analytical model for residual bond strength of corroded reinforcement in concrete structures

Analytical model for residual bond strength of corroded reinforcement in concrete structures

Chen, Hua-Peng and Nepal, Jaya (2015) Analytical model for residual bond strength of corroded reinforcement in concrete structures. Journal of Engineering Mechanics. ISSN 0733-9399 (Print), 1943-7889 (Online) (doi:10.1061/(ASCE)EM.1943-7889.0000997)

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Abstract

Bond strength deterioration in corrosion-damaged reinforced concrete structures significantly affects serviceability and load-carrying capacity in their remaining service life. This paper presents a new analytical model for predicting the cracking development in the surrounding concrete and the residual bond strength of rebar in concrete structures due to reinforcement corrosion. The proposed analytical method adopts the thick-walled cylinder model for the cover concrete and considers the realistic properties of the corrosion-induced cracked concrete such as anisotropic behavior, residual tensile strength, and reduced tensile stiffness. As corrosion progresses, three phases for bond strength evolution associated with concrete cracking development are defined and the corresponding corrosion levels in each phase are determined. By using the constructed new governing equation, the crack width growth in the concrete cover and the radial bursting pressure at the bond interface are evaluated. The ultimate bond strength is then estimated from the contributions of adhesion, confinement, and corrosion pressure as a function of corrosion level. Finally, the effectiveness of the proposed analytical model is demonstrated by comparing the predicted results with experimental data available, and the results show that the proposed model is useful for predicting the bond strength evolution of the corroded rebar in concrete structures.

Item Type: Article
Uncontrolled Keywords: Corrosion, Concrete, Cracking, Bonding strength
Subjects: T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TH Building construction
Faculty / Department / Research Group: Faculty of Engineering & Science
Last Modified: 18 Apr 2017 14:36
Selected for GREAT 2016: GREAT a
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/13943

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