Abstract

An analytical model that describes the deterioration of bond strength, due to corrosion of steel reinforcement, at the steel-concrete interface in a reinforced concrete is developed. Concrete is assumed as a thick-walled cylinder subjected to internal pressure exerted from the growth of corrosion products on the concrete at the steel-concrete interface. The concrete in the inner cylinder is considered as an anisotropic material with stiffness degradation factor as an exponential function, while at the outer cylinder, the concrete is treated as an isotropic material. A frictional model is used to combine the action of confining pressure resulted from radial pressure produced by principal bar ribs on surrounding concrete, and corrosion pressure resulted from the expansion of corrosion products. The results of the proposed model are validated with experimental results by several researchers and a good agreement was noted; this shows that the derived analytical model was able to satisfactory [sic] predict the reduction of bond strength between steel and concrete.

Highlights

  • IntroductionBond between reinforcing steel bar and surrounding concrete is necessary to ensure composite action of the two materials, and the load transfers between steel and concrete is required to maintain this composite action

  • One of the major degradation processes of reinforced concrete structures is the corrosion of the steel reinforcement

  • The corrosion problem of the build infrastructure has a significant impact on the economy, according to a study done by the Federal Highway Administration (FHWA) by Koch et al (2001) on the total direct cost of corrosion in the U.S, which is estimated at $267 billion per year, which is equivalent to 3.1% of the U.S gross national product (GNP)

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Summary

Introduction

Bond between reinforcing steel bar and surrounding concrete is necessary to ensure composite action of the two materials, and the load transfers between steel and concrete is required to maintain this composite action. Especially with severe localized corrosion, causes a significant reduction of the interlocking phenomenon between the ribs and the concrete keys due to the deterioration of the reinforcing bar ribs. This reduction of the interlocking between the reinforcing bar and the concrete, retards the primary mechanism of the bond in deformed bars, which is the transfer of forces by mechanical interlocking of the ribs, and the bond strength decreases significantly. A better understanding of the mechanism through which corrosion affects bond is necessary to enable the controlling factors to be better understood, to resolve the apparent inconsistencies between different studies, and to enable effective models to be developed

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