Impact of Corrosion on the Bond Strength between Concrete and Rebar: A Systematic Review

Abstract

Corrosion of the reinforcement affects more than the cross-sectional area of the rebar. The volume of steel also increases due to expansive corrosion products, leading to the cracking, delamination, and spalling of concrete. As a result, the bond capacity between concrete and rebar is affected. Researchers have extensively examined the impact of corrosion on the bond strength between concrete and rebar to propose empirical, theoretical, or numerical predictive models. Therefore, research programs on this topic have increased rapidly in recent years. This article presents a systematic literature review to explore experimental methods, outcomes, and trends on this topic. The Web of Science search collected 84 relevant research articles through a rigorous selection. Key factors that affect bond strength degradation, including concrete cover, concrete strength, and stirrups, have been documented. However, a general model is still unavailable due to discrepancies caused by differences in testing methods to evaluate the effect of corrosion on bond strength. Furthermore, researchers attempted to clarify the degradation mechanism of bond strength affected by corrosion. As a result, new alternatives have been proposed to build a practical model to assess the bond strength deterioration of corroded structures.

Effect of different material constitutive models in estimating the residual moment capacity of RC beams subjected to natural corrosion

“…Interestingly, a better model was obtained by taking their ratio (C v /D o ). The transformation is consistent with previous work linking the C v /D o ratio to corrosion protection (Syll and Kanakubo, 2022).…”

“…The present results, to the authors' knowledge, is the first to incorporate the specimen length in estimating the theoretical moment capacity, demonstrating the ability of the models to account for pitting or localized corrosion in naturally corroded beams. steel bars against progressive damage, improves the confinement, and consequently increases the bond strength of concrete (Syll and Kanakubo, 2022), thus reducing the impact of corrosion on the integrity of the RC beam. The variable was still included in the regression analysis because it may still contribute to the accuracy of C f once added with other predictors, particularly with bar diameter.…”

“…The weak correlation may be due to the compensating effect of C v to C f . Increasing the C v protects the steel bars against progressive damage, improves the confinement, and consequently increases the bond strength of concrete (Syll and Kanakubo, 2022), thus reducing the impact of corrosion on the integrity of the RC beam. The variable was still included in the regression analysis because it may still contribute to the accuracy of C f once added with other predictors, particularly with bar diameter.…”

Study on the Effect of Additives on the Performance of Cement-Based Composite Anti-Corrosion Coatings for Steel Bars in Prefabricated Construction

“…For example, the steel bar in prefabricated components is susceptible to corrosion during production, storage, transportation, and installation. This not only results in significant economic losses but also destroys the bonding surface with the subsequently poured concrete and undermines the interlocking interaction between the reinforcement and the concrete, thereby leading to potential implications on overall structural load-bearing capacity and performance of buildings [6][7][8]. Therefore, addressing the issue of steel bars corrosion in prefabricated construction is of significant importance.…”

Durability of Reinforced Concrete with Additions of Natural Pozzolans of Volcanic Origin

“…Thus, Xia et al [ 14 ] found that the addition of natural pozzolans caused a decrease in the resistance to carbonation and a decrease in the diffusion coefficients of chlorides, parameters related to the corrosion of reinforced concrete, chloride being the main cause of reinforcement corrosion [ 44 , 45 ]. The corrosive process has arisen interest in the last decades because it has been identified as the main process related to the durability of reinforced concrete, which leads to great economic losses and, on the other hand, a huge environmental cost due to increased CO 2 emissions originated by the consumption of raw materials in the repair or replacement of damaged structures [ 46 , 47 ]. Although authors such as Kaid et al [ 48 ] and Fajardo et al [ 49 ] found that concrete mixed with natural pozzolan showed excellent corrosion resistance, quantification is necessary when these concretes are going to be used in areas with a high chloride content in the environment.…”