Numerical Investigation on Lateral Confinement Effects on Concrete Cracking Induced by Rebar Corrosion.

Gyeongcheol Choe,Yasuji Shinohara,Jeongsoo Nam,Gyuyong Kim

doi:10.3390/ma13051156

Gyeongcheol Choe, Yasuji Shinohara + Show 2 more

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https://doi.org/10.3390/ma13051156

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Abstract

Accelerated corrosion tests of reinforced concrete (RC) specimens were conducted to estimate the corrosion expansion rate of reinforcing bars. Subsequently, finite element analysis was performed with the estimated expansion rate for RC beams to investigate concrete cracking induced by corrosion. The influence of the different confinement levels on crack behavior was investigated using mainly the amount of transverse reinforcement. An expansion rate of 2 was found to be appropriate when using Lundgren’s expansion model. Confinement levels affected the cracking behavior of steel bars. Cracks did not significantly affect structural capacity although they exceeded the allowable crack width. Nevertheless, repair and reinforcement measures are necessary because degrading durability factors such as carbonation or salt diffusion can reach the reinforcing bars through connected cracks.

Highlights

The design of reinforced concrete (RC) structures requires the consideration of durability in terms of sustainable use, as well as maximum strength for safe structural performance
Cracking occurs when the tensile stress exceeds the tensile strength of the concrete. concrete cracking induced by corrosion in RC has a significant impact on the serviceability and durability of RC structures, which may cause structural damage such as the reduction of bond strength and the spalling of concrete cover
12 shows the typical concrete cracking induced by corrosion and transverse reinforcement stress for each step of corrosion

Summary

Introduction

The design of reinforced concrete (RC) structures requires the consideration of durability in terms of sustainable use, as well as maximum strength for safe structural performance. Steel corrosion has a significant influence on the serviceability and durability of RC structures [4,5,6,7]. Steel corrosion leads to critical deterioration, such as cracking or cover spalling of RC structures, because corrosion products occupy more than 2–6 times the volume of the original steel [8]. Steel corrosion can result in pressure expansion, leading to tensile stress in the concrete surrounding the steel bars [7,9]. Concrete cracking induced by corrosion in RC has a significant impact on the serviceability and durability of RC structures, which may cause structural damage such as the reduction of bond strength and the spalling of concrete cover. It is very important to investigate concrete cracking induced by corrosion in order to achieve suitable maintenance control for RC structures [8,9,10]

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