An Experimental Investigation into the Effect of Transverse Reinforcement Corrosion on Compressive Strength Reduction in
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RESEARCH PAPER
An Experimental Investigation into the Effect of Transverse Reinforcement Corrosion on Compressive Strength Reduction in Spirally Confined Concrete Jamal Ahmadi1 · Mohsen Ali Shayanfar2 · Mohammad Ghanooni‑Bagha3 · Kiarash Nasserasadi1 · Ali Goharrokhi1 Received: 12 June 2019 / Accepted: 27 December 2019 © Shiraz University 2020
Abstract Due to a small concrete cover of spiral reinforcements compared with longitudinal rebars, the corrosion of spiral reinforcements becomes earlier and more severe, leading to cracks in concrete, a decrease in confinement, an intensification of reduction in deformation capacity and ductility of reinforced concrete structures. To assess the amount of reduction in the capacity of reinforced concrete specimens in different corrosion degrees, forty-four standard cylindrical specimens with and without reinforcements are prepared to conduct an experimental investigation. The test variables include the corrosion percentage, spiral diameter, spiral pitch, and confined core diameter. Based on the experimental observations regarding the effects of corrosion on the spiral reinforcements, functional relationships associated with the compressive strength of reinforced concrete are proposed to indicate the strength of corroded reinforced concrete with respect to the strength of non-corroded reinforced concrete. The main functionality of the proposed relationships is to utilize them in order to estimate the residual strength of reinforced concrete with corroded spiral reinforcements for the rehabilitation and retrofitting of reinforced concrete structures. Results of the experimental investigation demonstrate that the corrosion up to 2.5% has a more significant effect on the reduction in confinement strength, and smaller-sized spiral reinforcements are less sensitive to corrosion. Keywords Spiral · Corrosion · Confinement · Compressive strength · Concrete cover
1 Introduction
* Jamal Ahmadi [email protected] Mohsen Ali Shayanfar [email protected] Mohammad Ghanooni‑Bagha [email protected] Kiarash Nasserasadi [email protected] Ali Goharrokhi [email protected] 1
Department of Civil Engineering, Zanjan University, Zanjan, Iran
2
School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
3
Department of Civil Engineering, East Tehran Branch, Islamic Azad University, Tehran, Iran
Corrosion of concrete and reinforcements is one of the most significant threats in concrete structures. In most cases, the structures constructed in coastal and warm areas are prone to damage from corrosive factors in such a way that ignoring these effects causes inappropriate consequences (Morcous et al. 2010; Palsson and Mirza 2002; Ghanooni-Bagha et al. 2016; Amjad et al. 2015). In this regard, several experimental observations indicated that the corrosion of reinforcements plays an essential role in reducing the strength of reinforced concrete structures (Salari and Spacone 2001; Chen and Baker 2003; Zou et al. 2014). Because the diamete
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