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Durability and Integrity of Reinforced Concrete Structures under Corrosion

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A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Civil Engineering".

Deadline for manuscript submissions: closed (20 March 2022) | Viewed by 6596

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Special Issue Editors

Prof. Dr. Charis Apostolopoulos

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Laboratory of Technology & Strength of Materials, Department of Mechanical Engineering and Aeronautics, University of Patras, Patras, Greece
Interests: corrosion of reinforced concrete structures; durability and sustainability of constructions; mechanical behavior of materials; building materials
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Alexandros Katsaounis

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Guest Editor

Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
Interests: heterogeneous catalysis; electrocatalysis; electrochemistry; chemical and electrochemical processes
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the new era of sustainable development, durability is a fundamental criterion in the design of reinforced concrete (RC) structures, whereas the majority of the existing building stock presents vulnerabilities due either to the quality of materials or environmental conditions. The corrosion of steel reinforcements is identified as the major degradation factor of RC structures in the long term, with remarkable multifaceted adverse effects which lead to degradation of the serviceability and bearing capacity. In recent decades, significant research has been conducted in order to investigate and quantify the corrosion consequences on reinforced concrete, and there is a growing need for reliable methods of assessing the bearing capacity and remaining service life of corroded structures. In the current international regulations and standards, efforts have been made to factor in corrosion and its impact. Similarly, guidelines are provided on methods for protection of RC structures, through cathodic protection or corrosion inhibitors, and on estimation of the corrosion level of damaged structures and their remaining lifetime.

This Special Issue of Applied Sciences aims to add evidence to the scientific progress achieved through research in assessing the corrosion damage of reinforced structures.

Topics to be covered in this Special Issue include:

Monitoring of corrosion level via surface concrete cracking
Measurement of critical chloride concentration in the laboratory and on site
Assessment of corroded RC structures
Modeling the corrosive factor in RC elements
Coatings to enhance durability of structures exposed to chloride-induced corrosion
Bond-slip degradation due to corrosion
Case studies and applications

Prof. Dr. Charis Apostolopoulos
Prof. Dr. Alexandros Katsaounis
Guest Editors

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Published Papers (2 papers)

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Research

22 pages, 8356 KiB

Open AccessArticle

Effect of Corrosion on the Hysteretic Behavior of Steel Reinforcing Bars and Corroded RC Columns

by Maria Basdeki, Konstantinos Koulouris and Charis Apostolopoulos

Appl. Sci. 2022, 12(15), 7451; https://doi.org/10.3390/app12157451 - 25 Jul 2022

Cited by 5 | Viewed by 2484

Abstract

The corrosion of steel reinforcement negatively influences the mechanical performance of reinforced concrete (RC) elements reducing both their strength capacity and ductility. Especially in seismic prone areas, the degradation of the cyclic behavior of corroded RC elements is more intense, limiting the service life of structures and leading to premature failures. In the present paper, in order to study the degraded behavior of the embedded (in concrete) steel reinforcement under cyclic loading, laboratory corrosion experiments were performed on embedded steel reinforcing bars. Thereafter, mechanical tests under dynamic loadings with gradually increased deformations were carried out. From the experimental study, hysteretic models of the non-linear behavior of steel bars were extracted in non-corroded and corroded conditions, in the case of both uniform and pitting corrosion. Based on the hysteretic models of steel bars, an analysis of the cyclic response of (non-corroded and corroded) RC columns was performed using the OpenSees code. The outcomes of the present study indicated the negative consequences of corrosion on the hysteretic behavior of steel reinforcing bars, demonstrating mainly the local reduction in their cross-section (pitting corrosion) combined with the loading history and buckling phenomena as the main factors which deviate the mechanical behavior of steel bars from the classic bilinear model of monotonic loading. Full article

(This article belongs to the Special Issue Durability and Integrity of Reinforced Concrete Structures under Corrosion)

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24 pages, 8646 KiB

Open AccessArticle

Structural Performance Degradation of Corrosion-Damaged Reinforced Concrete Beams Based on Finite Element Analysis

by Ju-Seong Jung, Jae-Won Jeong and Kang-Seok Lee

Appl. Sci. 2022, 12(4), 2090; https://doi.org/10.3390/app12042090 - 17 Feb 2022

Cited by 1 | Viewed by 3553

Abstract

The impact of the seismic performance of corrosion-damaged reinforced concrete (RC) members on the overall seismic performance of the entire RC structure must be investigated. Related research results provide important guidance for a more accurate seismic performance evaluation of RC structures with corroded members including beams and columns. However, currently available technologies for the seismic evaluation of existing RC structures do not consider the impact of reinforcement corrosion-induced deterioration on the seismic performance of RC members. The main focus of this study is on proposing a practical methodology to evaluate the seismic performance of such buildings. More specifically, the proposed methodology enables a direct quantitative evaluation of seismic performance by estimating the structural performance based on the strength and deformation capacity of corroded members. In pursuit of this research background and the objectives, our research team first performed an experimental study to estimate the impact of reinforcement corrosion on the structural behavior of RC shear beams and flexural beams and determine the factors associated with structural performance deterioration. A high correlation between the half-cell potential (HCP) before and after reinforcement corrosion of RC beams and the structural performance degradation factor based on the energy absorption capacity has been seen previously. In this study, a finite element analysis (FEA) was conducted, in which bond strength loss between rebar and concrete due to reinforcement corrosion of beam members was considered as one of the aging-related degradation factors, and the correlation between structural performance degradation before and after corrosion in beam members was studied. In addition, we compared and analyzed the results of the previous experimental research and FEA conducted in this study and proposed a structural performance degradation factor as a function of corrosion of shear and flexural beams. The research results indicate that the FEA-derived bonding factor (β) and performance degradation factor (ϕ) of flexural beam can be approximated with the equation

ϕ = {(0.36 - β)}^{- 1} + 101

(R² = 0.94), together with β–mV (average potential difference in voltage) correlation

mV = (1.36 - β) / (0.018 - 0.05 β)

. In the case of shear beams, FEA resulted in

ϕ = 37.3 β + 63

, which enables regression approximation, showing a high correlation (R² = 0.98), together with β–mV correlation (

mV = 932.5 β - 1075

). Using the mV–β–ϕ correlation curves, the bonding factor (β) depending on the degree of corrosion of RC beam members and the performance degradation factor (ϕ) based on the consequent strength-deformation capacity can be evaluated. Full article