Time-dependent nonuniform numerical model of corrosion process and consequent corrosion-induced concrete cracking under chloride attack

Corrosion of steel bars and consequent concrete cracking are complicated processes and they mutually affect one another. In this study, a 3D time-dependent numerical model was developed to simulate localised corrosion in both circumferential and longitudinal directions, incorporating effects of nonu...

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Main Authors: Bui, Huy Tang, Tan, Kang Hai
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/170253
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1702532023-09-05T01:49:50Z Time-dependent nonuniform numerical model of corrosion process and consequent corrosion-induced concrete cracking under chloride attack Bui, Huy Tang Tan, Kang Hai School of Civil and Environmental Engineering Engineering::Civil engineering Corrosion-Induced Cracks Time-Dependent Corrosion of steel bars and consequent concrete cracking are complicated processes and they mutually affect one another. In this study, a 3D time-dependent numerical model was developed to simulate localised corrosion in both circumferential and longitudinal directions, incorporating effects of nonuniform corrosion-induced cracks. Time-dependent evolution of corroded area in the circumferential direction around the steel bar was calculated as a function of chloride concentration, while two configurations of corroded length along the steel bar axis were simulated: (1) the entire length of steel bar was corroded at the same time and (2) the corroded length progressively developed from the middle of the bar towards its two ends. Microcell and macrocell mechanisms were applied to determine the total corrosion rate. Consequently, a finite element model was developed to simulate nonuniform corrosion-induced concrete cracking. It was found that once a vertical crack propagated through the concrete cover, not only did the corroded area spread faster, microcell and macrocell current densities also substantially increased, and the shape of corroded depth became more rounded. Ministry of National Development (MND) National Research Foundation (NRF) This research is supported by the National Research Foundation, Singapore, and Ministry of National Development, Singapore, under its Cities of Tomorrow R&D Programme (CoT Award No. COT-V2-2019-1). 2023-09-05T01:49:50Z 2023-09-05T01:49:50Z 2023 Journal Article Bui, H. T. & Tan, K. H. (2023). Time-dependent nonuniform numerical model of corrosion process and consequent corrosion-induced concrete cracking under chloride attack. Structures, 52, 332-347. https://dx.doi.org/10.1016/j.istruc.2023.03.113 2352-0124 https://hdl.handle.net/10356/170253 10.1016/j.istruc.2023.03.113 2-s2.0-85151615370 52 332 347 en COT-V2-2019-1 Structures © 2023 Institution of Structural Engineers. Published by Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Corrosion-Induced Cracks
Time-Dependent
spellingShingle Engineering::Civil engineering
Corrosion-Induced Cracks
Time-Dependent
Bui, Huy Tang
Tan, Kang Hai
Time-dependent nonuniform numerical model of corrosion process and consequent corrosion-induced concrete cracking under chloride attack
description Corrosion of steel bars and consequent concrete cracking are complicated processes and they mutually affect one another. In this study, a 3D time-dependent numerical model was developed to simulate localised corrosion in both circumferential and longitudinal directions, incorporating effects of nonuniform corrosion-induced cracks. Time-dependent evolution of corroded area in the circumferential direction around the steel bar was calculated as a function of chloride concentration, while two configurations of corroded length along the steel bar axis were simulated: (1) the entire length of steel bar was corroded at the same time and (2) the corroded length progressively developed from the middle of the bar towards its two ends. Microcell and macrocell mechanisms were applied to determine the total corrosion rate. Consequently, a finite element model was developed to simulate nonuniform corrosion-induced concrete cracking. It was found that once a vertical crack propagated through the concrete cover, not only did the corroded area spread faster, microcell and macrocell current densities also substantially increased, and the shape of corroded depth became more rounded.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Bui, Huy Tang
Tan, Kang Hai
format Article
author Bui, Huy Tang
Tan, Kang Hai
author_sort Bui, Huy Tang
title Time-dependent nonuniform numerical model of corrosion process and consequent corrosion-induced concrete cracking under chloride attack
title_short Time-dependent nonuniform numerical model of corrosion process and consequent corrosion-induced concrete cracking under chloride attack
title_full Time-dependent nonuniform numerical model of corrosion process and consequent corrosion-induced concrete cracking under chloride attack
title_fullStr Time-dependent nonuniform numerical model of corrosion process and consequent corrosion-induced concrete cracking under chloride attack
title_full_unstemmed Time-dependent nonuniform numerical model of corrosion process and consequent corrosion-induced concrete cracking under chloride attack
title_sort time-dependent nonuniform numerical model of corrosion process and consequent corrosion-induced concrete cracking under chloride attack
publishDate 2023
url https://hdl.handle.net/10356/170253
_version_ 1779156574400413696