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Explosive Spalling Behavior of Single-Sided Heated Concrete According to Compressive Strength and Heating Rate

In this study, the effects of heating rate and compressive strength on the spalling behavior of single-sided heated ring-restrained concrete with compressive strengths of 60 and 100 MPa were investigated. The vapor pressure and restrained stress inside the concrete were evaluated under fast- and slo...

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Autores principales: Hwang, Euichul, Kim, Gyuyong, Choe, Gyeongcheol, Yoon, Minho, Son, Minjae, Suh, Dongkyun, Eu, Hamin, Nam, Jeongsoo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8541664/
https://www.ncbi.nlm.nih.gov/pubmed/34683616
http://dx.doi.org/10.3390/ma14206023
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author Hwang, Euichul
Kim, Gyuyong
Choe, Gyeongcheol
Yoon, Minho
Son, Minjae
Suh, Dongkyun
Eu, Hamin
Nam, Jeongsoo
author_facet Hwang, Euichul
Kim, Gyuyong
Choe, Gyeongcheol
Yoon, Minho
Son, Minjae
Suh, Dongkyun
Eu, Hamin
Nam, Jeongsoo
author_sort Hwang, Euichul
collection PubMed
description In this study, the effects of heating rate and compressive strength on the spalling behavior of single-sided heated ring-restrained concrete with compressive strengths of 60 and 100 MPa were investigated. The vapor pressure and restrained stress inside the concrete were evaluated under fast- and slow-heating conditions. Regardless of the heating rate, the concrete vapor pressure and restrained stress increased as the temperature increased, and it was confirmed that spalling occurred in the 100-MPa concrete. Specifically, it was found that moisture migration and restrained stress inside the concrete varied depending on the heating rate. Under fast heating, moisture clogging and restrained stress occurred across the concrete surface, causing continuous surface spalling for the 100-MPa concrete. Under slow heating, moisture clogging occurred, and restrained stress continuously increased in the deep area of the concrete cross-section owing to the small internal temperature difference, resulting in explosive spalling for the 100-MPa concrete with a dense internal structure. Additionally, while the tensile strength of concrete is reduced by heating, stress in the heated surface direction is generated by restrained stress. The combination of stress in the heated concrete surface and the internal vapor pressure generates spalling. The experimental results confirm that heating rate has a significant influence on moisture migration and restrained stress occurrence inside concrete, which are important factors that determine the type of spalling.
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spelling pubmed-85416642021-10-24 Explosive Spalling Behavior of Single-Sided Heated Concrete According to Compressive Strength and Heating Rate Hwang, Euichul Kim, Gyuyong Choe, Gyeongcheol Yoon, Minho Son, Minjae Suh, Dongkyun Eu, Hamin Nam, Jeongsoo Materials (Basel) Article In this study, the effects of heating rate and compressive strength on the spalling behavior of single-sided heated ring-restrained concrete with compressive strengths of 60 and 100 MPa were investigated. The vapor pressure and restrained stress inside the concrete were evaluated under fast- and slow-heating conditions. Regardless of the heating rate, the concrete vapor pressure and restrained stress increased as the temperature increased, and it was confirmed that spalling occurred in the 100-MPa concrete. Specifically, it was found that moisture migration and restrained stress inside the concrete varied depending on the heating rate. Under fast heating, moisture clogging and restrained stress occurred across the concrete surface, causing continuous surface spalling for the 100-MPa concrete. Under slow heating, moisture clogging occurred, and restrained stress continuously increased in the deep area of the concrete cross-section owing to the small internal temperature difference, resulting in explosive spalling for the 100-MPa concrete with a dense internal structure. Additionally, while the tensile strength of concrete is reduced by heating, stress in the heated surface direction is generated by restrained stress. The combination of stress in the heated concrete surface and the internal vapor pressure generates spalling. The experimental results confirm that heating rate has a significant influence on moisture migration and restrained stress occurrence inside concrete, which are important factors that determine the type of spalling. MDPI 2021-10-13 /pmc/articles/PMC8541664/ /pubmed/34683616 http://dx.doi.org/10.3390/ma14206023 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hwang, Euichul
Kim, Gyuyong
Choe, Gyeongcheol
Yoon, Minho
Son, Minjae
Suh, Dongkyun
Eu, Hamin
Nam, Jeongsoo
Explosive Spalling Behavior of Single-Sided Heated Concrete According to Compressive Strength and Heating Rate
title Explosive Spalling Behavior of Single-Sided Heated Concrete According to Compressive Strength and Heating Rate
title_full Explosive Spalling Behavior of Single-Sided Heated Concrete According to Compressive Strength and Heating Rate
title_fullStr Explosive Spalling Behavior of Single-Sided Heated Concrete According to Compressive Strength and Heating Rate
title_full_unstemmed Explosive Spalling Behavior of Single-Sided Heated Concrete According to Compressive Strength and Heating Rate
title_short Explosive Spalling Behavior of Single-Sided Heated Concrete According to Compressive Strength and Heating Rate
title_sort explosive spalling behavior of single-sided heated concrete according to compressive strength and heating rate
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8541664/
https://www.ncbi.nlm.nih.gov/pubmed/34683616
http://dx.doi.org/10.3390/ma14206023
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