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Creep Behavior of High-Strength Concrete Subjected to Elevated Temperatures

Strain is generated in concrete subjected to elevated temperatures owing to the influence of factors such as thermal expansion and design load. Such strains resulting from elevated temperatures and load can significantly influence the stability of a structure during and after a fire. In addition, th...

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Autores principales: Yoon, Minho, Kim, Gyuyong, Kim, Youngsun, Lee, Taegyu, Choe, Gyeongcheol, Hwang, Euichul, Nam, Jeongsoo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5551824/
https://www.ncbi.nlm.nih.gov/pubmed/28773144
http://dx.doi.org/10.3390/ma10070781
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author Yoon, Minho
Kim, Gyuyong
Kim, Youngsun
Lee, Taegyu
Choe, Gyeongcheol
Hwang, Euichul
Nam, Jeongsoo
author_facet Yoon, Minho
Kim, Gyuyong
Kim, Youngsun
Lee, Taegyu
Choe, Gyeongcheol
Hwang, Euichul
Nam, Jeongsoo
author_sort Yoon, Minho
collection PubMed
description Strain is generated in concrete subjected to elevated temperatures owing to the influence of factors such as thermal expansion and design load. Such strains resulting from elevated temperatures and load can significantly influence the stability of a structure during and after a fire. In addition, the lower the water-to-binder (W–B) ratio and the smaller the quantity of aggregates in high-strength concrete, the more likely it is for unstable strain to occur. Hence, in this study, the compressive strength, elastic modulus, and creep behavior were evaluated at target temperatures of 100, 200, 300, 500, and 800 °C for high-strength concretes with W–B ratios of 30%, 26%, and 23%. The loading conditions were set as non-loading and 0.33f(cu). It was found that as the compressive strength of the concrete increased, the mechanical characteristics deteriorated and transient creep increased. Furthermore, when the point at which creep strain occurred at elevated temperatures after the occurrence of transient creep was considered, greater shrinkage strain occurred as the compressive strength of the concrete increased. At a heating temperature of 800 °C, the 80 and 100 MPa test specimens showed creep failure within a shrinkage strain range similar to the strain at the maximum load.
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spelling pubmed-55518242017-08-11 Creep Behavior of High-Strength Concrete Subjected to Elevated Temperatures Yoon, Minho Kim, Gyuyong Kim, Youngsun Lee, Taegyu Choe, Gyeongcheol Hwang, Euichul Nam, Jeongsoo Materials (Basel) Article Strain is generated in concrete subjected to elevated temperatures owing to the influence of factors such as thermal expansion and design load. Such strains resulting from elevated temperatures and load can significantly influence the stability of a structure during and after a fire. In addition, the lower the water-to-binder (W–B) ratio and the smaller the quantity of aggregates in high-strength concrete, the more likely it is for unstable strain to occur. Hence, in this study, the compressive strength, elastic modulus, and creep behavior were evaluated at target temperatures of 100, 200, 300, 500, and 800 °C for high-strength concretes with W–B ratios of 30%, 26%, and 23%. The loading conditions were set as non-loading and 0.33f(cu). It was found that as the compressive strength of the concrete increased, the mechanical characteristics deteriorated and transient creep increased. Furthermore, when the point at which creep strain occurred at elevated temperatures after the occurrence of transient creep was considered, greater shrinkage strain occurred as the compressive strength of the concrete increased. At a heating temperature of 800 °C, the 80 and 100 MPa test specimens showed creep failure within a shrinkage strain range similar to the strain at the maximum load. MDPI 2017-07-11 /pmc/articles/PMC5551824/ /pubmed/28773144 http://dx.doi.org/10.3390/ma10070781 Text en © 2017 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yoon, Minho
Kim, Gyuyong
Kim, Youngsun
Lee, Taegyu
Choe, Gyeongcheol
Hwang, Euichul
Nam, Jeongsoo
Creep Behavior of High-Strength Concrete Subjected to Elevated Temperatures
title Creep Behavior of High-Strength Concrete Subjected to Elevated Temperatures
title_full Creep Behavior of High-Strength Concrete Subjected to Elevated Temperatures
title_fullStr Creep Behavior of High-Strength Concrete Subjected to Elevated Temperatures
title_full_unstemmed Creep Behavior of High-Strength Concrete Subjected to Elevated Temperatures
title_short Creep Behavior of High-Strength Concrete Subjected to Elevated Temperatures
title_sort creep behavior of high-strength concrete subjected to elevated temperatures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5551824/
https://www.ncbi.nlm.nih.gov/pubmed/28773144
http://dx.doi.org/10.3390/ma10070781
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