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Materials 2017, 10(7), 781; https://doi.org/10.3390/ma10070781

Creep Behavior of High-Strength Concrete Subjected to Elevated Temperatures

1
Department of Architectural Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea
2
Research & Development Institute, Lotte Engineering & Construction, 3 Naruteo-ro 10-gil, Seocho-gu, Seoul 06527, Korea
3
Research & Development Institute, Daelim Industrial Co., Ltd., F16 D1, 17 Jongno 3-Gil, Jongno-Gu, Seoul 03155, Korea
*
Author to whom correspondence should be addressed.
Received: 22 May 2017 / Revised: 19 June 2017 / Accepted: 6 July 2017 / Published: 11 July 2017
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Abstract

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 0.33fcu. 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. View Full-Text
Keywords: high strength concrete; thermal expansion; total strain; transient creep; high temperature; creep strain high strength concrete; thermal expansion; total strain; transient creep; high temperature; creep strain
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Yoon, M.; Kim, G.; Kim, Y.; Lee, T.; Choe, G.; Hwang, E.; Nam, J. Creep Behavior of High-Strength Concrete Subjected to Elevated Temperatures. Materials 2017, 10, 781.

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