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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 1    September 2009

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Mechanical properties of high-strength concrete subjected to high temperature by stressed test
Gyu-Yong KIM, Young-Sun KIM, Tae-Gyu LEE

Division of Architecture Engineering, Chungnam National University, Daejeon, Korea

Abstract:Recently, the effects of high temperature on compressive strength and elastic modulus of high strength concrete were experimentally investigated. The present study is aimed to study the effect of elevated temperatures ranging from 20 ℃ to 700 ℃ on the material mechanical properties of high-strength concrete of 40, 60 and 80 MPa grade. During the strength test, the specimens are subjected to a 25% of ultimate compressive strength at room temperature and sustained during heating, and when the target temperature is reached, the specimens are loaded to failure. The tests were conducted at various temperatures (20−700 ℃) for concretes made with W/B ratios of 46%, 32% and 25%, respectively. The results show that the relative values of compressive strength and elastic modulus decrease with increasing compressive strength grade of specimen.

 

Key words: high-strength concrete; stressed test; high temperature

ISSN 1672-7029
CN 43-1423/U

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