Residual Mechanical Properties of High-Strength Concretes after Exposure to Elevated Temperatures
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 1
Abstract
This paper presents the results of a study on the effect of high temperatures on the mechanical properties of high-strength concretes. Mixtures were prepared with water to cementitious material ratios of 0.40, 0.35, and 0.30 containing silica fume at 0, 6, and 10% cement replacement. After heating to 100, 200, 300, and , the compressive strength, the splitting tensile strength, and the corresponding ultrasonic pulse velocity were measured. A substantial loss of strength was observed for all compositions at , particularly the silica fume concretes in spite of the superior mechanical properties provided by silica fume at room temperature. The average residual compressive and splitting tensile strengths of the concretes at were 30 and 25% of the room-temperature strengths, respectively. It was found that the rate of the splitting tensile strength loss is higher than the rate of the compressive strength loss at elevated temperatures and that the ultrasonic pulse velocity measurements slightly underestimates the residual strength of the high-strength concretes after exposure to temperature over .
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Acknowledgments
The writers thank Dr. H. Ziari, director of concrete and construction materials laboratory at Iran University of Science and Technology, Souri and the staff of fireproof materials laboratory, and Safar Yousefi, technician at IUST, for his assistance in preparing and testing the specimens for the research reported in this paper. The second writer wishes to extend his sincere thanks to Professor S. Mindess, Dr. F. Behnood, Dr. A. Ansar, and Dr. F. Rajabipour for their valuable guidance and advice.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 1 • January 2010
Pages: 59 - 64
Copyright
© 2010 ASCE.
History
Received: Jul 23, 2007
Accepted: Aug 17, 2009
Published online: Dec 15, 2009
Published in print: Jan 2010
Notes
Note. Associate Editor: Nemkumar Banthia
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