Dynamic Compressive Behavior of 10-Year-Old Concrete Cores after Exposure to High Temperatures
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 5
Abstract
In fires, concrete structures sometimes suffer blasting loads. This paper investigated the effect of high temperature on the dynamic mechanical properties of concrete. The specimens were cored from 10-year-old concrete beams and exposed to room temperature (20°C), 200°C, 400°C, and 600°C. The split Hopkinson pressure bar (SHPB) was used to study the dynamic mechanical behavior. The results showed that the dynamic compressive stress–strain curve of concrete after exposure to high temperature can be divided into three stages: elastic growth, slow decline, and rapid decline. Furthermore, at the same temperature, as the strain rate increased, the dynamic strength increased. When the strain rate was constant, high temperature resulted in low dynamic strength. A dynamic constitutive model is proposed. The calculation results were in good agreement with the experimental data. Therefore, this model can provide a theoretical basis for the simulation of the dynamic mechanical behavior of concrete after exposure to high temperature.
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Acknowledgments
The research is based upon work supported by the National Natural Science Foundation of China (Grant Nos. 51779134 and 51579142) and the Young Elite Scientists Sponsorship Program by CAST (Grant No. 2017QNRC001).
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 5 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Mar 28, 2019
Accepted: Oct 16, 2019
Published online: Feb 22, 2020
Published in print: May 1, 2020
Discussion open until: Jul 22, 2020
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