Thermal Properties of Hybrid Fiber-Reinforced Reactive Powder Concrete at High Temperature
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 3
Abstract
In order to study the thermal properties of reactive powder concrete (RPC) at high temperatures, the thermal conductivity, thermal diffusivity, specific heat capacity, and linear expansion coefficient of hybrid fiber-reinforced RPC at 20°C–900°C are measured. The formulas of thermal parameters with the volume fraction of polypropylene fiber and the elevated temperatures are fitted and compared with the ordinary concrete (OC) and high-strength concrete (HSC). The results indicate that as the temperature increases, the thermal conductivity and thermal diffusivity first descend and then rise, while the linear expansion coefficient and specific heat capacity first increase and then decrease. The thermal conductivity and specific heat capacity of RPC are lower than that of OC and HSC, and the thermal diffusivity coefficient of RPC is lower than that of HSC and higher than that of OC. Through inputting the measured thermal parameters to the finite-element software, the simulated temperature–time curves of hybrid fiber-reinforced RPC are obtained and compared with the measured curves. It is found that the two curves are basically consistent, and thus the measured thermal parameters are accurate and reliable, and can be used in the numerical simulation analysis of RPC structures under fire.
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Acknowledgments
The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (Grant No. 51508346), the Top-notch Young Talent Program of Hebei Province (Grant No. BJ2016050), and the Natural Science Foundation of Hebei Province (Grant No. E2015210020).
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 3 • March 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jun 21, 2018
Accepted: Jul 30, 2019
Published online: Jan 16, 2020
Published in print: Mar 1, 2020
Discussion open until: Jun 16, 2020
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