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Appl. Sci. 2016, 6(10), 271; doi:10.3390/app6100271

Testing of High Thermal Cycling Stability of Low Strength Concrete as a Thermal Energy Storage Material

1
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
2
Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Academic Editor: Stefano Invernizzi
Received: 25 August 2016 / Revised: 14 September 2016 / Accepted: 15 September 2016 / Published: 22 September 2016
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Abstract

Concrete has the potential to become a solution for thermal energy storage (TES) integrated in concentrating solar power (CSP) systems due to its good thermal and mechanical properties and low cost of material. In this study, a low strength concrete (C20) is tested at high temperatures up to 600 °C. Specimens are thermally cycled at temperatures in the range of 400–300 °C, 500–300 °C, and 600–300 °C, which TES can reach in operation. For comparison, specimens also cycled at temperature in the range of 400–25 °C (room temperature), 500–25 °C, and 600–25 °C. It is found from the test results that cracks are not observed on the surfaces of concrete specimens until the temperature is elevated up to 500 °C. There is mechanical deterioration of concrete after exposure to high temperature, especially to high thermal cycles. The residual compressive strength of concrete after 10 thermal cycles between 600 °C and 300 °C is about 58.3%, but the specimens remain stable without spalling, indicating possible use of low strength concrete as a TES material. View Full-Text
Keywords: low strength concrete; thermal energy storage; thermal cycling; solar energy low strength concrete; thermal energy storage; thermal cycling; solar energy
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Wu, C.; Pan, J.; Zhong, W.; Jin, F. Testing of High Thermal Cycling Stability of Low Strength Concrete as a Thermal Energy Storage Material. Appl. Sci. 2016, 6, 271.

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