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Materials 2017, 10(5), 462; doi:10.3390/ma10050462

Thermal Properties of Cement-Based Composites for Geothermal Energy Applications

1
College of Civil Engineering, Shenzhen University, Shenzhen 518060, China
2
Department of Civil Engineering, School of Engineering, Nazarbayev University, Astana 010000, Kazakhstan
*
Author to whom correspondence should be addressed.
Academic Editor: Christof Schneider
Received: 1 February 2017 / Revised: 22 April 2017 / Accepted: 25 April 2017 / Published: 27 April 2017
(This article belongs to the Section Energy Materials)
View Full-Text   |   Download PDF [5426 KB, uploaded 27 April 2017]   |  

Abstract

Geothermal energy piles are a quite recent renewable energy technique where geothermal energy in the foundation of a building is used to transport and store geothermal energy. In this paper, a structural–functional integrated cement-based composite, which can be used for energy piles, was developed using expanded graphite and graphite nanoplatelet-based composite phase change materials (CPCMs). Its mechanical properties, thermal-regulatory performance, and heat of hydration were evaluated. Test results showed that the compressive strength of GNP-Paraffin cement-based composites at 28 days was more than 25 MPa. The flexural strength and density of thermal energy storage cement paste composite decreased with increases in the percentage of CPCM in the cement paste. The infrared thermal image analysis results showed superior thermal control capability of cement based materials with CPCMs. Hence, the carbon-based CPCMs are promising thermal energy storage materials and can be used to improve the durability of energy piles. View Full-Text
Keywords: composite phase change materials; geothermal energy storage; cement-based composites; structural–functional integrated materials; mechanical properties; thermal properties composite phase change materials; geothermal energy storage; cement-based composites; structural–functional integrated materials; mechanical properties; thermal properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bao, X.; Memon, S.A.; Yang, H.; Dong, Z.; Cui, H. Thermal Properties of Cement-Based Composites for Geothermal Energy Applications. Materials 2017, 10, 462.

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