AIMS Energy, 2018, 6(3): 521-529. doi: 10.3934/energy.2018.3.521

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Mechanical properties of concrete containing beeswax/dammar gum as phase change material for thermal energy storage

1 Department of Mechanical Engineering, Faculty of Engineering, University of Syiah Kuala, Banda Aceh 23111, Indonesia
2 Department of Mechanical Engineering, Faculty of Engineering, University of Syiah Kuala, Banda Aceh 23111, Indonesia
3 Department of Chemical Engineering, Faculty of Engineering, University of Syiah Kuala, Banda Aceh 23111, Indonesia
4 Department of Mechanical Engineering, Universiti Tenaga Nasional, Kajang 43000, Selangor, Malaysia
5 Faculty of Engineering and Information Technology, University of Technology Sydney, NSW 2007, Australia

This study aims to investigate the mechanical properties of concrete containing phase change materials (PCM). This research begins with the investigation of melting temperature, enthalpy, the thermal conductivity of the phase change materials using the T-history method, followed by preparation of concrete containing PCM, and finally testing of mechanical properties of concrete through compressive strength test. This study used beeswax, tallow, and dammar gum as PCM mixture. From the results of the PCM properties test, shows that the latent heat energy content from beeswax and tallow exhibit an excellent potential to be used as PCM, while dammar gum is benefited in increasing the thermal conductivity of concrete containing PCM. From concrete specimen test containing 10%, 20% and 30% PCM with 7 days and 28 days aged, the results exhibit that the mechanical properties of the concrete decreased along with the increasing of PCM content. The same test also conducted at the PCM melting temperature. Therefore, the concrete compressive strength test conducted at 45 oC. From the test results, the concrete compressive strength decreased about 3–24% of PCM-0% concrete compressive strength. Drastic compressive strength reduction tends to occur in PCM-Tallow concrete mixture. This study concluded that the PCM is potentially useful as a heat energy absorber material in buildings and lightweight concrete rather than construction structures.
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