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Appl. Sci. 2017, 7(8), 811; doi:10.3390/app7080811

Experimental Evaluation of Thermal Performance and Durability of Thermally-Enhanced Concretes

1
Department of Architecture, Sejong University, Seoul 05006, Korea
2
New Transportation Research Center, Korea Railroad Research Institute, Uiwang-Si, Gyeonggi-do 16105, Korea
3
Infra Structure Team, Technical Division, GS E & C, Grand Seoul, 33 Jong-ro, Jongno-gu, Seoul 03159, Korea
4
Department of Civil Engineering, Kangwon National University, Chuncheon-si, Gangwon-do 24341, Korea
*
Author to whom correspondence should be addressed.
Received: 10 July 2017 / Revised: 1 August 2017 / Accepted: 2 August 2017 / Published: 8 August 2017
(This article belongs to the Section Energy)
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Abstract

The thermal performance and durability of the thermally-enhanced concrete with various insulating materials were evaluated through a series of tests. Three types of insulating materials—diatomite powder, hollow micro-spheres, and a micro-foam agent—were used for both normalweight aggregate concrete (NWAC) and lightweight aggregate concrete (LWAC). The thermal conductivity was measured by two different test methods: quick thermal conductivity meter (QTM) and guarded hot wire (GHW) methods. Then, the results were compared with each other. All insulating materials used in this study proved their ability to reduce the thermal conductivity. Additionally, it can be found that the trend of a decrease in air-dry density is similar to that of thermal conductivity of thermally-enhanced concrete. Additional thermal transmission tests with seven large-scale specimens were conducted by using the calibrated hot box (CHB). However, from this tests, it was seen that thermal transmission reduction for tested specimens were not large compared to the thermal conductivity reduction measured by QTM and GHW, due to multiple heat transfer. To examine the durability of thermally-enhanced concretes, accelerated carbonation and freeze-thaw cycle tests were conducted. From the results, it can be found that the thermally-enhanced concrete shows good freeze-thaw resistance. However, the carbonation rates of the concretes increased rapidly and additional methods to improve the carbonation resistance should be considered. View Full-Text
Keywords: thermal insulation materials; thermal conductivity; thermal transmission; freeze-thaw test; carbonation rate test; lightweight aggregate concrete thermal insulation materials; thermal conductivity; thermal transmission; freeze-thaw test; carbonation rate test; lightweight aggregate concrete
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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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MDPI and ACS Style

Jeong, Y.-W.; Koh, T.-H.; Youm, K.-S.; Moon, J. Experimental Evaluation of Thermal Performance and Durability of Thermally-Enhanced Concretes. Appl. Sci. 2017, 7, 811.

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