TY - JOUR
T1 - Thermal and structural characterization of geopolymer-coated polyurethane foam-phase change material capsules/geopolymer concrete composites
AU - Hassan, Ahmed
AU - Rashid, Yasir
AU - Mourad, Abdel Hamid I.
AU - Ismail, Najif
AU - Laghari, Mohammad Shakeel
N1 - Funding Information:
Funding: This research was funded by the Program for Advanced Research (31N204-UPAR-5-2014).
Funding Information:
Acknowledgments: The authors would like to express their appreciation to United Arab Emirates University (UAEU) for funding the research through the Program for Advanced Research (31N204-UPAR-5-2014) and the Faculty of Engineering at the UAE University for facilitating the experimentation.
Funding Information:
The authors would like to express their appreciation to United Arab Emirates University (UAEU) for funding the research through the Program for Advanced Research (31N204-UPAR-5-2014) and the Faculty of Engineering at the UAE University for facilitating the experimentation. This research was funded by the Program for Advanced Research (31N204-UPAR-5-2014)
Publisher Copyright:
© 2018 by the authors.
PY - 2019
Y1 - 2019
N2 - The thermal and structural performance of geopolymer-coated polyurethane foam-phase change material capsules/geopolymer concrete composites was investigated. Three groups of concrete composites were prepared. The first was pure geopolymer (GP, control sample), the second was a GP/polyurethane foam (F) concrete composite, and the third was GP-coated polyurethane foam-phase change material capsules (GP-F-PCM)/GP concrete composites. Three different percentages of foam and GP-F-PCM capsules (25%, 50%, and 75%) were used in the composites. Thermal and U-value tests were conducted for all composites to characterize their peak temperature damping and insulation performances. The addition of 75% foam has been noticed to increase the back-surface temperature by 5.9 °C compared to the control sample. This may be attributed to the degradation of foam into low molecular constituents in the presence of a strong alkali. However, a temperature drop of 12.5 °C was achieved by incorporating 75% of GP-F-PCMcapsules. The addition of 50%foamas a sandwich layer between two halves of a geopolymer concrete cube is also investigated. It was found that inserting a foam layer reduced the back-surface temperature by 3.3 °C, which is still less than the reduction in the case of GP-F-PCM capsules. The compressive strength was tested to check the integrity of the prepared concrete. At 28 days of aging, the compressive strength dropped from 65.2 MPa to 9.9 MPa with the addition of 75% GP-F-PCM capsules, which is still acceptable for certain building elements (e.g., nonloadbearing exterior walls). Generally, the best results were for the GP-F-PCM composite capsules as a heat insulator.
AB - The thermal and structural performance of geopolymer-coated polyurethane foam-phase change material capsules/geopolymer concrete composites was investigated. Three groups of concrete composites were prepared. The first was pure geopolymer (GP, control sample), the second was a GP/polyurethane foam (F) concrete composite, and the third was GP-coated polyurethane foam-phase change material capsules (GP-F-PCM)/GP concrete composites. Three different percentages of foam and GP-F-PCM capsules (25%, 50%, and 75%) were used in the composites. Thermal and U-value tests were conducted for all composites to characterize their peak temperature damping and insulation performances. The addition of 75% foam has been noticed to increase the back-surface temperature by 5.9 °C compared to the control sample. This may be attributed to the degradation of foam into low molecular constituents in the presence of a strong alkali. However, a temperature drop of 12.5 °C was achieved by incorporating 75% of GP-F-PCMcapsules. The addition of 50%foamas a sandwich layer between two halves of a geopolymer concrete cube is also investigated. It was found that inserting a foam layer reduced the back-surface temperature by 3.3 °C, which is still less than the reduction in the case of GP-F-PCM capsules. The compressive strength was tested to check the integrity of the prepared concrete. At 28 days of aging, the compressive strength dropped from 65.2 MPa to 9.9 MPa with the addition of 75% GP-F-PCM capsules, which is still acceptable for certain building elements (e.g., nonloadbearing exterior walls). Generally, the best results were for the GP-F-PCM composite capsules as a heat insulator.
KW - Compressive strength
KW - Geopolymer concrete
KW - Phase change material
KW - Polyurethane foam
KW - Thermal insulation
KW - Thermal performance
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U2 - 10.3390/MA12050796
DO - 10.3390/MA12050796
M3 - Article
AN - SCOPUS:85065869540
SN - 1996-1944
VL - 12
JO - Materials
JF - Materials
IS - 5
M1 - 796
ER -