| Title |
Development of Nanomodified Snow-Melting Concrete Using Low-Temperature Phase-Change Material Impregnated Lightweight Aggregate |
| Authors |
경주현(Kyoung, Joo-Hyun) ; 김선미(Kim, Sean-Mi) ; 허종완(Hu, Jong-Wan) |
| DOI |
https://doi.org/10.12652/Ksce.2022.42.6.0787 |
| Keywords |
상변화물질; 융설포장도로; 제설염; 테트라데칸; 다중벽 탄소나노튜브 Phase change material; Snow melting pavement; Deicing salt; Tetradecane; Multi-walled carbon nanotubes |
| Abstract |
In winter, the excessive use of deicing salt deteriorates concrete pavement durability. To reduce the amount of deicing salt used, phase-changematerials (PCMs) potentially offer an alternative way to melt snow through their latent heat storage characteristics. In this research, thermalenergy storage concrete was developed by using PCM-impregnated expanded clay as 50 % replacement to normal aggregate by volume. Inaddition, to improve the thermal efficiency of PCM lightweight aggregate (PCM-LWA)-incorporated concrete, multi-walled carbon nanotubes(MWCNTs) were incorporated in proportions of 0.10 %, 0.15 %, and 0.20 % by binder weight. Compressive strength testing and programmedthermal cycling were performed to evaluate the mechanical and thermal responses of the PCM-LWA concrete. Results showed a significantstrength reduction of 54 % due to the PCM-LWA; however, the thermal performance of the PCM-LWA concrete was greatly improved withthe addition of MWCNTs. Thermal test results showed that 0.10 % MWCNT-incorporated concrete had high thermal fatigue resistance as wellas uniform heat flow, whereas specimens with 0.15 % and 0.20 % MWCNT content had a reduced thermal response due to supercooling whenthe ambient temperature was varied between -5 °C and 10 °C. |