| Title |
Performance Enhancement of PCM Composite Mortar for Building and Pavement Applications Using Acid-Treated MWCNTs and GGBS |
| Authors |
김선교(Kim, Sun-Kyo);손현배(Son, Hyun-Bae);지성원(Ji, Sung-Won);허종완(Hu, Jong-Wan) |
| DOI |
https://doi.org/10.12652/Ksce.2025.45.6.0615 |
| Keywords |
상변화 물질; 졸-겔 코팅; 산 처리 탄소나노튜브; 고로괴제슬래그; 열 사이클링 Phase change material; Sol-gel coating; Acid-treated carbon nanotubes; Blast furnace slag; Thermal cycling equation; River morphological parameters; Sinuosity |
| Abstract |
In this study, we evaluated the thermal and mechanical performance of PCM composite aggregate (SG), which is a composite aggregate made by impregnating activated carbon with tetradecane (PCM) and then applying a silica-based sol-gel coating, incorporated into mortar. To compensate for the strength loss caused by the application of SG, blast furnace slag powder (GGBS, 10 %) and multi-walled carbon nanotubes (MWCNTs) dispersed via ultrasonic and acid treatment were introduced together. DSC analysis revealed that SG had a reduced latent heat compared to pure PCM, but enhanced thermal stability by alleviating supercooling and suppressing leakage. Raman analysis revealed that acid-treated MWCNTs exhibited the best dispersibility due to the introduction of functional groups. Compressive strength evaluations showed that strength recovery was achieved in the GGBS-incorporated group, and the mix containing acid-treated MWCNTs exceeded OPC in 28-day strength. In thermal cycling tests, the acid-treated MWCNTs also showed improved temperature responsiveness due to increased thermal conductivity. These results confirmed that the combined use of GGBS
and acid-treated MWCNTs is an effective strategy to alleviate the strength degradation problem of SG-based PCM composite aggregates and simultaneously improve thermal stability. |