Preparation, microstructure, performance and mortar application of paraffin/titanium-bearing blast furnace slag phase change aggregate

Jun Jiang, Luo Lei (Lead / Corresponding author), Chao Jin, Tie Liu, Jinqiao Huang, Yanping Wu, Shuzhen Lv, Zhongyuan Lu, Li Zheng, Jun Li

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
101 Downloads (Pure)

Abstract

The application of phase change materials (PCM) in building energy saving is limited by the cost and performance of PCM carriers. Using solid waste as a PCM carrier can reduce cost and environmental impacts. In this study, lightweight and porous titanium-bearing blast furnace slag (Ti-BFS) was innovatively used as PCM carrier to prepare paraffin/Ti-BFS phase change aggregate (PTA) by vacuum impregnation, and then PTA was used to develop thermal energy storage cement mortar by replacing sand. The microstructure and performance of aggregate and mortar were also investigated. The results indicated that PTA has a paraffin loading rate of 21.9%, latent heat of 65.7 J/g for melting and 65.0 J/g for freezing, and good chemical compatibility. The microstructure reveals that PTA has good compatibility with cement matrix. Compared with ordinary cement mortar, a reduction percentage of 28-day compressive strength, dry density and thermal conductivity at 100% PTA substitution rate are respectively 39.8%, 29.1% and 52.5%. However, a significant capacity to weaken temperature fluctuation was observed.

Original languageEnglish
Article numbere02262
Number of pages15
JournalCase Studies in Construction Materials
Volume19
Early online date28 Jun 2023
DOIs
Publication statusPublished - Dec 2023

Keywords

  • Expanded titanium-bearing blast furnace slag
  • Leakage
  • Phase change material
  • Stability
  • Thermal energy storage cement mortar

ASJC Scopus subject areas

  • Materials Science (miscellaneous)

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