Title:
Phase Change Material for Enhancement the Frost Resistance of Cementitious Materials (Prepublished)
Author(s):
Zhiyong Liu, Jinyang Jiang, Yang Li, Yuncheng Wang, Xi Jin, and Zeyu Lu
Publication:
Materials Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
cement-based materials; N-tetradecane; expanded graphite; capsule phase change material; frost resistance
DOI:
10.14359/51746807
Date:
5/8/2025
Abstract:
A capsule phase change material (CPCM) was synthesized using n-tetradecane as the core, expanded graphite as the shell, and ethyl cellulose as the coating material through a controlled assembly process. The results demonstrate that the infiltration of n-tetradecane significantly enhances the density of the expanded graphite, while the ethyl cellulose coating effectively prevents the desorption and leakage of the liquid phase change material during phase transitions. As a result, the CPCM exhibits a compact structure, chemical stability, and excellent thermal stability. The incorporation of this CPCM into cement-based materials endows the material with an autonomous heat-release capability at temperatures below 5°C. When the CPCM content reaches 20%, the thermal conductivity of the cementitious matrix increases by 24.66%. Moreover, the CPCM significantly improves the freeze-thaw resistance of the cement-based materials, reducing the compressive strength loss by 96% and the flexural strength loss by 65% after freeze-thaw cycles. This CPCM fundamentally enhances the frost resistance of cement-based materials, addressing the issue of freeze-thaw damage in concrete structures in cold regions.