Title:
Study on Preparation and Thermophysical Properties of Binary Paraffin Phase Change Concrete
Author(s):
Zhiwen Jia, Dongwei Li, Zecheng Wang, Zhenhua Wang and Fang Fang
Publication:
IJCSM
Volume:
19
Issue:
Appears on pages(s):
Keywords:
Binary phase change paraffin, Phase change concrete, Semi-adiabatic temperature rise, Thermal properties
DOI:
10.1186/s40069-024-00730-8
Date:
3/31/2025
Abstract:
The binary phase change paraffin (BP) was prepared using the melt blending method, followed by adsorption
and encapsulation to produce the phase change aggregate. Phase change concrete was subsequently prepared
using the volumetric replacement method. The study examined the thermal properties of BP, along with the semiadiabatic
temperature rise and thermal conductivity of the phase change concrete at different replacement rates.
The results indicate that BP exhibits two plateau regions, with phase change intervals varying according to the mass
ratio. The high-temperature phase change interval ranges from 18.3 °C to 47.3 °C, while the low-temperature phase
change interval ranges from 0.1 °C to 4.6 °C. When the mass ratio of 48# paraffin to 5# paraffin is 7:3, the peak phase
change temperatures are 2.58 °C and 44.52 °C, with corresponding enthalpies of 66.52 J/g and 102.63 J/g, respectively.
The addition of phase change aggregate effectively reduces the hydration temperature rise of concrete, slows
the rate of temperature increase, and decreases the thermal conductivity. The semi-adiabatic temperature rise curve
of the phase change concrete exhibits an "S"-shaped variation over time, with the composite exponential function
providing a more accurate representation of this process.