Preparation and property analysis of phase change concrete PEG/SIO2-CPCM

Abstract

With polyethylene glycol (PEG) as the phase change material (PCM), and silica sol as inorganic porous carrier, this paper prepares the polyethylene glycol/silica sol composite phase change material (PEG/SiO2-CPCM) using sol-gel method, and adds PEG/SiO2-CPCM into concrete to prepare phase change concrete according to the absolute volume method. Next, this paper uses scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) to characterize the microstructure, compatibility, stability and energy storage of PEG/SiO2-CPCM, and tests the compressive strength and thermal conductivity of the phase-change concrete. The results show that PEG-2000 had a good compatibility with SiO2; the mass fraction of PEG in the CPCM should be controlled within 90 %; after 200 thermal cycles, the mass loss is less than 1 %. The PEG/SiO2-CPCM starts to undergo phase change at the temperature of 42.4 ℃; the strength of the phase-change concrete with a 5 % PEG content dropped by about 4.96 %; under the premise of ensuring good working performance, the addition of the PEG/SiO2-CPCM can greatly enhance the thermal conductivity of the concrete.