Development and experimental study on the physical-mechanical properties of lightweight phase change concrete
Using silica aerogels as the matrix material and low-temperature phase change paraffin wax as the phase change material,shaped composite phase change materials were prepared.Characterization and stability tests of the shaped composite phase change materials were conducted using Fourier-transform infrared spectros-copy,differential scanning calorimetry,synchronous thermal analysis,and diffusion-permeation circle tests.The results indicate that the shaped composite phase change material prepared with a wax adsorption mass of 75％is the most stable,with the interaction between silica aerogels and paraffin wax being purely physical ad-sorption.The phase transition temperature of the shaped composite phase change material is 26.52 ℃,and the latent heat of phase transition is 56.2 J/g.By incorporating it into EPS concrete,the cement paste flowability experiment restricts the optimum proportion of shaped composite phase change material to around 16％,yield-ing optimal working performance of the concrete mixture.Physical-mechanical property tests reveal that with the addition of the shaped composite phase change material,the compressive,flexural,and splitting tensile strengths of the specimens all exhibit a certain degree of improvement.Through thermal storage performance tests in a thermal chamber,specimens with added shaped composite phase change material show a decrease in the slope and peak value of the heating and cooling curves.This indicates that lightweight phase change concrete has excellent temperature control performance and can be used in energy-efficient building envelope systems.
phase change concretebuilding energy efficiencycharacterization analysisphysical and mechanical propertiestemperature control performance
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