Study on the Preparation and Properties of Diatomaceous Earth Based Phase Change Concrete
The standardized phase change materials were prepared by using n-decanoic acid and n-octadecane as phase change materials,and diatomaceous earth as the matrix material.Phase change diatomaceous earth was pre-pared by vacuum adsorption method and encapsulated with epoxy resin and styrene acrylic lotion.The coarse aggre-gate was replaced with phase change diatomaceous earth to prepare diatomaceous earth based phase change con-crete,and study its mechanical and thermal properties.The research results show that when the water bath tempera-ture is 80 ℃ and the adsorption time is 120 min,the adsorption rate of diatomaceous earth for n-decanoic acid and n-octadecane is the highest,and the encapsulating effect of phase change diatomaceous earth with epoxy resin is the best,the mass loss rate of 1.85％is the maximum.The compressive strength of phase change concrete decreases with the increase of phase change diatomaceous earth content.The C30 concrete strength requirement is met when the phase change diatomaceous earth content is 10％.When the silicon powder replacement rate is 5％,the compressive strength of phase change concrete is the highest.The heat storage and release performance of phase change concrete is good.The heat conductivity decreases with the increase of phase change diatomaceous earth content.The maximum heat conductivity of phase change concrete is achieved with a silicon powder replacement rate of 10％.Both the effect of phase change cycle on the compressive strength and heat conductivity of concrete are relatively smaller,therefore phase change concrete has good phase change cycle stability.This research result can provide a reference for the de-sign and construction of phase change concrete structures.
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