Abstract: To resolve the sealing problem of solid-liquid phase change materials when transforming into liquid, a novel paraffin-based capsule was prepared with paraffin as the core material, ceramsite particles as the carrier and cement paste as the coating material.The basic properties of the paraffin-based capsule were tested, and the test of DSC was conducted.In addition, the thermal conductance and mechanical properties of mortar incorporated with paraffin-based capsule were tested.Results reveal that cement paste helpes the paraffin-based capsule maintain a good hold ability of the loaded paraffin, without leakage under high temperature.The incorporation of paraffin-based capsule into mortar does not negatively affect the mechanical property of mortar, moreover, it reduces the thermal conductivity and hydration temperature of cement paste and delayes the appearance of the highest hydration temperature.

Key words: paraffin-based capsule;mortar;thermal conductivity;hydration temperature