| Summary: | Mortar thermal storage layers incorporating phase change material (PCM) can improve the thermal performance of radiant floors in buildings, reduce indoor temperature fluctuations and thus provide further savings in building heating energy consumption, offering great potential for the application of active thermal energy storage systems. This study combines slag cement and microencapsulated phase change materials as cementitious composites for heat storage mortars with the aim of determining the addition ratio of phase change materials in slag cement mortars, thereby expanding the practical application of PCM mortars in radiant floors. For this purpose, slag cement mortar blocks containing microencapsulated phase change materials were prepared to further evaluate their thermal and mechanical properties. This involves incorporating PCM particles from 0% to 15% and adjusting the water content during the initial mixing stages. The characterization results reveal that the inclusion of PCM particles in slag cement mortar significantly affects its thermal and mechanical properties. Notably, each 1% increment in PCM particles reduces bulk density, compressive strength, and thermal conductivity of the mortar by 2%, 24%, and 9%, respectively. SSC3 specimens (with a PCM ratio of 1.97 wt%) showed promising thermal and mechanical properties and could be a thermally enhanced building material for the design of thermal storage layers in radiant floor heating systems.
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