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Thermal Energy Storage Enhancement of Lightweight Cement Mortars with the Application of PCMs

In this study, cement-based thermal energy storage composites (TESC) were developed by integrating a novel phase change material (PCM) composite into ordinary cement mortar (NC). The composite PCM is based on paraffin and hydrophobic expanded perlite and it is form-stable when integrating into cementitious composites. The composite PCM was integrated as partial replacement for fine aggregate by absolute volume replacement method and the replacement ratios are 20%, 40%, 60% and 80%. The mechanical and thermal performance of TESC was studied. The results reveal that the TESC developed by integrating composite PCM into ordinary cementitious composites show superior thermal performance with acceptable mechanical properties. TESC prepared by replacing 80% of composite PCM (TESC-80) shows the apparent density of 1100 kg/m3 and 28 days compressive strength of 18 MPa. Furthermore, the thermal conductivity of TESC was reduced by 62%, which shows the TESC has good insulation capacity than ordinary cement mortar. Most importantly, incorporation of phase change material in the form of composite PCM shows significant enhancement in thermal performance. In comparison to NC, TESC-80 shows an increase of 56% and 166% for thermal energy storage rate and thermal energy storage capacity respectively.
 
This paper highlights application of the C-Therm TCi Thermal Conductivity Analyzer.
 

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