In this study, cement mortar with paraffin/expanded perlite materials was prepared by direct mixing
method. The effect of paraffin/expanded perlite material content on mechanical and thermal properties
of cement mortar were investigated. The experimental results showed that the paraffin was confined in
the porous structures of expanded perlite by capillary force. The average mass percentages of paraffin in
paraffin/expanded perlite material reached as high as 65%. It was a physical interaction between paraffin
and expanded perlite. Compressive strength and flexural strength of cement mortar decreased with
increasing amount of paraffin/expanded perlite materials. Cement mortar with 20 wt% paraffin/expanded
perlite materials had good heat storage property and thermal stability compared to ordinary cement
mortar.