Utilization of phase change materials and rubber particles to improve thermal and mechanical properties of mortar

Phase change materials (PCMs) and rubber particles from recycled tires were used in portland cement mortar with a potential application as insulation mortar. Series of tests were designed and conducted including compressive strength, flexural strength, thermal conductivity, drying shrinkage, and bond strength tests at 7 days and 28 days of age. Different types of additives were also used in the mix designs. The experimental results showed that mechanical properties of rubberized-mortar can be improved by adjusting the size of rubber particles and the amount of additives. With the same volume fraction of PCM and rubbers, the mechanical properties of PCM-modified mortar are either the same or better than that of rubberized-mortar. In terms of thermal properties, the rubber particles can reduce thermal conductivity of the mortar significantly, while the PCM can improve heat capacity of the mortar.

► Phase change materials (PCMs) and rubber particles were used to make insulation mortar. ► Thermal and mechanical properties of the insulation mortar were tested at different ages. ► Mechanical properties of mortar can be improved by fine rubber particles and the additives. ► The mechanical properties of PCM-mortar are the same or better than that of rubberized-mortar. ► The rubber can reduce thermal conductivity, and the PCM can improve heat capacity of the mortar.