Nowadays, the construction is one of the main European sectors responsible for the
high levels of energy consumption and raw material extraction. Increasingly, the energy
consumption from renewable sources and industrial waste reuse are the only ways to
minimize these environmental and societal problems. Simultaneous incorporation of
phase change materials and fly ash in the mortars increases the energy efficiency and
decreases the waste materials landfilled. The development of mortars with phase change
materials and fly ash incorporation contributes to a significant improvement of the building
comfort parameters and the environmental quality. The phase change materials possess
the capability to normalize the temperature flux inside the buildings, using the solar
energy as resource. The main purposes of this study were the physical, mechanical, and
thermal characterization of mortars with phase change materials and fly ash incorporation.
It was concluded that the phase change materials and fly ash simultaneous incorporation
leads to homogeneous and suitable mortars with increased thermal behavior
compared with the phase change material addition alone.