This paper initially reports on development of lightweight aggregates impregnated with phase change material (LWA-PCM), for application in mortars, plasters and other building materials. This is followed by a study into the development and characterisation of prototype cement mortars using the LWA-PCMs. The work has developed methodologies for efficiently impregnating and hosting phase change materials (PCMs) into lightweight aggregates (LWAs), including aerated concrete particles (ACG) and perlite. PCMs can store and release energy within a given temperature range, moderating thermal fluctuations, resulting in the reduction of energy lost in buildings and increasing thermal comfort. Three commercial PCMs, with melting points between 18 °C and 25 °C, were used in this study. Methods, including vacuum impregnation and immersion, and conditions for optimal absorption of the PCMs into ACG, were developed and evaluated experimentally. Different coating materials, to limit leakage of PCMs from the aggregates, were also trialled as part of this study. Compared to immersion, vacuum impregnation resulted in an increased absorption by up to 15.6 % depending on the type and viscosity of the PCMs.
Original languageEnglish
Article number129390
JournalConstruction and Building Materials
Early online date2 Nov 2022
Publication statusE-pub ahead of print - 2 Nov 2022


  • Phase Change Material
  • Lightweight aggregates
  • Energy efficiency
  • Cement mortar


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