Enhancement of mechanical and thermal properties of porous alkaline cements using silica and alumina nanoparticles

This study explores incorporation of silica- and alumina-bearing nanoparticles on the mechanical and physical properties of porous alkaline cements derived from industrial by-products. The aim was to determine if nanoparticles could enhance thermal performance, increasing porosity while maintaining compressive strengthSi nanoparticles enhanced strength, up to 100%, attributed to the combination of Si nanoparticles with the aluminosilicate gel. Al nanoparticles did not enhance mechanical performance, but led to density reduction, resulting in decreased strength. Thermal conductivity showed no significant variations due to nanoparticles, with all formulations classified as T2 thermal mortars. The best-performing formulation balanced density, thermal, and mechanical properties effectively, proving suitable for insulating core. Hygric properties within acceptable ranges, with water vapor permeability resistance <15 and capillary water absorption <0.4 kg/m2.min0.5. The findings highlight the potential of Si nanoparticles to improve mechanical performance of porous alkaline cements, offering valuable insights for application in thermal insulation.