Abstract
Thermal conductivity is an important material property in the energy design process of the buildings. While cement-based materials are the most consumed materials in the construction industry, thermal properties of these materials can play a significant role in energy efficiency of the buildings. Cementitious materials with low thermal conductivity can be desirable for using as a part of heat insulation or for thermal bridge calculations. They may be used in different forms such as cast concrete, on-site 3D printing or surface finishes. In this study, aerogel granules was used as aggregate and combination of phosphate based cement and fly ash was considered as binder in order to achieve a fast setting material with low thermal conductivity. Furthermore, the calcination process was eliminated for the phosphate cement, which led to a material with lower environmental impact. Thermal conductivity as low as 0.04 W/mK was measured using the proposed material composition.
Highlights
A building material which can be used in construction of the buildings with properties such as energy efficiency, sound insulation, fire resistance, light weight, versatility and quick production and installation has always been the dreaming material for architects and builders
The thermal conductivity can still be reduced by introducing more water and aerogel granules to the mixture. Insulating property of these materials can significantly be affected in presence of moisture and using hydrophobic agents can help overcoming this drawback
Since this material has an open porosity structure and the thermal conductivity is low at air dried condition, there might be no need for internal hydrophobation of the material in some specific applications
Summary
A building material which can be used in construction of the buildings with properties such as energy efficiency, sound insulation, fire resistance, light weight, versatility and quick production and installation has always been the dreaming material for architects and builders. Having a hydrophobed pore system, with extremely small pores in the range of 20 to 60 nanometers, aerogel particles have excellent insulation properties. Aerogel is the lightest solid material known at present, these particles are very strong towards uniform pressure and are even elastic. They can be squeezed together and will spring back after the pressure is released. Using these particles as granules in cementitious composites, applies sheer forces to them during the steering process. The smaller particles created after steering, will still have the same hydrophobic nano-pores with excellent insulating properties
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