Preparation and Performance of SiO2 Aerogel-Modified Composite Fire-Resistant Polystyrene Foam Board
A binary gradation model of polystyrene foam particles and glass beads was constructed,and the optimal particle size gradation of polystyrene foam particles and glass beads was about 5∶2 and the volume ratio was about 100∶7.Based on the gradation model,the aggregate was prepared and the composite fire-resistant polystyrene foam boards were fabricated using molding process.The microstructure diagrams revealed that the aggregate stacked up in a dense and well-organized arrangement.An analysis was conducted to investigate the influence of silicate cementitious material,SiO2 aerogel,and hydrophobic agent on the performance of the composite fire-resistant polystyrene foam board.The results indicate that an increase in the content of silicate cementitious material enhances the fire resistance and tensile strength of the composite fire-resistant polystyrene foam board.Conversely,an increase in SiO2 aerogel content results in a reduction of thermal conductivity and tensile strength,accompanied by an increase in the softening coefficient.Additionally,the water absorption rate decreases with an increase in the content of the hydrophobic agent.
fire-resistant composite polystyrene foam boardpolystyrene foam particleSiO2 aerogeltotal calorific value of combustiongradation model
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