Preparation and performance study of polystyrene particle composite insulation mortar
Using polystyrene particles as the reinforcing phase of mortar,surface treatment of polystyrene parti-cles was first carried out through triethanolamine,and then polystyrene particle composite insulation mortar was prepared.The effect of triethanolamine dosage on the water contact angle of polystyrene particles was stud-ied,and its influence on the mechanical properties,microstructure,drying shrinkage performance and thermal conductivity of composite insulation mortar was explored.The results showed that the modification treatment with triethanolamine reduced the water contact angle of polystyrene particles,and the polystyrene particles changed from hydrophobic to hydrophilic.The increase in the amount of triethanolamine reduced the viscosity of the composite insulation mortar and increased the dry density.The lowest viscosity of the EPS-5％sample was 8.8 cm,and the highest dry density was 237 kg/m3.With the increased of triethanolamine dosage,the water absorption of composite insulation mortar first decreased and then gradually stabilized.The compressive strength,flexural strength,shear bonding strength,and softening coefficient all increased first and then de-creased,while the drying shrinkage rate and thermal conductivity first decreased and then increased.The water absorption rate of the EPS-5％sample was the lowest at 0.62％,and the softening coefficient was the highest at 0.63.The compressive strength,flexural strength,and shear bond strength of the sample reached their maxi-mum values at 28 d of age,which were 2.05,0.64,and 0.26 MPa,respectively.At 7 d,the drying shrinkage rate of EPS-5％sample was the lowest at 0.0385％,and the thermal conductivity was the lowest at 0.045 W/(m·K),indicating the optimal insulation performance.
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