Effect of polystyrene particle content on mechanical properties and thermal insulation properties of concrete
Polystyrene particles(EPS)were used as the doping material,which were hydrophilic modified by different surfactants.On this basis,polystyrene particles were added to foam concrete,and the effects of hydro-philic modified polystyrene particles on the mechanical properties and thermal insulation performance of con-crete were studied.The results showed that unmodified polystyrene belongs to hydrophobic materials with a contact angle of 112°.After modification with triethanolamine,the contact angle decreased to 31°,indicating ex-cellent hydrophilicity.Foam concrete had porous characteristics,and the pore size distribution was 20-230 pm.The setting time decreased with the increase of polystyrene particle doping,the fluidity first increased and then decreased,the solidification time of EPS-0.9％was 90 minutes,and the highest fluidity was 17.9 mm.With the increase of EPS particles,the compressive strength of foam concrete continued decreasing,the flexural strength first decreased and then slightly increased,the thermal conductivity and dry density first decreased and then in-creased,and the carbonation resistance continued decreasing.At 28 d of age,the compressive strength of the EPS-1.2％sample reached the minimum value of 5.2 MPa,and the carbonization depth reached the maximum value of 2.13 mm.The flexural strength of the EPS-0.6％sample reached a maximum value of 0.57 MPa.The dry density and thermal conductivity of the EPS-0.9％sample reached the lowest values,which were 357 kg/m3 and 0.069 W/(m·K),respectively,indicating the best insulation performance.
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