Research on low temperature fracture toughness of rubber powder/polyester fiber asphalt mixes
Using rubber powder(RP),polyester fiber(PET)and rubber vinylidene(TOR)as asphalt modifiers,the effects of the modifier mass fraction on the low-temperature(-30℃)fracture toughness of specimens were studied based on a response surface model.Through ANOVA,it was found that RP and TOR were significant main effects,RP×PET and PET×TOR were significant interaction effects,RP2,PET2 and TOR2 were significant secondary effects,which was consistent with the results of the Pareto plot.As the mass fraction of the three modifiers increased,the low-temperature fracture toughness of the specimens first increased and then decreased.When the mass fraction of rubber powder was 4％,the average fracture toughness reached the highest with the value of 40.36MPa·mm0.5;When the mass fraction of TOR was 0.8％,the low-temperature fracture toughness reached 40.16MPa·mm0.5.When the mass fraction of rubber powder and polyester fiber were 4％and 0.5％,respectively,the fracture toughness of the specimens were the highest,and there was a synergistic effect between these two factors.When the mass fractions of RP,PET and TOR were 3.77％,0.52％and 0.84％,respectively,the low-temperature fracture toughness of the specimens were 43.54MPa·mm05,and the experimental value was 42.67 MPa·mm0.5,which was very consistent.
rubber powderpolyester fiberasphalt mixesresponse surface modellow temperature fracture toughness
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