Evaluation of Cooling Effect and Rheological Properties of USP Modified Asphalt
As a new type of viscosity reducing agent,USP modifier is mainly used in the study of the performance evaluation of asphalt mixture,Performance optimization and there are few studies on the rheologi-cal behavior of asphalt.Dynamic shear rheometer(DSR)and bending beam rheometer(BBR)are used to analyze the comprehensive properties of USP modified asphalt.Results showed that with the increase of USP dosage,the effect of viscosity reducing,high temperature,fatigue and low temperature properties of modified asphalt shows the regular changes.USP plays an important role in reducing viscosity and cooling temperature effect of asphalt,and the asphalt mixture also proves the effective cooling effect and meets the warm mixing level.High temperature performance(softening point,complex modulus,phase angle,rut factor,irrecovera-ble creep Jnr and strain recovery rate R)is damaged,Jnr3.2 can effectively evaluate its high temperature resist-ance to permanent deformation compared with high temperature performance grade(PG).The fatigue life is enhanced significantly.The continuous grading temperature Tc shows that the low-temperature critical tem-perature of USP warm-mixed modified asphalt is continuously decreasing,and the ability to resist the low-temperature cracking behavior is significantly enhanced.As a result,USP modifier has the potential as a good warm mixer,expanding the addition of materials for low temperature and cold areas.
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