Evaluation of Asphalt Mixtures Containing Sasobit(R) Warm Mix Asphalt Additive

摘要

This paper presents the laboratory performance of conventional hot mix asphalt mixture and mixture containing warm mix additive named Sasobit(R). The laboratory evaluation included Hamburg-type loaded wheel tracking test (LWT), Dynamic modulus (E*) test, and Semi-Circular Bend (SCB) Test. Test results showed that the fracture resistance of conventional mixture, as determined from the critical value of Jintegral of the SCB test, was slightly lower than that of the Sasobit(R) modified mixture. Sasobit(R) modified mixture exhibited lower modulus values, E*, than the conventional mixture. This difference between the conventional and the Sasobit(R) modified moduli decreased as the temperature increased, indicating that the modulus was minimally affected at higher temperature due to the Sasobit(R) modification. In this limited evaluation, the moisture susceptibility of both mixtures was similar. The rut depth, as measured from the LWT test, of Sasobit(R) modified mixture was slightly lower that the rut depth of the conventional mixture.