Study on the Influence Factors of Dynamic Modulus and Phase Angle of Dense Gradation Polyurethane Mixture

Polyurethane (PU) mixture is a new pavement material with excellent performance, and most research was focused on the enhancement of but rarely dynamic property. This paper studied factors including gradation, aggregate type, PU content, which may influence property mixture. Test results showed that kind linear viscoelastic material, its modulus phase angle changed test temperature loading frequency, would drop by 40%~50% raised from 5 °C to 55 °C. All could affect proved analysis covariance. The effect gradation did not change increase nominal maximum size (NMAS), limestone higher than basalt, curing speed ultimate stiffness mixture, content help in So, more consideration about selection should be taken into design produce best structure combination save investment.