Influence Factors and Prediction Model of Viscosity for Crumb Rubber Modified Asphalt

Abstract

To reuse waste rubber tires is a global issue. One method of reusing tires is to process them into crumb-sized particles and produce crumb rubber modified asphalt (CRMA), which is a an effective way of reducing the pollution and resource utilization. Rotary viscosities of CRMA prepared under different conditions were measured to analyze the effects of treating methods, treating temperature, crumb rubber size, treating time and rubber dosage on the viscosity of CRMA. And a prediction model of viscosity of CRMA was developed. Test results indicate that, using the high-speed stirring method, viscosity of CRMA (η) appears quadratic function relationship with processing temperature (T) and crumb rubber mesh (D), exponential relation with the dosage of crumb rubber (R), but has no significant rule with the stirring time. By regression analysis, prediction model of viscosity of CRMA has a high viscosity fitting accuracy, which can provide a reference for production process of CRMA.