The research for crumb rubber/waste plastic compound modified asphalt

Crumb rubber (CR)/waste plastic compound modified asphalts were prepared by the addition of CR and waste plastic including waste polypropylene, low-density polyethylene, linear low-density polyethylene (LLDPE). The physical properties of each modified asphalt were studied and compared, and LLDPE was confirmed as the right modifier in enhancing the high-temperature performance. Meanwhile, dioctyl phthalate (DP) as a plasticizer was used further in improving low-temperature properties. On the basis of the optimal proportion of CR/LLDPE/DP modified asphalt, rheological tests were used to study the high- and low-temperature properties and structural characteristics of modified binder. Fourier transform infrared spectroscopy was used to investigate the modification mechanism of each modifier. Morphology observation was used to study the effect of modifier and ageing on the morphological characteristics of asphalt. Thermal analysis was adopted to study the thermodynamic characteristics and constituents of each modified binder.