Waste polyethylene effect on asphalt binder and mixture properties: State of the art

A detailed review evaluating performance of asphalt binder and mixture after adding waste polyethylene (WPE) is presented in this paper. Searching for the most suitable ratio of WPE to be added and looking for which properties of asphalt binder and mixture are affected by WPE addition are addressed. There is an assent among many researchers that adding WPE to asphalt mixture has resulted in better properties shown by increasing softening point, viscosity and specific gravity, decreasing penetration, enhancing complex shear modulus values and decreasing phase angle values in addition to improving thermal stability, permanent deformation resistance, moisture resistance and creep modulus, while modified mixture bulk density and creep rate have decreased. The most suitable ratio of WPE is recommended between 4% and 12% by binder weight. Using WPE in its different forms has recently become very common in different regions worldwide because it helps in saving environment and country’s economy.