Low-Temperature Performance of Acrylonitrile-Butadiene-Styrene and Crumb Rubber Compound-Modified Asphalt Activated by Waste Cooking Oil Surface Treatment

Compound modified asphalt with waste plastic and crumb rubber can enhance the application of crumb rubber-modified asphalt (CRMA) in engineering, and enable the recycling of waste resources. In this study, waste cooking oil (WCO) was used to activate crumb rubber and acrylonitrile-butadiene-styrene (ABS) to obtain crumb rubber-modified asphalt with excellent storage stability and low viscosity. The viscosity and storage stability of crumb rubber-modified asphalt were tested by rotational viscosity test and cigar tube test. The force ductility test and bending beam rheological (BBR) test were used to evaluate the low-temperature performance of different crumb rubber-modified asphalt samples. The effect of the addition of waste cooking oil and acrylonitrile-butadiene-styrene on the low-temperature performance of crumb rubber-modified asphalt was explored by using the Burgers model fitting parameters and the Delta Tc value between the limit temperature of the critical low-temperature performance grade. The test results showed that cooking oil reduces the rotational viscosity of crumb rubber-modified asphalt, and acrylonitrile-butadiene-styrene enhances its storage stability. When the acrylonitrile-butadiene-styrene and waste cooking oil contents reached 4% and 3%, respectively, the rotational viscosity and separation index values of crumb rubber-modified asphalt decreased by 11.2% and 49.8%, respectively. Waste cooking oil notably enhanced the crumb rubber-modified asphalt's ductility, particularly in the case of crumb rubber-modified asphalt compounded with 4% acrylonitrile-butadiene-styrene and 3% waste cooking oil, exhibiting the longest ductility and the highest toughness value, which were 85% and 75.6% higher than the original crumb rubber-modified asphalt, respectively. Insights from Burgers model parameters and Delta Tc values revealed that waste cooking oil improves CRMA's stress relaxation ability and reduces its critical low temperature, and acrylonitrile-butadiene-styrene has no adverse impact on CRMA's resistance to low-temperature thermal cracking. Fourier transform infrared spectroscopy (FTIR) test results demonstrated that the addition of acrylonitrile-butadiene-styrene does not lead to a chemical reaction with crumb rubber-modified asphalt.