Investigation of Carbonyl of Asphalt Binders Containing Antiaging Agents and Waste Cooking Oil Using FTIR Spectroscopy

Abstract

Abstract The improved antiaging property of asphalt binders containing two types of antioxidants (tns-(2.4-di-tert-butyl)-phosphite (168) and antioxidant 1010 (1010)) and waste cooking oil (WCO) were investigated using Fourier transform infrared spectroscopy. In addition, the regeneration of WCO in aged asphalt binders was discussed. To assess the effects of antioxidants and WCO on the antiaging property of asphalt binders during the thermal oxidative aging process and the regeneration of WCO in aged asphalt binders, the carbonyl indexes were calculated. Experimental results indicated that 168, 1010, and WCO could reduce the carbonyl index of asphalt binders, and moreover, asphalt binders containing 168 had a smaller carbonyl index than those containing 1010, and the carbonyl indexes of the aged asphalt binders were reduced with the increase in WCO content. Therefore, the antioxidants and WCO could improve the antiaging property of asphalt binders, and WCO could be used as a rejuvenator for aged asphalt binders.