Influence of base asphalt aging levels on the foaming characteristics and rheological properties of foamed asphalt

Abstract Foamed asphalt technique is widely used in road construction due to its environmental and economic effects. The various characteristics of foamed asphalt and mixtures have already been investigated; however, few studies focused on what happened on the properties of foamed asphalt when the base asphalt was aged at different degree. In this study, the foaming characteristics and rheological performance of foamed asphalt prepared by different aging levels for base asphalt and foaming water content were determined. The rheological properties such as failure temperature, Zero shear viscosity @60 °C, temperature sensitivity, and fatigue resistance were evaluated by DSR tests. The results show that the deeper aging degree of asphalt for foaming process needs higher temperature and more foaming water content. And aging process of asphalt has better for high-temperature performance and temperature sensitivity, and adverse for fatigue resistance performance.