Effect of dithiodimorpholine and tetraethylthiuram disulphide on ageing properties of SBS-modified asphalts

Effect of additives dithiodimorpholine (denoted as D) and tetraethylthiuram disulphide (denoted as T) on high-temperature storage stabilities and thermal oxidative ageing performance of SBS-modified asphalt were studied. Considering cost and performance, the content and ratio of D:T should be 0.2% and 1:3, respectively, and the result was confirmed by dynamic shear rheological testing of the samples before and after ageing. Mixtures of SBS-modified asphalt with D and T were prepared by physical high-speed shearing. The thin film oven test was used for simulating thermal degradation during short-term ageing. The results show that appropriate content and ratio of additives D and T can improve anti-ageing properties of SBS-modified asphalts; moreover, the advance of high-temperature storage stabilities of the mixture was significant.