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Influence of SBS Dosage on the Performance of Modified Asphalt

In this paper, two base asphalt types representing two oil sources and two modifiers (linear and star-shaped) are processed. This paper discusses the relation between dosage of SBS and the characteristics of SBS modified asphalt. Modified effects related to the structure and molecular weight of SBS. The modification effect of star-shaped modifier is better but the processing performance of linear modifier is better. The index of evaluating the production quality of SBS modified asphalt is proposed and the basis of controlling the construction quality of SBS modified asphalt is provided. Through the analyses of modified asphalt with different variety and different SBS dosage in conventional experiments such as penetration, ductility, softening point and the relation between the dosage of SBS and various technical performances of SBS modified asphalt is obtained. After the modified, penetration is decreased and softening point and ductility is increased, which prolonged the service life of pavement.