The Research On SBS Modified Asphalt Performance And Evaluating Indicator

According modified asphalt to the problems of evaluating the road performance of the SBS with the Chinese Road Modified Asphalt Technical Standards using currently, lots of conventional experiments, SHRP rheological experiments and thermal analysis are acted with different conditions. In this paper, three base asphalt types representing three oil sources and three modifiers (two line types and one star type) are processed. This paper discusses the relation between dosage of SBS and the characteristics of SBS modified asphalt, on this basis, 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.Conclusions of the paper: Through the analyses of modified asphalt with different variety and different SBS dosage in conventional experiments such as penetration, ductility, softening point, elastic recovery and so on, the relation between the dosage of SBS and various technical performances of SBS modified asphalt is obtained, the basis of evaluating the quality of SBS modified asphalt in conventional technical performance is provided. Through the analyses of modified asphalt with different SBS dosage in SHRP rheological experiments such as dynamic shear experiment, beam bending experiment and so on, the relation between the dosage of SBS and SHRP technical performance of SBS modified asphalt is obtained, the basis of evaluating the quality of SBS modified asphalt in SHRP rheological performance is provided. Through the analyses of modified asphalt with different SBS dosage in the Thermogravimetry experiment and Differential Scanning Calorimetry experiment, the relation between the dosage of SBS and Combustion Releasing Heat of SBS modified asphalt is obtained, the basis of evaluating the quality of SBS modified asphalt in thermal performance analysis is provided.On the basis of analyzing the experimental characteristics of SBS modified asphalt in the paper to provide the certain theories for effective modifications and reasonable applications to asphalt engineering.