Study On Granulated Crumb Rubber Asphalt Mixture Technology In Frost Region

Transportation security is a difficult problem for administrator in cold region. Granulated crumb rubber asphalt mixture is a new mixture with granulated crumb rubber. Granulated crumb rubber act as aggregates in mixture, which are crashed from scrap tires. Ice and snow layers are in different conditions on granulated crumb rubber asphalt pavement for elasticity of granulated crumb rubber. Thus it can be eliminated from pavement. It is a effective method to anti-ice-snow. Moreover, the quantities of scrap tires are increasing. It is necessary to deal with so many scrap tires. Granulated crumb rubber asphalt mixture is the best choice. However it lacks systemic research on application technologies of granulated crumb rubber asphalt mixture, such as gradation design or compaction technology and anti-ice-snow performance.Thus the application technologies of granulated crumb rubber asphalt mixture are studied in the paper. It includes characteristics of granulated crumb rubber, gradation composition design, compaction technology and anti-ice-snow performance. The main contents are introduced in the following paragraphs. The effect of granulated crumb rubber characteristics on mixtures performance are analyzed in three aspects. They are shape characteristics, surface characteristics and physical and mechanical characteristics. The technical index are confirmed through performance test.The results indicate the shape characteristics and the physical and mechanical characteristics are important to performance of mixture . But the surface characteristics is minor. When rigidity of granulated crumb rubber is increased, the performance of mixture is improved including compaction performance, volume performance and enduring performance.The ratio of coarse aggregates, granulated crumb rubber and coarse granulated crumb rubber are confirmed using the central composite design and response surface methodology. Then mixture gradations are designed with volume design method. According the characteristics of granulated crumb rubber asphalt mixture, the improved Marshall test method is put forward to confirm the optimal asphalt content. In this process the anti-scaling ratio is considered...