Preparation and properties of SBS / crumb rubber composite modified asphalt ( SBS / CRCMA )

In view of the characteristics of drought, little rain and large temperature difference in Xinjiang, this paper takes SBS / CRCMA as the research object, and determines the optimal dosage of different components and their respective influence degree through orthogonal test. Taking SBS modified asphalt ( SBSMA ), crumb rubber modified asphalt ( CRNMA ) and SBS / CRCMA as the research objects, the storage stability of composite modified asphalt was analyzed by softening point difference method. The high and low temperature properties of SBS / CRCMA were evaluated by dynamic shear rheometer ( DSR ) and low temperature bending rheometer. The modification mechanism was analyzed by gel permeation chromatography ( GPC ) and Fourier transform infrared spectroscopy ( FTIR ). The test results show that : refining : towering = 6 : 4 ; sBS content 4% ; rubber powder content of 15% ; the optimum dosage of furfural oil is 4.5%, which has good storage stability and good high and low temperature performance. SBS, rubber powder and asphalt are mainly physically blended.