摘要
Abstract
As an efficient asphalt modification material,rock asphalt(BRA)has abundant resources and good modification effect,but the lack of low temperature performance has become the primary factor limiting its application.In order to solve this problem,styrene butadiene rubber(SBR)was used as a composite modifier.Firstly,the composite modification mechanism of SBR and rock asphalt was investigated by Fourier transform infrared spectroscopy(FTIR).Then,based on the Brinell viscosity test,dynamic shear rheological test and bending beam rheometer test,the influence of different SBR content on the rheological properties and high and low temperature properties of asphalt was revealed.The results show that SBR and BRA modification of asphalt is a physical process.The temperature sensitivity of SBR modified BRA is the largest when the content is 6％,which has a good guiding value for the selection of asphalt mixture operating temperature and the evaluation of service performance.The addition of SBR significantly improved the low temperature performance of BRA modified asphalt,and the recommended SBR content was 4％.关键词
岩沥青/丁苯橡胶/流变性能/高温性能/低温性能Key words
rock asphalt/styrene butadiene rubber/rheological properties/high temperature performance/low temperature performance分类
交通工程
