Research On The Properties Of High-viscosity Asphalt And Its Mixture Based On The Compound Of Karamay Asphalt And Tahe Asphalt

Karamay asphalt and Tahe asphalt are the main types of road asphalt produced in Xinjiang.Karamay asphalt has been widely used in highway construction in Xinjiang,its component characteristics are low asphaltene content and excellent low temperature performance.Asphalt pavement paved with Karamay asphalt also has a good use effect;The asphaltene content of the Tahe asphalt is significantly higher than that of the commonly used road petroleum asphalt.Although it has good high temperature performance,it has poor low temperature ductility.Tahe asphalt is rarely used in road construction in Xinjiang and the price is also low.With the rapid development of transportation in Xinjiang,the requirements of asphalt construction in Xinjiang’s highway construction are increasing day by day.Especially in engineering construction projects with high performance requirements such as tunnel pavement and bridge deck pavement,Unmodified asphalt has been difficult to meet the use requirements,so the demand for modified asphalt is increasing.In recent years,due to its outstanding performance advantages,high-viscosity asphalt has become a hot spot in the research of modified asphalt materials,and its application in highway engineering construction is increasing.In Xinjiang,if localization and application of high viscosity asphalt can be realized,the quality of pavement use can be effectively improved.Due to the special content of Karamay asphalt components,the compatibility with commonly used polymer modifiers is poor,making it difficult to modify high-viscosity asphalt.Considering that the Tahe asphalt has a high asphaltene content,it has complementary advantages with Karamay asphalt,it is technically feasible to prepare high-viscosity modified asphalt with the matrix asphalt compounded by the two and will reduce material costs.In this paper,carrying out research on the properties of high-viscosity asphalt and its mixture compounded with Karamay asphalt and Tahe asphalt.First,Karamay asphalt and Tahe asphalt were compounded in six ratios.Through the analysis of the performance and component content of the compounded asphalt,the three compounding ratios were initially selected;Furthermore,the high-viscosity asphalt modifiers developed in the earlier stage were used to modify the three types of compound asphalt under multiple dosages,and multiple sets of high-viscosity modified asphalt samples were prepared.Based on the penetration classification system and SHRP classification system,the performance of the prepared high-viscosity modified asphalt was compared and evaluated,and two high-viscosity modified asphalt formulations with obvious performance advantages were selected;Finally,the preparation and road performance evaluation of SMA-13 mixture were carried out with the two high-viscosity modified asphalts of the two preferred formulations,and further verify the performance advantages of Tahe asphalt and Karamay asphalt to produce high-viscosity asphalt.The research in this paper shows that it is feasible to prepare high-viscosity asphalt by the compounding process of Karamay asphalt and Tahe asphalt.Among them,the high-viscosity asphalt and its mixture prepared with the scheme of mixing ratio of Tahe asphalt and Karamay asphalt of 7:3 and modifier content of 9% have both performance and cost advantages;The scheme of compounding ratio of Tahe asphalt and Karamay asphalt of 3:7 and modifier content of 13%,although the cost advantage is not obvious,the low-temperature performance of high viscosity asphalt and its mixture prepared by this scheme is particularly outstanding and can also be considered as one of the preferred schemes.