| Due to comfort and superior performance of Asphalt Pavement, it has been widely used in the world. The development of transport industry makes the rapid growth of traffic volume, heavy-duty, overloading is intensified, traffic channel becomes more significant. It demands ever-increasing quality for the road material. The ordinary asphalt has been very hard to meet that request. In addition, as deck pavement, airport runways, SMA pavement, OGFC pavement and other adverse weather conditions of the road and some particularly important application on the road, it has higher requirements on the nature of asphalt binder, the ordinary asphalt has been very difficult to competent. Modified Asphalt to improve its performance has become the first choice for road worker. Practice shows that the good properties of modified asphalt for the climate characteristics and traffic loads not only can significantly increase the service life of asphalt pavement, but also can significantly improve by the working function of asphalt pavement, at the same time, can reduce the maintenance workload and cost of conservation, thereby to ensure asphalt pavement to provide safety, comfort, the prevailing economic conditions for road traffic.The first chapter of this article introduces the research purposes and research situation at home and abroad. In view of the expressway construction, asphalt pavement rutting and early damage, the SBS modified asphalt concrete need for the study. This paper introduces the SBS modified asphalt concrete Research. Bring forward the content that study on the properties of adding different doses of SBS modified bitumen into asphalt, determine a reasonable amount of modifier, and design the ratio of surface layer of asphalt mix to adapt to the northern region.The second chapter deals with the performance asphalt which adding different modifier. SBS content from 3% to 7%, after modifying the asphalt, with the increased dose of modifier, the lower the temperature sensitivity, high temperature and low temperature performance gradually improved; proposed to use 5°extension evaluation modified asphalt mixture to evaluate the low temperature properties is more reasonable. When adding the modifier SBS of 5%, modified bitumen has best integrated performance.The third chapter describes the pavement performance test of asphalt mixture. Through choosing the asphalt mixture aggregate grade, take AK - 13A type as a surface layers grade forLiaokai highway. And study on the working performance of asphalt and modified asphalt mixture. The conclusions are as follows: dynamic stability of modified bitumen mixture increased three times compared to asphalt mixture, low-bending strain of asphalt mixture increased 66%, residual stability improved 3.97KN. AK-13A asphalt mixture as a surface layer has high depth of the surface structure and friction coefficient.The fourth chapter discusses the construction and testing of asphalt mixture. Make advice for the construction process of SBS modified bitumen mixture: First, put forward a reasonable condition for mixing the SBS modified bitumen mixture. Aggregate temperature should be maintained at 180°C~190℃, modified asphalt temperature should be controlled at around 160°C, should not exceed 180°C; discharging temperature should be controlled at 175℃~185℃, no more than 195°C or below 170°C. Second, put forward a reasonable temperature for the mixture of asphalt paving and compaction. Paving temperature should be controlled at 145°C to 165°C, using double-drive vibration roller, arrange like type PIN to grind, strictly control the construction of progress, and to ensure that complete rolling operation above 90℃.Detect the 10km section after the completion. The results indicate that Asphalt Pavement Test results showed that the overall flatness outstanding, Only a flatness of 2.02mm/km is bigger than standard requirements. Whole sections of road 10km measured deflection value meet the design deflection value of no more than 25.50mm. Asphalt Pavement has high intensity. Asphalt Pavement damage detection results, sags and loose areas are almost zero, water damage phenomenon is less. Temperature cracks are inevitable, the result is three, and in a timely manner, has a slight rut, the greatest depth of rutting is only 6mm, far from meeting the requirements of no more than 2cm.Chapter V is the conclusions and further study scenario, sum up the research working in the process of this article. Also put forward the content and direction which will continue to conduct studies on in the work. |
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