毕业设计论文—SMA20混合料的配合设计和高温性能研究.doc

摘要 山区高速公路所处地形复杂，经常要面临长大爬坡路段的情况。在爬坡车道上，货车车速较慢，对沥青路面施加更长时间的荷载，从而可能会导致沥青混凝土面层过大的流变变形；同时，爬坡车道沥青路面会面临垂直力和较大的水平力的综合作用，从而在路面内部产生复杂的剪切应力，导致沥青面层内部出现剪切破坏，而产生过大的变形。 爬坡车道的过大变形对于行车的安全性和路面使用的耐久性极为不利，因此，对于山区高速公路爬坡车道的沥青路面设计必须要进行专门研究。国内目前高速公路常用的沥青路面结构组合方式以及三层式的沥青材料类型已经不能适应这种严酷条件下的路面使用要求和道路运营安全性的要求。 通过对山区高速公路沥青路面爬坡车道的结构组合与材料的研究，可以针对爬坡车道上的受力状态和材料在特定受力状态下的变形特点，加强材料的设计，利用必威体育精装版的沥青混凝土设计技术，提高沥青混凝土材料本身的抗剪切变形能力；同时对于结构组合进行优化和革新，采用更加合理的结构组合类型，从而可以最大程度地满足爬坡路段荷载的作用要求。 对于爬坡车道的下面层，应该采用骨架密实型的沥青混合料类型，形成具有最佳抗车辙能力的结构。SMA结构是沥青混合料骨架结构中符合此种要求的最佳混合料类型。因此本课题对此进行材料的级配和最佳沥青用量的设计并进行性能验证，得出符合工程要求的SMA20混合料的配合设计和高温性能研究。 关键字：高温性能；爬坡性能；车辙试验 Abstract The mountains of the terrain is complex and often have grown up the hill road. Drive on the hill, the slower speed and tarred longer applied load, which may cause asphaltic concrete layer of hunan deformation ；at the same time, up the driveway tarred will be perpendicular to a higher level of comprehensive role in the internal produce a complicated cut to stress, pitch surface of an internal sabotage, a large deformations. Up the driveway of a great shape for the safety and road use the durability of great disservice to the mountains, therefore, the highway up the asphalt drive the road surface design must be devoted to research. The country bituminous roads at present, the general assembly and the three-tier structure, method of type of bituminous material has been unable to adapt to such conditions, road use and operation of the security requirements. On the highway up the driveway tarred with the structure of the combination of research, may be directed against the hill on the drive on the status and material in particular the state of shape, the strengthening of the material characteristic of design, the use of the latest technology and improve the design asphaltic concrete asphaltic concrete material resisting deform ； ability of the shear； The structural optimization for combinations and innovation, the more reasonable structure, which can be combined ty