Application Study On Superpave In Jiyan Expressway Engineering

Along with the vigorous development of our country in highway transportation, the highway construction changes with each new day, since specially the reform and open policy, our country's first-class highway construction likely mushroom growth has obtained the development which progresses by leaps and bounds. Because the bituminous pavement had such merits as the high intensity, the smooth performance and good durability, it is widely used, and occupies the first-class highway road surface above 80%. But as the volume of traffic obviously increases, vehicles increasing enlargement, caused the path before to achieving the service life to present the massive wheel ruts, package and the crack, enormous influence driving security and transportation comfortableness. So we should set a higher request to bituminous pavement structure, the material as well as various aspects performance. This has brought the new task to us,"how to select the high quality material, to design the more reasonable pavement structure, to propose the more scientific reliable mixture design method".Superpave is one brand-new, the content widespread bituminous mixture design and the analysis system, is also the American road strategic research plan (SHRP) an achievement. The SHRP asphalt research's final achievement is the Superpave bituminous mixture design and the analysis system, is one kind of improvement based on the performance system, this system had stipulated the bituminous cement and the mineral aggregate's nature, and has carried on the bituminous mixture design and the analysis pavement performance.Our country has not integrated the Superpave bituminous mixture design method the standard, the Superpav bituminous mixture design and the analysis system according to American own climate, the environment as well as the load situation studies, whether as for to apply completely our country waits for the general scientific researcher's discussion and the analysis. In this case, the Superpave bituminous mixture design and the analysis system are the existence are certainly difficult in our country's popularization application, how unifies this system and our country present condition is we should the primordial consideration question, seeks for the revolving compaction method and the horse rests the compaction method relations also appears especially important, thus designs the higher quality bituminous mixture. This article analytical study Superpave bituminous mixture's design and the analysis system, to the Superpave design idea, the rationale, bituminous cement's PG hierarchy system and cleared off the performance the appraisal mechanism, the aggregate choice and the appraisal mechanism, the bituminous mixture volume design, the blend synthesis grading curve control point and the restricted sector and so on have made the exhaustive introduction; And take HuangDun experiment highway as an example, introduced under detail the asphalt the surface layer Sup-25 bituminous mixture design process: The bituminous cement design, aggregate selection, the synthesis gradation's determination, the best asphalt amount determination as well as with Marshall the method the construction quality control which and the examination designs to the Superpave volume.This article has conducted system's research and the analysis to the Superpave bituminous mixture design system, unified lucky extends highway HuangDun to experiment the road project to carry on the massive experiments, its main conclusion was as follows:1. The Superpave bituminous mixture design system has certain guiding sense regarding our country's bituminous mixture ratio design, the Superpave revolving compaction meter's formed method is more scientific than reasonably the Marshall compaction method. Although has not integrated our country standard and the universal use, but its formed method and the design concept are worth us using for reference.2. The bituminous binder selected gives up having the empirical tradition asphalt technical specification, like penetration, softening point, and ductility and so on. But uses reflection roads and so on asphalt fluidity, permanent deformation, weary dehiscence and temperature dehiscence with the performance changing mechanics target, and uses the revolving compaction machine simulation scene the compaction process, causes mechanics target and the road uses the performance the relevance to be good. And the application must suit our country's climate and the transportation situation.3. By the test result, the Sup-25 asphalt under-surface layer satisfies the high performance bituminous pavement each technical specification request, and meets and satisfies the present standard Marshall technical specification requirements completely.4. The Superpave bituminous mixture's construction craft and the conventional blend have certain difference. To mixes up the building the control request to be stricter, the roller compaction is more difficult. May through raw material quality control, mix up the building production, the scene construction and the construction examination and so on various links' control, achieves the quite ideal effect.5. Through the construction of HuangDun experiment road, gained the application experience of the Superpave bituminous mixture's in our province highway construction.