| The asphalt concrete road was widely applied to the high grade road surface because of its one's own merit such as comfortable driving and easy to repair. However, along with the development of national economy, there were lots of dilapidations forms on the asphalt roads for the volume of traffic increases rapidly, the channeling running, and overloading seriously, etc. But the design methods'limitations of asphalt mixture of the Superpave and the Marshall were unveiled little by little. Superior Performing Asphalt Pavement (Superpave) is the end products in area of asphalt and mix after the Strategic Highway Research Program(SHRP) have been finished. Road researchers are worldwidely interested to it. This advantantage technology is being introduced into China now. Not all that Americans did in SHRP are suitable to China. One of the reasons is that the SHRP's equipment are expensive, another is that there are many differences USA'climate, hydrographic conditions, geolgic conditions, ESAL's, materials and China's. We should assimilate SHRP's method and improve it according to China's facts. Aimed at optimizing the limitations of the existing design methods of the asphalt concrete in the highway in china, This text is around pilesing up the properties and optimize the pitch and mix this thread of design method of match ratio of material according to collecting the material, different pitch in three mixes the design method of match ratio of the material through adopting, and mix at five kinds ore materials than when go on by physics, mechanics performance tests a series of. And through at traditional Marshall design method and Superpave pitch that method compound mix material carry on way compares with and analyses with performance, The result shows, adopt and mix thick, detailed piling up and inlay lock cooperate with pitch who proportion compound mix material have high temperature stability and impervious swimming skill can a good one relatively by ore material that characteristic choose according to one, its surface is coarse, and it is better to resist slippery performance. At last discussing the relationship between the Superpave and Marshall system from gyratory compaction etc. As to designing and constructing the bituminous surface course of Ji-Tai Expressway, this paper based on the SHRP design idea, supported by the bituminous surface of Ji-Tai Expressway. Ji-Tai Expressway,which is bidirectional six lanes and as long as about fifty-four kilometers, is the superposition of Jin-Fu Expressway and Jin-Hu Expressway in Shan Dong province. With the bituminous surface mixture, choosing three grading aggregate curves for collection structure, the No.1 compound grading aggregate is the median curve of AC-16I, the No.2 compound grading aggregate is to choose S grading aggregate curve which meets the grading aggregate range of AC-16I best, and the No.3 compound grading aggregate is the SUPERPANE coarse grading aggregate curve. With the mixture of different Using the way of Superpave and Marshall to compare and design to summarize the principle of variation of cubage for mixed materials. It is not considered that the surface characteristic of materials in Marshall design. While the question mentioned above is solved by Superpave design. According to liquid mechanics measurement of function of bituminous surface, bituminous mixed materials are used. And ratating tamp machine is used to simulate tamping process on the spot to improve measurement of mechanics and surface function. The function of bituminous mixed materials is closely relevent to interspace rate. |
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