The Research Of Permanent Asphalt Pavement Fatigue Properties

Permanent asphalt pavement is just the regular replacement of the road surface (the surface can limit the disease), and not a structural repair or reconstruction, and the useful life of more than 40 years of asphalt pavement. It can be seen as a full-thick asphalt concrete pavement and asphalt pavement thick high-intensity development. As early as in the 1960s, began construction of full-thick asphalt concrete pavement and high-intensity thick asphalt pavement. Design and construction quality better part of the road has been successful in heavy traffic to provide long-term services.The traditional flexible pavement damage is mainly fatigue cracking and deformation of the two permanent structural damage, which means that the fatigue cracking under repeated load of asphalt surface bottom bending caused by fatigue cracking, and on the expansion until the asphalt surface throughout the ; Permanent deformation means that the load under the road structure to repeat the non-resumption of the deformation of the accumulation.Shell design and AI were to design asphalt mixture of asphalt pavement fatigue as a key design of the destruction of standards. Many scholars have done a great deal of research, the traditional method is the use of asphalt at the end of the strain to speculate layer of asphalt fatigue life, but because asphalt mixture fatigue failure mechanism is extremely complicated, the impact of fatigue life of many factors, and various factors Is the interaction between often, therefore, difficult to estimate the theoretical knowledge simple asphalt mixture of fatigue life, the general need for testing. The method is relatively common in the interior through the trabecular test asphalt mixture of fatigue life equation, combined with field test or road test to speed up the loading amendment by asphalt pavement fatigue life equation.First of all understand this chapter of fatigue and fatigue limit principle, on the basis of the introduction of asphalt mixture of fatigue limit test. In this paper, AASHTO T321 strain under the control of the 4-points test method, using asphalt KLMY90 # ,the two asphalt content: The best asphalt content and rich amount of asphalt and SBS, by contrast, that their anti-fatigue properties of difference . By controlling the strain of two-thirds point of asphalt mixture fatigue test, using different analytical methods, the mixture of different parameters and fatigue The relationship between the number of role and, through cyclic loading tests of overloading the asphalt mixture of fatigue limit the impact.