Research On Graded Gravel Basic Material Composition And Performance In High-altitude Region Of YunNan

The semi-rigid asphalt pavement has higher capacity, the overall stability and anti-fatigue properties, which are widely used domestic heavy duty road pavement structure, however, with the semi-rigid asphalt pavement, as well as the use of large quantities of their understanding of the depth, semi-rigid found cracks in asphalt pavement is the main disease, In addition, semi-rigid structure of asphalt pavement poor drainage conditions, could easily lead to semi-rigid asphalt pavement grassroots scouring jack slurry, layer void, and other diseases .With strict grading requirements of the grade gravel as a semi-rigid base gravel and asphalt on the road between the grass-roots level, in the function to be effective in the prevention and alleviation of reflection asphalt pavement cracks, drainage at the same time play the role of the grass-roots level. This paper will take shape based on DianZhang road,Based on research results from both at home and abroad on the basis of the graded gravel in the high altitude region of YunNan mechanical properties were studied.Through a large number of laboratory tests, graded gravel made CBR, shear, and other mechanical properties of dynamic triaxial test, CBR-matching on the value of the shear performance parameters, dynamic elastic modulus of the impact of the law, through CBR tests and shear tests have been graded the best and the biggest key sieve size and scope of change through reasonable rate. Yunnan against climate High Altitude Area of the peculiarities of the graded gravel made antifreeze performance test and permeability test, Bisar3.0 procedures that use graded gravel top surface of the maximum shear stress, and as a graded gravel shear indicators, based on the CBR to shear strength values and the control of two indicators graded gravel design method.Finally made for the high-altitude area of YunNan graded gravel construction technology...