Study On Material And Structure Characteristics Of Graded Gravel Base Asphalt Pavement

Semi-rigid base is prone to producing shrinkage cracks under change of temperature and moisture content. These cracks may lead to appear reflective cracks in asphalt layer and induce other distresses. In view of this condition, from the Angle of pavement structure, how to reduce the early damage of asphalt pavement is imminent, we should change the pavement structure.This paper researched the graded gravel asphalt pavement and the semi-rigid base asphalt pavement with graded gravel upper base.First of all, Based on dense framework type grade provided by our specifications, through the filling test, it optimized the framework structure by stuffing theory and tested the performance through CBR and rutting test.Secondly, according to dynamic triaxial test, it analyzed the influence of confining pressure, eccentric compression, grade, water content and maked regressive analysis by the k-θmodel. obtained three kinds of class with water content in the best regression equation of the modulus.Then,, through the experimental data, using nonlinear least squares method, Fitted and regressed two structure asphalt pavement of the three graded gravel aggregate base of permanent deformation of the formula.Take into account non-linear characteristics of graded gravel, By choosing different structure parameters, it maked mechanical analysis of two structure asphalt pavement through KENLAYER, and obtained the structural parameters on the surface of various responses values, given the order of graded gravel layer elastic modulus..According to the flexible pavement design method of domestic and foreigh, and consider the structural parameters of the road affected by the force, through the graded gravel asphalt pavement analysis and calculation of stress and strain and proposed the reasonable graded gravel asphalt pavement structural design methods which suits our country.At last, through the experiment of engineering practice, it studied the construction technology and method of quality control for graded aggregate.