Abstract
Abstract The aim of this study is to know some of hot-mix-asphalt characteristics and performance, which use in the surface layer with fine aggregate gradation in flexible pavement by using Bejee Asphalt of grade 40-50 as a binder through administration experimental tests. The first stage including the experimental tests is to calculate the physical properties of the basic components of the asphalt mixture, and to make sureit'scompatible with the standards and the eligibility of usage. Then find the ratio of mixing by using Marshall Method to design the asphalt mixture. In the second stage, the experimental tests were conducted to determine the properties of the performance, and the effecting factors, which include, the repeated load test,the static load test, and then cohesion test.The resilient modulus of the asphalt mixture was found using repeated load test for the values of resilient modulus, were in positive relation with the applied pressure and inversely proportional with both the temperature and asphalt percentage in the mixture, the values of Resilient Modulus is varying between 423856,206625Psi.The test of static load calculate the total strain and stiffness of displacement and the total resulting displacement where the reaction increases and the distortion both increase according to the increase of temperature and applied pressure inversely proportional with stiffness values and positively with displacement values, stiffness values for mixtures in study varying between1.05×〖10〗^6, 4.28×〖10〗^6Kpa.Thecohesion coefficient for hot-mix-asphalt wascalculated to know the effect of asphalt content on mixture cohesion under grading different thermal.The results showed the increase of the values of cohesion coefficient with increasing of asphalt percentage, then began to decrease, whereas it inversely proportional with temperature.
