Evaluation of Mix Design for Asphalt Mixtures by Bailey Method

In general, there are needed lots of time and experiments for determination of optimum asphalt content and mix design. The experimental results are highly depended on the skill of testers. Bailey suggested the proper aggregate gradation of hot mix asphalt are a fucntion of special size and passing percent of the speicifed aggregateto reduce the test errors. In this paper, the asphalt mix designs of 19mm dense graded mix and PA-20mm for FHWAwere carried out, using Bailey's method. The use of Bailey method can cut down the testing times to get the properaggregate gradation for asphalt mix design. In case of 19mm dense graded asphalt mixture, the measured values ofCA, FA c , FA f are 0.724,, 0.440, and 0.455, which are within the suggested values by Bailey. Also, in case of PA-20graded asphalt mixture, the measured values of CA, FA c , FA f are 0.646, 0.476, and 0.450, repectively. Key Words : Aggregate Gradation, Bailey Method, Dense Graded Asphalt, Primary Coarse Aggregate