• Ouf, Mohamed Elsadek
• Abdolsamedp, Abdelbaset A.

Abstract

ABSTRACT: The Bailey Method provides a set of tools for the design and the evaluation of aggregate packingand voids of asphalt concrete grading while maintaining appropriate mixture workability and durability.The objectives of this research was using “Bailey Method” to evaluate using of Marshall stability, flow, andstiffness index to predict rutting, and to investigate the Bailey ratios for all different blends for prediction of rutting.Two types of aggregate blends were prepared. Different aggregate gradations were used in this research includedcoarse, open and dense gradations then rutting performance was evaluated. The results proved that Baileymethod is a useful tool in evaluating aggregate blends. Mixes with coarser gradation produced more resistance torutting than dense or open gradation mixtures. Controlling aggregate ratios gradations could control anticipatedmix properties and predict permanent performance of HMA. Key words: Bailey methods, hot mix asphalt, rutting, wheel tracking, Marshall.——————————  ——————————1. Introduction The aim of HMA design is to find the optimum combination of aggregate, void spaces, andasphalt binder to ensure that the pavement exhibits the desired performance and durabilityproperties. Aggregate grading is an essential property of bituminous mixtures, as it can berelated to many aspects of mixtures performance in the field, such as durability and resistanceto permanent deformation. Such complex circumstances make pavement materialperformance assessment an aspect of great importance for any project. Selection of properpavement material of adequate structural performance may increase the effective life of thestructure, while requiring less maintenance and repair measures, (Tabatabaeea, 2012). Brown and Cross (1989) suggested that Marshall flow is a good indicator of rutting potential.In acceptable mix design and construction, Marshal flow should be less than 16, and mixtureswith Marshall flow exceeding 16 tend to have a higher amount of rut (Abukhettala, 2006).Stiffness Index, which is Marshall stability divided by Marshall flow, estimates loaddeformation characteristics of the mixture, and indicates the material resistance to pavementrutting (Asphalt Institute, 2001). A mixture with high Marshall stiffness is a stiffer mixture,that can resist pavement rutting (Abukhettala, 2006). Voids in the mineral aggregate (VMA) requirements are specified to allow what is consideredthe proper balance of air voids an

Topics

• impedance spectroscopy
• mineral
• laser emission spectroscopy
• void
• durability