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Abstract Asphalt cement is considered one of the important components of hot mix asphalt (HMA). Modifying properties of asphalt enhances the mechanical properties of HMA. The practical experiences of the Egyptian highway network showed that a high percentage of roads is suffering from fatigue, creep and rutting in the long term. These stresses may be occurred due to the shortage in the mechanistic properties of either the binder or the asphalt mixture as well as the increasing of traffic loads. Therefore, utilizing asphalt additives for enhancing the HMA performance has gained great attention from researchers. This study aims to investigate the possibility of using different types of additives ; nonterminals (Nano-Clay (NC) or Nano-Silica (NS) and High-density polyethylene (HDPE), separately or as composites to improve the properties of Hot Mix Asphalt (HMA) concrete mixtures. To achieve these objectives, a control mix was prepared by blending coarse and fine aggregates with asphalt cement of 4.0, 4.5, 5, 5.5, and 6 percentages of their weight. The control mixture with the optimum percentage of asphalt was modified with the previously suggested additives. |