Compaction Effort Evaluation of Crumb Rubber Modified Hot Mix Asphalt

The primary goal of this study was to obtain the same performance from an asphalt mixture made using a Marshall impact hammer (MIH) as Superpave gyratory compactor (SGC). This due expense equipment compared with equipment. A wet process used blend CR PG 70-16 asphalt. crushed stone aggregate 19 mm nominal maximum size, and samples were prepared SGC MIH. results show that nine percent determined be optimum crumb-rubber content (OCRC). In addition, provided excellent in stability, density, tensile strength, compressive strength at different numbers blows gyrations Moreover, MIH required approximately 21, 18, 24 extra respectively, design number (Ndesign). Furthermore, modified mixtures OCRC increased range 16 48 had higher values on index retained than unmodified mixtures. As result, they less susceptibility moisture damage. significance is performed obtained only