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    Investigation of the Usability of Composite Aggregate in Highway Pavement Construction: A Case of Asphalt Wearing Course
    (Kırıkkale Üniversitesi, 2022) Gedik, Abdulgazi
    Some restrictions and difficulties during the supply of aggregates from natural stone quarries adversely affect the production of hot bituminous mixture. It is thought that the combined use of aggregates obtained from different quarries may be effective both in terms of the environment and the efficacious use of natural resources. Therefore, this study investigated the incorporation of composite aggregate (basalt and limestone obtained from two different quarries) into asphalt concrete. The target performance graded binder (KMB 76-16) was obtained by modification of pure B50/70 bitumen with optimum amount (10%) of rubber. Then, a mixture design with this binder and composite aggregate (55% basalt and 45% limestone) was made. The mixtures to be used in the asphalt wear layer were produced according to the Marshall method. To further understand the effect of composite aggregate, mechanical properties (stability and flow) and volumetric parameters (voids in mineral aggregate, voids filled with binder, air void and volume specific gravity) of standard Marshall samples were investigated. The results indicate that the asphalt concrete with composite aggregate (basalt and limestone) and 5.7% rubber modified bitumen meets the criteria stated in the Turkish General Directorate of Highways’ (KGM) specifications and can be used in the wearing course.