Improving the Design of Asphalt Mixtures by Superpave Method and Comparison it with Marshall Method
Keywords:
Asphalt mixture – Marshall method- Superpave - stability - indirect tensionAbstract
The purpose of bitumen mixture design methods is to determine the optimum bitumen content that would provide the basic requirements for asphalt mixtures, with regard to stability and durability. There are many methods of designing mixtures used throughout the world, the most famous of which is the widely used Marshall method, and recently the Superpave method, which began to spread since the year (2000). This research aims to shed light on the method of designing asphalt mixtures according to the new SUPERPAVE in Syria based on the characteristics of local building materials and climatic conditions, by describing the materials of asphalt mixtures according to the method of the superpave method, and studying the effect of gyratory compactor on the volumetric properties of bitumen mixtures, and from Then determine the optimum asphalt content and compare it with the Marshall method. The results indicated that the optimum bitumen according to the Marshall method (5.2%), while the optimum bitumen decreased according to the superpave method and reached (4.8%), and the stability value at the optimum bitumen (1225 kg) with the achievement of the flow rate criterion according to the Syrian specifications, as the results were filled and air voids are within the required limits, and the design results at the optimum asphalt according to the superpave method achieved the required standards for design, as the percentage of mineral voids (14.2%), filled voids (72.4%) and dust ratio (0.77), and the results of the indirect tensile test were shown according to the optimum bitumen design has achieved a sensitive standard Moisture
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