Abstract
The use of reclaimed asphalt pavement (RAP) in cold foamed asphalt mixture can decrease the need of fresh aggregate and bitumen, reduce fuel consumption and CO2 production. A cold foamed asphalt using RAP material is a unique asphalt mixture. Performance of these materials will be affected by mix design process. This paper discusses about mix design consideration for these mixture especially to set the aggregate and foamed bitumen properties properly. The method used to propose mix design consideration in this paper is by analyzing results of the long research work about foamed asphalt and RAP materials in laboratory. It is found that the optimum value of foamed bitumen properties is affected by bitumen grade, foam characteristic, water content at foaming, and temperature of bitumen. The best aggregate properties should consider the plasticity index, aggregate gradation, and the percentage of RAP proportion. The percentage of RAP proportion influence specific gravity, mixture density, volumetric characteristic, and mixture performance.
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