Asphalt mixture contains approximately 90–95% of mineral-aggregate by weight and the gradation of aggregate considers one of the key properties in the aggregate blend. Therefore, the aggregate gradation influence on the asphalt mixtures performance is a considerable problem. Mid-limit gradation curve is recognized as the most proper gradation, but does not all the time produce preferable results. The Bailey method provides a means for designing of aggregate gradation in asphalt mixtures, taking into consideration the volumetric aggregate blend characteristics, in order that asphalt mixtures exhibited a strong-skeleton for high stability and appropriate VMA for good durability. Bailey method calculations are time consuming. Therefore, Excel spreadsheet is developed in order to save time and decrease the calculation errors.Eight aggregate blends, which involve fine and coarse graded mixtures with four blends for each of the two types of mixtures, are designed for the evaluation of Bailey method and the optimum-asphalt-content is identified for each-gradation. The tests utilized for identifying the volumetric asphalt mix properties are conducted to find the effect Bailey parameter on the volumetric asphalt mix properties.

Topics
Materials analysis, Educational assessment
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