Abstract
Mixture homogeneity of wearing course in the asphalt pavements plays an important role in pavement performance and life. Mixture homogeneity can be evaluated by various methods. One of these methods is the extraction method. In this study, effect of asphalt pavement thickness on homogeneity was investigated. Core samples taken from actual asphalt pavement were evaluated in terms of density, bitumen content and gradation values depend on pavement thickness. It was observed that the density values of the core samples were above the design density and the density decreased with increasing pavement thickness. However, after the pavement thickness exceeded 6.5cm, the decrease in density values accelerated. High coefficient correlation was not found between pavement thickness and bitumen content. However, the average bitumen content of the core samples was 0.2% greater than the design bitumen content. Although the pavement thickness changed, the aggregate gradations were very close to each other and the highest distortion according to the design gradation was between 0.18mm and 2.0mm sieves.
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