Bleeding is one of the most common failures of asphalt pavements in tropical countries. Bleeding can be dangerous because of reducing skid resistance of the vehicles, especially when the pavement surface is wet. Bleeding has been dealt with in the asphalt concrete literature as occurring mostly due to poor construction practices and other than empirical and qualitative observations, there have not been any attempts to understand its mechanism. The aim of this study was to evaluate the analytical-empirical bleeding mechanism in asphalt mixtures. This evaluation is based on the distribution of air voids in asphalt mixtures. An x-ray computed tomography system was used to capture the internal structure of the specimens, and image analysis techniques were used to quantify the air void distribution. Two different methods were conducted in this study. The first method was, conventional method, based on extraction tests were performed according to the standard ASTM-D2172 and including preparing specimens, impact loading, static loading, and extraction test. The second method was carried out based on image analysis that after the specimen was initially scanned using X-Ray CT, dynamic loading was applied by UTM 5KN at temperatures of 5, 25, 40 and 60°C. Static loading test was applied by uniaxial compressive machine at temperatures of 25, 40 and 60°C. The specimens were scanned after loading again. Image processing and analysis software were used to quantify the air void distribution in X-ray CT images. The software quantifies the vertical distribution of air along the depth of each specimen by calculating the percent area on each CT image. X-ray CT along with image analysis techniques were shown to provide a non-destructive and accurate tool to analyze the air void distribution in asphalt mixes. According to the stress-strain results obtained from dynamic loading and variations of air voids distribution in specimens can be expressed asphalt mixtures under low frequency loading have more strain and less air voids. On the other hand, it can be concluded that the pavement under heavy truck traffic is more likely to bleeding due to reduced air voids in asphalt mixture. Also according to changes in air voids distribution under thermal loading conditions 5, 25, 40 and 60°C can be concluded at low temperature, asphalt cement behaves like an elastic solid and with increasing temperature, this behavior will tend towards plastic manner. Key Words: Asphalt mixture; Bleeding; Air voids; Image analysis; X-ray CT.