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The air void and aggregate content of asphalt core samples could be determined by direct and indirect methods. Direct methods are destructive since they determine the air void and aggregate content by decomposing the mix into its individual components. The computed X-ray tomography (CT ) makes it possible to create a 3D image of the complete inner structure. This paper demonstrates the CT method for determining the air void content in asphalt. It shows that the proposed method can determine the air void and aggregate content and gives multiple additional information about other features by showing the distribution along the vertical axis of the core sample. [ABSTRACT FROM AUTHOR]