The purpose of this paper is to obtain the pore distribution of asphalt mixture accurately by nondestructive technology. Specimens\nprepared with four gradations of asphalt mixtures were scanned using X-ray computed tomography (CT) which was used to\nmeasure air void sizes at different depths within specimens. The air void distributions of obtained CTimages were analyzed using\nring blocking segmentation combining Otsuâ??s method, which provided an accurate estimate of air voids in asphalt mixtures.
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