Semnan University Press Journal of Rehabilitation in Civil Engineering 2345-4415 6 1 2018 02 01 Internal Structure Features of Asphalt Mixture for Field Samples 10 20 2613 10.22075/jrce.2017.11579.1194 EN Mahmood Reza Keymanesh Associate Professor, North Tehran Branch, Payam Noor University Ali Nasrollahtabar Department of Civil, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran Nooshin Shahryari M.Sc. Graguated, Faculty of Engineering, Payam Noor University Journal Article 2017 06 08 Asphalt mixture is heterogeneous in nature; consequently, macroscopic parameters alone cannot describe the mechanical behavior of the mixture. In recent years, the arrangement of the aggregate particles in terms of spatial and directional distributions, and contact points are contemplated as the internal structure of asphalt. The main purpose of this article is to examine the microstructural characteristics of asphalt cores applying 2-D images. Comparison between the internal structure features in the laboratory samples and the Field samples is indicated in this paper. The results reveal that the survey of microstructural characteristics of asphalt cores by image processing provides new and functional information. This finding indicates that the number of contact points in cores is close to the lab samples that have been made at 45 to 65 blows on each end of the sample. https://civiljournal.semnan.ac.ir/article_2613_e91fa9cda975778e759492098fcb5cd6.pdf