Research on Voids in Coarse Aggregate of Asphalt Mixtures with Digital Image Processing and Probability Statistics

Abstract:

Voids in coarse aggregate of asphalt mixtures(VCAmix)is one of the most important volumetric properties of asphalt mixtures.Digital image processing technique is adopted to distinguish the coarse and fine aggregate with red stones as coarse aggregates and common stones as fine aggregates.Further more,the specimen is cut into slices and probability statistics theory is used to put forward a method that calculating the coarse aggregate’s volume distribution in 3D space from its area distribution in 2D section.At last,how to determine the number of slices and the relation between slices and the guarantee rate is introduced.Results show 40 slices can satisfy the requirement of engineering accuracy.

Key words:road engineering; asphalt mixtures; voids in coarse aggregate of asphalt mixtures; digital image processing; probability statistics