Distribution Characteristics of Coarse Aggregate Contacts Based on Digital Image Processing Technique

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China Journal of Highway and Transport ›› 2014, Vol. 27 ›› Issue (8) : 23-31.

SHI Li-wan¹, WANG Duan-yi¹, CAI Xu², WU Zhi-yong^1,3

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Abstract

To provide reference for gradation optimization design of anti-rutting skeleton dense asphalt mixture, based on rutting test of asphalt mixture, the distribution characteristics of coarse aggregate contacts in asphalt mixture were studied. By using two-dimensional digital image processing technique, the internal structure characteristics, such as the development rules of coarse aggregate contacts under repeated loads, contribution rates on contact points for every graded aggregates and contact points distribution of single coarse aggregate particle, were studied through the comparison of three different types of asphalt mixtures. The results indicate that the unrestrained coarse aggregate particles are few, the number of single coarse aggregate particles with three or more contact points accounts for a larger proportion of total quantity, and the quantity of single coarse aggregate particles with two contact points is peaked, which are the major characteristics of a stable skeleton structure formed by coarse aggregates. Using high PG grade asphalt and a proper increase in coarse aggregates whose particle sizes are greater than 4.75 mm can effectively increase the rut resistance performance of asphalt mixture.

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road engineering / asphalt mixture / rutting test / coarse aggregate contact / two-dimensional digital image processing technique / skeleton structure

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SHI Li-wan, WANG Duan-yi, CAI Xu, WU Zhi-yong. Distribution Characteristics of Coarse Aggregate Contacts Based on Digital Image Processing Technique[J]. China Journal of Highway and Transport, 2014, 27(8): 23-31

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Received	Published
2013-10-21	2014-08-20
Issue Date
2014-10-09

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