Evaluation of Fine Aggregate Particle Shape and Texture

by E. R. Brown, Natl Cent for Asphalt Technology, United States,
P. S. Kandhal, Natl Cent for Asphalt Technology, United States,
James W. Winford, Jr., Natl Cent for Asphalt Technology, United States,



Document Type: Proceeding Paper

Part of: Materials: Performance and Prevention of Deficiencies and Failures

Abstract: In an effort to minimize or eliminate permanent deformation (rutting) of heavy duty asphalt pavements most governing agencies now limit the amount of natural sand which generally (not always) has rounded particles and thus tends to decrease the mixture's resistance to permanent deformation. However, the use of collective terms such as manufactured sand or natural sand in standard specifications is not logical. There exist many natural sands which are inherently subangular rather than round in shape. Also, there are crushed sands which tend to be subrounded rather than angular. In this study 10 fine aggregate (5 natural and 5 manufactured) were examined and classified according to their particle characteristics. The sands were classified using a number of methods for quantifying the surface texture of fine aggregate. The measured results for natural and manufactured sands were compared for each classification method. It is known that in general the surface texture of manufactured aggregates is rougher than that of natural sands. Correlations between the various test methods were compared.

Subject Headings: Soil deformation | Particles | Sandy soils | Aggregates | Pavement rutting | Asphalt pavements | Sand (material) | Load and resistance factor design

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