Effect of Test Geometry and Aggregate Texture on Angle of Repose of Aggregates

Properties of asphalt concrete mixtures are significantly affected by aggregate properties. Previous studies have indicated that Angle of Repose (AoR) is an indicator of aggregate properties, including texture, angularity, and shape. In this research, the effect of test geometry and aggregate texture on the AoR of aggregate is evaluated. Aggregates from two different sources were synthetically processed in a laboratory to obtain particles with different textures while retaining other characteristics. The AoR of single-sized aggregates was measured with different test geometries. The test results indicate that measured AoR was sensitive to aggregate texture and test geometry. The relation between aggregate size and AoR exhibited a positive correlation. The direct shear strength test parameters were able to capture the changes in aggregate texture and AoR. The angle of internal friction showed a positive and linear variation with AoR, irrespective of test geometry. However, exact slope was specific to aggregate type and texture level.