Abstract
The objective of this study was to compare rutting resistance of hot mix asphalt (HMA) containing fine aggregates with different angularities. Rut depths were measured using the Asphalt Pavement Analyzer (APA). HMA mixtures were designed following the Superpave specifications, to the extent possible, and prepared using the Superpave gyratory compactor. Six different mixtures were prepared using the same gradation. In all mixtures, crushed limestone was used as the coarse aggregate. Six different fine aggregates were used: crushed granite, crushed river gravel, crushed limestone, sub-rounded natural sand, blend of 85% granite with 15% natural sand, and blend of 70% limestone with 30% natural sand. Angularity of the fine aggregates was measured using Superpave fine aggregate angularity (FAA), direct shear test, compacted aggregate resistance (CAR), and VDG-40 videograder. Friction angle derived from direct shear tests and slenderness ratio from the image analysis showed good correlations with rut depth.
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