AbstractsEngineering

This project involves the investigation of the effect of various fine aggregates on the Marshall properties of a gap-graded asphalt mixture. A total of eight different fine aggregates were obtained from commercial sources around Rockhampton. Aggregates selected varied from quarry fines to river sand. Classification of fine aggregates was by Sutherland and Neale's 1 Shape Factor and volumetric flow rate. A design for a gap-graded ashphalt mixture was selected. Mixture grading was kept constant throughout the investigation, the only variables being the binder content, compaction, and type of fine aggregate. Four of the original fine aggregates were investigated using the Marshall method, and the results evaluated in terms of Shape Factor and volumetric flow rate of the fines. Ease of compaction, in terms of VMA of the various mixtures was also investigated at a range of compactive efforts and binder contents.