Comparative evaluation of designing asphalt treated base mixture with composite aggregate types

Two types of composition methods, Coarse-Fine (C-F) composition method and Coarse-Coarse (C-C) composition method, were proposed and studied. Effective density was used in the mixture design to improve the accuracy on using composite aggregate. Research results illustrate that composite aggregate will change the volumetric properties of composite asphalt mixtures. The incorporation of alkaline coarse aggregates or surface roughness coarse aggregates on the aggregate can improve the mechanical properties of asphalt treated base. Asphalt mixture with composite of basalt and limestone aggregates can significantly enhance the moisture resistance property. Changing the types of coarse aggregates will result in more variables than changing the fine aggregates types.