Mix design method for asphalt paving mixtures

摘要

A mix design method for determining the gradation of coarse and fine aggregates to be combined to achieve a predetermined percentage of air void volume and voids in mineral aggregates for a given quantity of asphalt cement. The method uses a volumetric value known as the Riguez Index which is derived from a compacted representative sample of fine aggregates to be used in the mixing plant. Volumes of graded aggregate composites are calculated at various gradation values below the bulking point and compared with the Riguez Index thereby providing the basis for graphically selecting a particular gradation wherein an aggregate mixture of said particular gradation contains, when compacted, the desired predetermined void volumes. Coarse aggregates and fine aggregates are demarcated by the No. 4 screen.