Voids in the Coarse Aggregate (VCA) is the volume between the coarse aggregate particles. This volume includes filler, fine aggregate, air voids, asphalt binder, and stabilizing additive (if used).
AASHTO R 46-08 specification covers the design of Stone Matrix Asphalt (SMA) based on the volumetric properties
of the SMA in terms of air voids (Va), voids in the mineral aggregate (VMA), and the presence of
For best performance, the SMA must have a coarse-aggregate skeleton with stone-on-stone
contact. The condition of stone-on-stone contact within an
SMA is defined as the point at which the VCA of the compacted mixture is less than the VCA of
the coarse aggregate in the dry-rodded test.
GCA = bulk specific gravity of the coarse aggregate, (AASHTO T 85);
γs = unit weight of coarse aggregate fraction in the dry rodded condition (AASHTO T 19), kg/m3 (lb/ft3); and
γw = unit weight of water, 1000 kg/m3 [62.4 lb/ft3].
Hot Mix Asphalt (HMA) consisting of a coarse aggregate skeleton with coarse aggregate-on-coarse aggregate contact (stone-on-stone contact) and a rich asphalt binder mortar. The coarse aggregate is generally considered to be that fraction of the aggregate retained on the 4.75-mm (No. 4) sieve but may be designated as other sizes.
Total volume of the small pockets of air between the coated aggregate particles throughout a compacted paving mixture, expressed as a percent of the bulk volume of the compacted paving mixture.
The volume of the intergranular void space between the aggregate particles of a compacted paving mixture that includes the air voids and the effective binder content, expressed as a percent of the total volume of the specimen.
The volume between the coarse aggregate particles, which includes the volume of filler, fine aggregate, air voids, asphalt binder, and stabilizing additive (if used).
A mixture of asphalt binder, filler (material passing the 0.075-mm (No. 200) sieve), and stabilizing additive.
Either cellulose or mineral fiber.