Properties of Direct Coal Liquefaction Residue Modified Asphalt Mixture

Table 6

Volumetric indexes of the asphalt mixtures.

Items	SK-90 asphalt mixture	SBS modified asphalt mixture	DCLR modified asphalt mixture	DCLR-composite modified asphalt mixture
Bulk relative specific gravity/(g/cm^3)	2.422	2.560	2.503	2.547
Maximum theoretical specific gravity/(g/cm^3)	2.596	2.615	2.632	2.623
VV/%	4.4	4.5	4.3	4.6
VMA/%	13.3	13.3	13.2	13.3
VFA/%	68.1	65.2	67.4	66.5
OAC/%	4.2	4.2	4.2	4.3

Note: VV: volume of air voids; VMA: volume of voids in mineral aggregate; VFA: volume of voids filled with asphalt; and OAC: optimum asphalt content.