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- 9. Minimum VMA recommended by Asphalt Institute Nominal Max Particle Size (mm) Minimum VMA, percent Design Air Voids, % 3.0 4.0 5.0 1.18 21.5 22.5 23.5 2.36 19.0 20.0 21.0 4.75 16.0 17.0 18.0 9.5 14.0 15.0 16.0 12.5 13.0 14.0 15.0 19.0 12.0 13.0 14.0 25.0 11.0 12.0 13.0 37.5 10.0 11.0 12.0 50 9.5 10.5 11.5 63 9.0 10.0 11.0