Estimating the Asphalt Binder Film Thickness Using Scanning Electron Microscope and Energy Dispersive X-Ray Spectroscopy

Table 2

Asphalt Institute (AI) surface area factors.

Sieve size (mm)	+25	25	19	12.5	9.5	4.75	2.36	1.18	0.60	0.30	0.15	0.075
Surface area factors (m^2/kg)	0.41	0.41	0.41	0.41	0.41	0.41	0.82	1.64	2.87	6.14	12.29	32.77