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

Figure 10

SEM images of HMA at 160°C and optimized binder content of 4.12%: (a) asphalt mortar at magnification ×200 and bar scale 100 μm. (b) Voids in asphalt mastic at magnification ×2500 and bar scale 10 μm. (c) Filler particles in mastic at magnification ×5000 and bar scale 5 μm. (d) Asphalt binder film at magnification ×8000 and bar scale 2 μm. (e) Asphalt binder film at magnification ×30,000 and bar scale 0.5 μm. (f) Asphalt binder film at another location of the same sample at magnification ×30,000 and bar scale 0.5 μm. (g) Elemental composition of asphalt binder film at point Z in image (f) by EDS.

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