Recent efforts relating pavement failure to binder hardening have resulted in a pavement oxidation model. A key parameter, the diffusion depth, the ratio of binder volume to accessible air void surface area, is determined via X-ray computed tomography (CT). Toward an alternative determination, in this work volumetric techniques were employed to measure total air voids of core slices over the pavement depth. Because the 0.4-inch-thick slices are insufficient to meet standard method specimen size requirements, precision was evaluated and alternative maximum theoretical specific gravity methods were compared. A vacuum dryer increases efficiency without oxidizing the binder. Air void distributions compare favorably with X-ray CT measurements.
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