An X-Ray CT Validated Laboratory Measurement Method for Air Voids Distribution Over Depth in Asphalt Pavement: A Step Toward Simplified Oxidation Modeling

作者：Rose A A; Arambula E; Howell T; Glover C J

来源：Petroleum Science and Technology, 2014, 32(24): 3020-3028.

DOI：10.1080/10916466.2014.945598

• pavement oxidation modeling
• diffusion depth
• X-ray CT
• core slice air voids
• volumetric air voids distribution
• volumetric measurement precision
• core vacuum drying
• asphalt carbonyl

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.

• 出版日期2014