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Design of a High-Binder-High-Modulus Asphalt Mixture.
| 题名： | Design of a High-Binder-High-Modulus Asphalt Mixture. |
| 作者： | maupin, g. w. diefenderfer, b. k. |
| 关键词： | design, air voids, cracking, criteria, asphalt pavements, hot mix asphalts, layers, fatigue tests, durability, dynamic modulus, flexural stiffness |
| 摘要： | Recent studies on long-life flexible pavements indicate that it may be advantageous to design and construct asphalt mixtures comprising the underlying layers in such a manner that very dense mixtures are produced. This will improve not only the fatigue characteristics but also durability through a decrease in air voids. A 19.0 mm mixture was designed and tested at asphalt contents (ACs) higher than the optimum design level. Stiffer binder and recycled asphalt pavement (RAP) were employed to help maintain stiffness in order to prevent instability. The field voids were predicted to decrease approximately 1.0 to 1.5 percent for each 0.4 percent increase in AC, which would improve durability. Flexural stiffness peaked for an 0.5 percent increase in AC, and fatigue life trended upward but needed approximately 1.0 percent additional asphalt for a major beneficial effect. Permeability improved slightly as AC was increased. The researchers think that the Hamburg test would have been more appropriate for this study than the tensile strength ratio test, which indicated no improvement in stripping susceptibility with an increased AC, because it might simulate field conditions better. / NOTE: Research rept. Oct 04-Dec 06. / Supplementary Notes: Sponsored by Virginia Dept. of Transportation, Richmond. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0711；30p |
| 报告类型： | 科技报告 |
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