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Addressing Safety Through Evaluation and Optimization of Permeable Friction Course Mixtures.
| 题名： | Addressing Safety Through Evaluation and Optimization of Permeable Friction Course Mixtures. |
| 作者： | A. E. Alvarez; A. E. Martin; C. K. Estakhri; |
| 关键词： | hot mix asphalt,permeable friction course;total air voids, mixture stability, functionality, permeability, image analysis, tomography; |
| 摘要： | Permeable friction course (PFC) mixtures are a special type of hot mix asphalt characterized by a high total air voids content to guarantee proper functionality and stone-on-stone contact of the coarse aggregate fraction to ensure adequate mixture stability. Thus, PFC mixtures constructed in a thin layer at the surface of a pavement structure produce several benefits in terms of economy, safety, and the environment. This project focused on the analysis of functionality (i.e., drainability), stone-on-stone contact, and mixture internal structure to propose improvements in these three aspects for PFC mix design and evaluation. The analysis was based on both a macroscopic assessment of mixture properties and a study of internal structure using X-ray Computed Tomography (X-ray CT) and image analysis techniques. The assessment of drainability led to a recommendation to use the expected value of permeability (based on a modified Kozeny-Carman equation) for analytical prediction of permeability. The wateraccessible AV content was also proposed as a surrogate of the total AV content for indirect assessment of permeability. / Supplementary Notes: Sponsored by Southwest Region Univ. Transportation Center, College Station, TX. / 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 5301 Shawnee Road, Alexandria, VA, 22312, USA. / NTIS Prices: PC A06 / NTIS In-house Control Codes: utatti;12091,1101 |
| 报告类型： | 科技报告 |
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