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State of the Practice: Permeable Friction Courses.
| 题名： | State of the Practice: Permeable Friction Courses. |
| 作者： | stanard, c. candaele, r. charbeneau, r. barrett, m. |
| 关键词： | runoff, hot mix paving mixtures, friction tests, porosity, voids, drainage, design, hydraulic conductivity, surveys |
| 摘要： | Permeable Friction Courses (PFC) are open-graded bituminous mixtures placed over an impervious base. The interconnected air voids allow rainwater to drain into the pavement thus providing a safer driving surface in wet weather and a filter for highway runoff. This report summarizes the current state of the practice related to the hydraulic properties, water quality benefits, and maintenance of PFC based on literature from around the world. Porous pavements reduce pollutant concentrations in the highway runoff during the functional service life of the pavement, which ultimately results in the clogging of the pavement. This material accumulating in the pores was found to have high concentrations of pollutants, such as heavy metals. Pavement cleaning machines used in Europe to remove accumulated pollutants are described and usually found to maintain the function of the pavements. Existing research also includes measurements of hydraulic conductivity over time and from different pavements. In winter conditions, more maintenance is required for PFCs than for conventional pavements since the air voids change with ambient air temperature casing the PFC to freeze faster than conventional pavement. / NOTE: Technical rept. (Sept. 1, 2006 - Aug. 31, 2007). / Supplementary Notes: Sponsored by Texas Dept. of Transportation, Austin. Research and Technology Implementation Office. and Federal Highway Administration, Austin, TX. Texas Div. / 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： | u0822；60p |
| 报告类型： | 科技报告 |
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