Open Graded Asphalt Friction Course: State of the Practice
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Open Graded Asphalt Friction Course: State of the Practice

Filetype[PDF-393.78 KB]


English
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  • Publication/ Report Number:
    Report No: NCAT Report No. 98-7
  • Resource Type:
    Research Paper
  • Corporate Publisher:
    National Center for Asphalt Technology (U.S.)
  • Abstract:
    Open Graded Friction Course (OGFC) has been used since 1950 in the United States to improve the frictional resistance of asphalt pavements. However, experience of states with this kind of mix has been widely varied. While many transportation agencies have reported good performance, many others have stopped using OGFC due to poor performance. This report presents the results of a survey of state transportation agencies in the USA carried out to determine where OGFCs have been used, why they are used in some places and not others, mix design and construction practices, OGFC's performance history, and problems encountered. The survey showed that significant improvements have been observed in the performance of OGFCs since their introduction in the 1950s. These improvements have been achieved with the help of good design and construction practices. Although experience of transportation agencies with OGFC has been widely varied, half of the agencies surveyed in this study indicated good experience with OGFC. More than 70% of the agencies which use OGFCs reported service life of eight or more years. About 80% of the agencies using OGFCs have standard specifications for design and construction. A vast majority of agencies reporting good experience use polymer modified asphalt binders. Also, gradations of aggregates used by these transportation agencies tend to be somewhat coarser compared to gradations used earlier and gradations used by the agencies which had bad experience with OGFC. It seems that good design and construction practice is the key to improved performance of OGFC mixes. An improved mix design procedure is needed to help the transportation agencies adopt these good practices. Graphs, tables, appendix. 31p.
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