This paper describes how Open Graded Asphalt (OGA), also known as porous asphalt, is commonly used as a road surface for urban freeways/motorways in Australia in order to reduce traffic noise and suppress water spray. International experience has shown that these functional properties of OGA deteriorate over time. However, few studies of the deterioration rate of these functional properties have been undertaken in Australia. A study was therefore undertaken to assess if prevailing environment, traffic and typical pavement configurations in Victoria, Australia produced similar deterioration rates to those observed in Europe. While maintenance and cleaning of OGA to restore functional attributes is common in Europe, trials have only recently been performed in Australia. Commencing in 1998, VicRoads, the state road authority of Victoria, undertook a research project that aimed to investigate deterioration rates in the tire road noise and vehicle generated water spray suppression characteristics of OGA. The project initially involved a literature review, then development of suitable measurement technologies for tire road noise and water spray. This was followed by assessment and monitoring of these functional characteristics. The assessment was conducted on a series of heavily trafficked urban freeways around Melbourne, the capital of Victoria. An earlier study reported on the methods developed to perform this monitoring and the early test results. This paper briefly reports on the conclusion of the project, including an assessment of the functional durability of open graded asphalt and the potential of its restoration on freeways in Melbourne.


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  • Accession Number: 00964439
  • Record Type: Publication
  • ISBN: 087659229X
  • Files: TRIS, ATRI
  • Created Date: Oct 24 2003 12:00AM