Open graded porous asphalt (OGPA): Auckland cleaning trial

This paper examines the use of Open Graded Porous Asphalt (OGPA) on the Auckland State Highway network and the issues faced with the clogging of the material over time with detritus. The paper includes a summary of the make up of OGPA, its expected life cycle, and how the water draining characteristics of the material function. Two major changes happen over time when the OGPA becomes clogged. The first is the build up of detritus, which from stereoscopic photography looks like cement. This physically clogs the voids and reduces the effectiveness of the OGPA attributes. The second is the oily material that accumulates in the voids and comes to the surface during rain. This material may contribute to loss of control accidents as evidenced by the fourfold increase in autumnal accidents. For each trial, the methodology used for the cleaning process is discussed along with the test methods, environmental considerations and test results for each site compared with the age of the OGPA. Testing of the level of contaminants removed from the seal is also included to give an insight into the environmental effects of cleaning, or not cleaning, OGPA. (a) For the covering entry of this conference, please see ITRD abstract no. E214098.

  • Authors:
    • BANKS, I
  • Publication Date: 2005-11


  • English

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Filing Info

  • Accession Number: 01043104
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Mar 6 2007 8:16AM