Bleeding (roads)

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Bleeding or flushing is shiny, black surface film of asphalt on the road surface caused by upward movement of asphalt in the pavement surface.[1][2][3] Common causes of bleeding are too much asphalt in asphalt concrete, hot weather, low space air void content and quality of asphalt.[4] Bleeding is a safety concern since it results in a very smooth surface, without the texture required to prevent hydroplaning. Road performance measures such as IRI cannot capture the existence of bleeding as it does not increase the surface roughness.[2] But other performance measures such as PCI do include bleeding.[2][5]

See also[edit]


  1. ^ "Bleeding - Pavement Interactive".
  2. ^ a b c "Piryonesi, S. M. (2019). The Application of Data Analytics to Asset Management: Deterioration and Climate Change Adaptation in Ontario Roads (Doctoral dissertation)".
  3. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2014-01-07. Retrieved 2014-01-07.CS1 maint: archived copy as title (link)
  4. ^ "Archived copy". Archived from the original on 2013-10-29. Retrieved 2013-09-14.CS1 maint: archived copy as title (link)
  5. ^ Piryonesi S. Madeh; El-Diraby Tamer E. (2020-06-01). "Role of Data Analytics in Infrastructure Asset Management: Overcoming Data Size and Quality Problems". Journal of Transportation Engineering, Part B: Pavements. 146 (2): 04020022. doi:10.1061/JPEODX.0000175.