PERFORMANCE OF POROUS ASPHALT MIXES IN A LABORATORY TEST TRACK

The permanent deformation and fretting (loss of mortar and stones) has been investigated under semi-practical conditions in a circular test track. In this track 0.80 m long and 600 mm thick asphalt sections were laid on top of a 20 cm thick cement-stabilized sand base. The composition of the permeable asphaltic concrete was: 85% gravel and 2-12 mm, 10.5% w crushed sand, 4.5found w filler, 4.2 pha binder, and 18% (approx) voids content. A dense coarse asphaltic concrete was included for comparison. Apart from the use of a conventional 80/100 pen bitumen with both mix types an additional step was applied in which the sand and stones were precoated with about 1.5 pha of a special bitumen to obtain improved adhesion. Details of the study are outlined. It was found that the permanent deformation of blank porous asphalt mix is only slightly higher than that of the dense mix. The resistance to permanent deformation is slightly increased by using a doped bitumen and further increased by using precoated aggregate. The best results are obtained by combining the precoating with the use of a premium binder. As the number of wheel passages increased, loss of mortar and stones was observed in various sections starting from the outer side of the wheel track. All studies show that the use of modified binders, combined with precoated aggregate, will increase the durability of porous mixes.

• Supplemental Notes:
  • Proceedings of International Symposium on Porous Asphalt, Amsterdam, Netherlands, May 31 to June 2, 1976.
• Corporate Authors:

  Study Centre for Road Construction, Netherlands

  14a Jansbuitensingel
  Arnhem,   Netherlands 
• Authors:
  • VISSER, W
  • Claessen, AIM
  • Hofstra, A
• Conference:
  • Proceedings of International Symposium on Porous Asphalt, Amsterdam, Netherlands, May 31 to June 2, 1976.
• Publication Date: 1977

Media Info

• Features: Figures;
• Pagination: p. 196-199

Subject/Index Terms

• TRT Terms: Asphalt concrete; Asphalt mixtures; Binders; Bitumen; Circular test tracks; Deformation; Laboratory studies; Pavement performance; Pavements; Porous materials; Porous pavements; Precoated aggregates; Stripping (Pavements)
• Old TRIS Terms: Fretting; Wheel path
• Subject Areas: Construction; Geotechnology; Highways; Pavements;

Filing Info

• Accession Number: 00163677
• Record Type: Publication
• Report/Paper Numbers: S.C.W. Record 2 Proceeding
• Files: TRIS
• Created Date: Mar 14 1978 12:00AM