Experience in Iowa with the use of sprinkle treatments to improve the frictional characteristics of pavement surfaces is described. A 5.3-mile (8.5-km) research project was constructed in 1978 to evaluate sprinkle treatment surfaces. Six different sprinkle aggregates were rolled into three standard mixes used for asphalt surface courses. The sprinkle aggregates were quartizite, crushed gravel, granite, expanded-shale lightweight aggregate, dolomite, and a limestone-dolomite mixture. Precoating of the chips is one of the most important aspects of successful sprinkle treatments. Poorly coated chips result in substantial losses of sprinkle aggregate from the finished surface. Lowering temperatures after drying the sprinkle aggregate yields better coating. Manipulating coated chips in small piles and lightly sprinkling them with water just before use reduce congealment problems. Friction testing has shown the greatest improvement when quartizite and expanded shale were used: friction numbers were 8 to 10 points higher than those for nonsprinkled sections. Sprinkle treatments also yield greater macrotexture. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 118-124
  • Monograph Title: Asphalt materials, mixtures, construction, moisture effects and sulfur
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00390800
  • Record Type: Publication
  • ISBN: 0309035546
  • Files: TRIS, TRB
  • Created Date: Dec 30 1984 12:00AM