The increasing costs of construction materials, along with environmental conditions, have given great impetus to current interests in recycling. In recent years, reuse or recycling of existing pavement materials has emerged as a workable rehabilitation and maintenance alternative because it offers several advantages over the use of conventional materials and techniques. Although the equipment and technology of recycling have been developed, there still is no standardized or widely accepted method for testing recycled mixtures. The practice of using a small amount of recycling agent is coupled with the problem of quality control. There is no suitable method of detecting how well the recycling agent mixes with the aged pavement materials. A study is described whose primary objective was to develop a test method that could be conducted in the field with a minimum of equipment and training. As a result, the dye chemistry technique was found to be the most practical method of measuring the extent of mixing during a recycling operation. Ten field projects involving various plant types were conducted to demonstrate the application of such a technique to full-scale construction conditions. The overall mixing efficiency of a specific operation can be evaluated by statistically analyzing the resulting dye distributions. Consequently, the mixing process or plant design can be optimized by obtaining such information. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 51-60
  • Monograph Title: Asphalt materials, mixtures, construction, moisture effects and sulfur
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00390790
  • Record Type: Publication
  • ISBN: 0309035546
  • Files: TRIS, TRB
  • Created Date: Dec 30 1984 12:00AM