In the summer of 1979 a hot recycled pavement project was constructed in the towns of Edinburgh-Howland-Mattamiscontis and T2 R8. The top 2-1/2 inches of binder and wearing couse on a 17 mile section of the southbound land of I-95 was removed with a PF-750 CMI rotomill. The material was then recycled through a Boeing Drum Mixer, using 100 percent milled material and 1/2 percent of Cyclogen L for a softening agent. The recycled course was completed in approximately 1 month and then covered with a 1 inch overlay of new wearing course. The specifications for this project was based upon using a 50-50 mixture with a hot contact process rather than the drum mixer approach. As a result, the specifications had to be adjusted. One of the major adjustments was the requirement for a softening agent. The softening agent was paid for as an extra item and this increased the price of the hot mix approximately two dollars per ton. The principle reason for the high cost of the softening agent was shipping charges from California to Maine. Cost comparison of alternate methods of construction revealed that the recycling method saved $1.15 per square yard more than the conventional 3 inch overlay alternate. The actual saving was due to the fact that only 1 inch of mix was required to bring the shoulders to a matching grade for the recycled method, versus 3 inches needed for the overlay method. This represented a savings of $275,168. The recycling method was primarily selected because this method removed the old racked pavement, therefore reducing the chance for reflective cracking. A comparison study of the energy saved for recycled versus virgin mixture indicated 4.8 equivalent gallons of gasoline was used per ton of recycled mixture versus 3.6 equivalent gallons of gasoline used per ton for the 1 inch virgin mix. (FHWA)

Media Info

  • Features: Appendices; Figures; Tables;
  • Pagination: 70 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00319187
  • Record Type: Publication
  • ISBN: Proj No. I-95-8(117)
  • Report/Paper Numbers: FHWA-ME-TP-80-4
  • Contract Numbers: DOT-FH-15-345
  • Created Date: Jan 19 1981 12:00AM