RECYCLING PCC ROADWAYS IN OKLAHOMA

The first portland cement concrete (PCC) pavement recycling project in Oklahoma is described. The project consisted of 7.75 miles of Interstate 40 east of Oklahoma City. The original pavement had passed its design life of 20 years and had experienced moderate D-cracking. The deteriorating 9-in. slab was replaced by a 10-in. slab. As a result of this demonstration project, recycling existing PCC pavements into coarse aggregate was shown to be practical. Sufficient coarse aggregate can be produced to replace old pavements with new pavements. The recycled PCC has the workability and meets the strength requirements of virgin mix PCC. Although a comparison of energy requirements between the recycled PCC alternative and an asphaltic concrete overlay of approximately 9 in. showed no significant difference, the contractors' bids did. The asphaltic concrete overlay was bid at $5.9 million, and the PCC recycle alternative was bid at $5.2 million. Previous research had suggested that the original D-cracking problem had been reduced in two ways. First, the original 1.5-in. coarse aggregate was downsized to 0.75 in. Also, 85 lb of portland cement was replaced with 115 lb of fly ash per cubic yard of concrete.

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 1-4
  • Monograph Title: Construction: quality control and specifications
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00399157
  • Record Type: Publication
  • ISBN: 0309037700
  • Files: TRIS, TRB
  • Created Date: Jan 31 1986 12:00AM