UTILIZATION OF RECYCLED PCC AGGREGATES FOR USE IN RIGID AND FLEXIBLE PAVEMENTS

The study reported herein was conducted to demonstrate the feasibility of using recycled crushed concrete from old pavements as aggregates in new PCC and asphalt pavements and to develop guidelines and criteria for making cost-effective decisions concerning the recycling of PCC pavements. This study included several activities such as: preconstruction evaluation of recycled PCC aggregates, construction monitoring and evaluation of mixes, post construction evaluation of mixes and data analysis. Four test sections, each approximately 1146 ft (349.3 m) long, were constructed on a roadway segment in Toledo area located on I-475 (Lucas County). Each lane of this four lane road contained a PCC recycled aggregate section, PCC control section, AC recycled aggregate section and AC control section. Cores of the old pavement (PCC) were obtained before their removal and tested in the laboratory. The aggregates from the crushed cores were then used to prepare trial mixes and measure the strength characteristics of the recycled mix. A crushing plant was designed and constructed at a quarry site to crush old pavements. This plant produced recycled aggregates for use in the mixes of test sections. Samples of recycled aggregates were used to design a mix for the construction of recycled PCC and AC test sections. The samples of concrete and asphalt mixes were collected during the construction. The results of tests performed on these samples are described in the report. Also, shortly after the construction of all test sections, 32 cores from rigid pavement test sections and 24 cores from flexible test sections were obtained. These samples were also tested in the laboratory to determine various characteristics of concrete and asphalt mixes. The results of these measurements are described in the report. Sixteen slabs out of a total of 216 slabs of recycled concrete mix developed transverse cracks at the mid-slab after about 2 months of their opening to traffic. Based on the results of this study it was concluded that the use of recycled PCC aggregates in concrete mix is a feasible alternative. However, the use of sand portion of recycled aggregates in concrete mix is not practical because this material has very high absorption compared to natural sand.

  • Corporate Authors:

    Resource International, Incorporated

    281 Enterprise Drive
    Westerville, OH  United States  43081

    Ohio Department of Transportation

    25 South Front Street
    Columbus, OH  United States  43215

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Saraf, C L
    • Majidzadeh, K
  • Publication Date: 1995-6

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 118 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00725543
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/OH-95/025, Final Report
  • Contract Numbers: State Job 14459(0)
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Sep 10 1996 12:00AM