A coordinated laboratory and field study was undertaken to assess the suitability of producing an economically suitable pavement base course material by reinforcing cement-stabilized recycled concrete aggregate with strips of reclaimed plastic or tire wires and tire chunks from recycled scrap tires. The field program included constructing 12 test sections using different proportions of various waste materials. It was found that the addition of fibers exerted no measurable effect on field compaction, but the in-place mixing technique used was unsuccessful in distributing the fibers homogeneously throughout the full depth of the slab. Laboratory split tensile tests and beam flexural tests showed that reinforced specimens exhibited lower tensile and flexural strengths and no improvement in toughness compared with unreinforced specimens. The same basic recycled aggregate mix, when reinforced with a commercially available hooked-end steel fiber, showed that 28-day specimens with 4% fiber reinforcement exhibited a pseudo strain hardening behavior after the peak, accompanied by a modest increase in tensile strength and almost doubling in toughness. Notwithstanding the generally recognized benefits to be realized in a pavement system by an increase in toughness in one or more layers, the results of this study suggest that caution and careful investigation should be exercised when contemplating the incorporation of waste products in the component layers. Failure to do so may result in false economy whereby initial cost is reduced somewhat at the expense of increased life-cycle costs because the anticipated performance was not achieved.


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 97-106
  • Monograph Title: Environmental testing and evaluation of stabilized wastes, performance of stabilized materials, and new aggregate tests
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00713592
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Nov 22 1995 12:00AM