Optimization of Aspect Ratio of Waste Tire Shreds in Sand-Shred Mixtures Using CBR Tests

Waste tires have applications in civil engineering, for example, they are used for reinforcing soft soil in road construction. Notwithstanding environmental hazards, susceptibility to ignition, and suitability for shelters for animals and insects, it is still crucial to find feasible, technical, economical, and environmentally sound applications for waste tires in the form of whole, shreds, or chips. The intent of this article is to assess the advantage of optimizing aspect ratio (length to width) of waste tire shreds on California Bearing Ratio (CBR) of sand-tire shred mixtures. The mixtures were composed of a relatively uniform sand and tire shreds with 2-, 3-, and 4-cm widths and various lengths. Shred contents of 15, 30, and 50% by volume were mixed with sand at two sand matrix unit weights of 15.5 kN/cu m and 16.8 kN/cu m. Results indicate that the influencing parameters on CBR of the mixtures are sand matrix unit weight, shred content, shred width, and aspect ratios of tire shreds. The variation of aspect ratios can increase CBR up to 850%. The average value for the influence of the shred aspect ratio on CBR was about 161%. For a given shred width, there is only a certain length giving the greatest CBR for sand-tire shred mixtures, regardless of shred contents and compaction effort. Though the results as presented herein are encouraging, economical evaluation for making shreds generally and optimizing their dimensions specifically together with more environmental assessment requires further investigation.

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  • Authors:
    • Ghazavi, Mahmoud
    • Sakhi, Masoud Amel
  • Publication Date: 2005-11


  • English

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  • Accession Number: 01007277
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 11 2005 8:59AM