Optimization of Aspect Ratio of Waste Tire Shreds in Sand-Shred Mixtures Using CBR Tests
Ghazavi, M
Currently: Civil Engineering Department, K. N. Toosi University of Technology, Tehran, Iran, Formerly: Civil Engineering Department, Isfahan University of Technology, Isfahan, Iran

Sakhi, MA
Civil Engineering Department, Isfahan University of Technology, Isfahan, Iran

(Received 31 July 2003; accepted 8 April 2005)

Abstract
The advantage of optimizing aspect ratio (length to width) of waste tire shreds on California Bearing Ratio (CBR) of sand-tire shred mixtures is investigated in this paper. 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/m³ and 16.8 kN/m³. The results show 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. This is the main objective sought in this paper.

Keywords:
California bearing ratio, compaction, sand, tire shreds, waste tire

Paper ID: GTJ12126
DOI: 10.1520/GTJ12126

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Author Ghazavi, M Affiliation Currently: Civil Engineering Department, K. N. Toosi University of Technology, Tehran, Iran, Formerly: Civil Engineering Department, Isfahan University of Technology, Isfahan, Iran Author Sakhi, MA Affiliation Civil Engineering Department, Isfahan University of Technology, Isfahan, Iran Author Ghazavi M, Sakhi MA Title Optimization of Aspect Ratio of Waste Tire Shreds in Sand-Shred Mixtures Using CBR Tests Symposium , Committee on