AN INVESTIGATION INTO THE GEOTECHNICAL PROPERTIES OF SOIL-TYRE MIXTURES

The work presented in this paper investigates the potential of using w aste shredded tyre in soil-tyre mixtures for specific engineering appl ications. Bentonite, kaolin and kaolin-lime were used as the base clay ey soil types. Soil-tyre mixtures containing up to 20% tyre were teste d for compaction, unconfined compression strength, permeability and le achability. The results show that the compacted dry density, strength and permeability decrease with the introduction of the tyre and decrea se further as the amount and size of tyre particle is increased. The p ermeability results, which contradict other published work, could mean possible application as landfill cover and landfill liner material. T he TCLP leaching test indicated higher concentrations of heavy metals in the leachates than drinking water standards with the exception of o ne of the kaolin-lime-tyre mixtures. Results from less severe lead-rin g tests than the TCLP test should be investigated before firm conclusi ons are made. These results are encouraging for use of waste shredded Lyre in soil-tyre mixtures. It could prove to be both economical and a safe method of the disposing of rubber.