doi:10.3850/GI193

ABSTRACT

This paper deals the pullout and large scale direct shear test of tire chips-sand mixture reinforced with geogrid. Saint-Gobain (geogrid A) and Polyfelt (geogrid B) were selected as reinforcing materials. Tire chips-sand mixtures with mixing ratios of 0:100, 30:70, 40:60, and 50:50 by weight were used as fill materials. Numerous experiments including index tests, compaction tests, pullout tests, and large-scale direct shear tests were conducted. The index properties of the backfill materials, the shear strength parameters, the maximum pullout shear stresses and maximum direct shear stress of backfill and reinforcement are also reported. The test results revealed that the dry unit weight of tire chip-sand mixtures depended more on the sand content, and less on the water content. The mixture at the mixing ratio of 30:70 by weight or 50:50 by volume was found to be the most suitable fill material compared to other mixing ratios. The pullout test results shown that failure modes of geogrid reinforcements were slippage failure at the normal stresses of 30 and 60 kPa and tensile failure at the high normal stresses of 90 and 120 kPa. The direct shear resistance of tire chips-sand mixtures with and without geogrid depended on the sand content in the tire chips-sand mixtures which increased with the increasing sand content.

Keywords: Interaction; geogrid; tire chips-sand mixture.

© 2010 by Geotechnical Society of Singapore (GeoSS)