Strength and deformation characteristics of shredded rubber tire - sand mixtures

The volume of scrap tires, an undesired urban waste, is increasing every year. One of the possible alterna- tives for this waste is to use shredded tires alone or mixed with soil as a lightweight backfill. This paper presents the results of triaxial tests on compacted shredded rubber tire - sand mixtures. The tests were carried out with different mixing ratios of shredded rubber tires and sand. With an increasing proportion of sand in the mixture, the density, unit weight, and shear strength of the mixture increased, but the compressibility decreased. The dilatancy characteristics of shredded rubber tires mixed sand were relatively similar to a cohesionless material and can be explained within a criti- cal state framework. A proposed constitutive model broadly captures the strength and deformation characteristics of a shredded rubber tire - sand mixture at different mixing ratios. Resume : Les pneus de rebut constituent un residu urbain indesirable dont le volume s'accroit chaque annee. Un des usages possibles de ce residu est l'utilisation des pneus dechiquetes seuls ou melanges avec le sol comme remblai le- ger. Cet article presente les resultats d'essais triaxiaux sur les pneus de caoutchouc dechiquetes melanges ou non avec du sable. Les essais ont ete realises avec differents rapports de melange de pneus de caoutchouc dechiquetes et de sable. Avec une portion croissante de sable dans le melange, la densite et le poids volumique du melange ont aug- mente, mais la compressibilite a diminue et la resistance au cisaillement a augmente. Les caracteristiques de dilatance des pneus de caoutchouc avec un melange de sable ont ete relativement similaires a un materiau pulverulent et peuvent etre expliquees dans le cadre d'un etat critique. Un modele constitutif tel que propose peut englober en gros les carac- teristiques de resistance et de deformation d'un melange de pneus de caoutchouc dechiquetes et de sable a divers rap- ports de melange. Mots cles : pneus de caoutchouc dechiquetes, essai triaxial, modele constitutif. (Traduit par la Redaction) Youwai and Bergado 264

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