Tire Shred Backfill in Mechanically Stabilized Earth Wall Applications

摘要: Tire shred-soil mixture backfill for use in mechanically stabilized earth (MSE) walls has several advantages over traditional materials: 1) good drainage, 2) high shear strength, 3) low compacted unit weight and 4) lateral pressure exerted on retaining structures. This work presents the results of laboratory tests performed tire shred-sand mixtures focusing determining properties required their as MSE wall applications. Three sizes shreds are considered: chips with 9.5mm nominal size, 50-to-100-mm 100-to-200-mm length. The optimal mix proportions enhanced mechanical response composite material provided. Segregation materials was investigated various proportions. effects shred mixing ratio interaction between geogrids/ ribbed-metal strips evaluated based a series pullout tests. Results indicate that proportion sand is 25/75 30/70 (tire shred/sand) by weight, equivalent to approximately 40/60 50/50 volume 50-100 mm 100-200mm length, respectively. optimum also ensures negligible segregation components material. For all three shredded considered, capacity geogrid embedded prepared at larger than obtained pure shreds. placed samples found be higher chip-sand mixtures. mainly due crossing chips, which generates passive resistance during pullout. size effect ribbed-strip Large-scale direct strength (50 100 size)-sand ratios.