A Study on Eco Friendly use of Recycled Rubber Tyres

The 20-40mm particle size of crushed aggregate and rubber aggregate showed 100% passing but river sand showed zero%. The 10 mm particle size of river sand showed 100% passing. Hydraulic conductivity ranges from 0.5 cm/sec (0.2 inches/sec) for compressed 10–38 mm (0.4–1.5 inches) shreds to more than 20 cm/sec (8 inches/sec) for 25–64 mm (1– 2.5 inches) loose shred. Thermal conductivity varies from 0.0838 Cal/meter-hour-degree C (5.6X10E-5 Btu/ft-hr-degree F). Increasing the tire chip content in sand increase the initial friction angle, with values as high as 65 being obtained for dense sands and tire chip contents of 30% (by volume). Because of their lower specific gravity (1.15 to 1.21) relative to that of soil solids (2.55 to 2.75), tire chips, alone or in mixtures with soils, offer an excellent light-weight and strong fill material for use as backfill in earthen structures. The shear strength decreases as the tyre chip percentage increases beyond 30%. sandy silt– tyre chip mixtures showed an improvement in strength as the percentage of rubber increased (from 10% to 20%) . In comparing the minimum damping ratio at a shear strain of 5x 10-4 % increase damping with tire inclusion. The addition of fine aggregate rubber from 10% up to 40% rubber content maintained a linear decrease in slump values. Maximum compressive strength was obtained for 40% CRA and FRA at 7 and 28 days A significant initial plastic compression under load takes place. This was high as 40% of the initial placement thickness for pure tire chips. The constrained moduli for initial loading vary between 500 and 30,000 kPa.