00647248

Component

http://onlinepubs.trb.org...trr/1993/1422/1422-006.pdf

https://scholar.google.co...nion&publication_year=1993

Scrap tires that have been cut into chips are coarse grained, free draining, and have a low compacted density, thus offering significant advantages for use as lightweight fill and retaining wall backfill. The engineering properties needed to put tire chips into use are presented. The properties determined for tire chips, from three suppliers, are gradation, specific gravity, compacted density, shear strength, compressibility, and coefficient of lateral earth pressure at rest. The 76-mm (3-in.) maximum size and high compressibility of the tire chips necessitated design and fabrication of custom-made testing equipment. The tests showed that the tire chips are composed of uniformly graded, gravel-sized particles that absorb only a small amount of water. Their compacted density is 0.618 to 0.642 Mg/cu m (38.6 to 40.1 pcf), which is about one-third that of compacted soils. The shear strength was measured in a large-scale direct shear apparatus. The friction angle and cohesion intercept ranged from 19 to 25 degrees and 8 to 11 kPa (160 to 240 psf), respectively. The compressibility tests showed that tire chips are highly compressible on initial loading, but that the compressibility on subsequent unloading and reloading cycles is less. The horizontal stress was measured during these tests and showed that the coefficient of lateral earth pressure at rest varied from 0.26 for tire chips with a large amount of steel belt exposed at the cut edges to 0.47 for tire chips composed entirely of glass-belted tires.

This paper appears in Transportation Research Record No. 1422, Lightweight Artificial and Waste Materials for Embankments over Soft Soils. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01398732

English

p. 29-35

1993

Transportation Research Record

0309055695

Figures (6) ; References (14) ; Tables (3)

Aggregate gradation; Backfilling; Compressibility; Crumb rubber; Density; Earth pressure; Fills; Lightweight materials; Properties of materials; Shear strength; Solid wastes; Specific gravity; Testing equipment; Tires

Earth pressure at rest; Scrap tires; Tire chips

Bridges and other structures; Design; Geotechnology; Highways; Materials; Vehicles and Equipment; I24: Design of Bridges and Retaining Walls; I35: Miscellaneous Materials

TRIS, TRB

Apr 22 1994 12:00AM

• CYCLIC PLATE LOAD TESTS ON LIGHTWEIGHT AGGREGATE BEDS
• LIGHTWEIGHT AGGREGATE SOIL MECHANICS: PROPERTIES AND APPLICATIONS
• LIGHTWEIGHT FILL SOLUTIONS TO SETTLEMENT STABILITY PROBLEMS ON CHARTER OAK BRIDGE PROJECT, HARTFORD, CONNECTICUT
• LIGHTWEIGHT FOAMED CONCRETE FILL
• LONG-TERM PERFORMANCE OF WOOD FIBER FILLS
• RUBBER SOILS AS LIGHTWEIGHT GEOMATERIALS
• USE OF SHREDDED TIRES FOR LIGHTWEIGHT FILL
• USE OF WOOD FIBER AND GEOTEXTILE REINFORCEMENT TO BUILD EMBANKMENT ACROSS SOFT GROUND
• WEIGHT-CREDIT FOUNDATION CONSTRUCTION USING ARTIFICIAL FILLS (WITH DISCUSSION AND CLOSURE)