Abstract
Abstract Waste tyre-derived products, including whole tyres, tyre bales, shreds, chips and crumb rubber, have been widely used in geotechnical applications. In particular, tyre bales have considerable potential for use in the construction of a lightweight embankment or road foundation over soft ground, slope stabilisation or landslide repairs and the backfilling for retaining structures. Proper design of tyre bale structures requires a reliable strength analysis to ensure an adequate factor of safety. The analysis should utilise the properties of the tyre bales and the baled structures, which must be properly determined. A laboratory test programme was developed to determine the key strength parameters of a backfill made of tyre bales supplemented with a lightweight aggregate. Full-scale direct shear tests were conducted to define the interface shear strength between the tyre bales and the filling material. Earth pressure reduction analysis based on the experimental results was performed as well to assess the effectiveness of waste tyre bales used as a backfill for rigid retaining structures.
Highlights
Waste tyre-derived products (TDP), including whole tyres, tyre bales, shreds, chips and crumb rubber, have been widely used in geotechnical applications
Earth pressure reduction analysis based on the experimental results was performed as well to assess the effectiveness of waste tyre bales used as a backfill for rigid retaining structures
To assess the effectiveness of waste tyre bales used as a backfill for rigid retaining structures, earth pressure reduction analysis based on the experimental results was performed
Summary
Waste tyre-derived products (TDP), including whole tyres, tyre bales, shreds, chips and crumb rubber, have been widely used in geotechnical applications. One of the potential applications of waste tyre bales is their use as a backfill for rigid retaining structures and bridge abutments (typically made of concrete). The lightweight backfill consisting of waste tyre bales, supplemented with lightweight aggregate, considerably reduces the earth pressure on the retaining wall, allowing for a more economical construction by designing a lighter (thinner) wall with less reinforcing. Additional structural profit can be obtained when the application of the tyre baled backfill for integral bridges is considered. No known application of the waste tyre bales in retaining wall / bridge abutment backfill has been reported to date, the concept has been widely discussed (Winter et al [26], Zornberg et al [30]). A domestic laboratory testing programme was prepared to determine the basic mechanical properties required for the design of retaining structures with tyre bales.
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