Bulkhead Design Using Recycled Materials as Backfill
Publication: Ports 2007: 30 Years of Sharing Ideas: 1977-2007
Abstract
This paper will present a conceptual analysis of a bulkhead design that instead of using conventional fill, stone or dredged sands, uses an alternative layered system based on re-used materials. The layered system is comprised of Tire Derived Aggregate (TDA; ASTM D6270) encapsulated by soil layers made from blends of curbside-collected, 9.5 mm (3/8")-minus crushed glass (CG) and dredged material (DM) fines, or CG-DM blends. TDA is a freely draining lightweight geotechnical fill (7.8 kN/m3 (~50 lbs/ft3) which has been used in numerous civil engineering applications to improve slope stability, reduce surcharge pressures on soft compressible soils, and lower earth pressures on retaining walls. Pug-milled CG-DM blends can be prepared to meet DOT embankment and structural fill specifications while also enabling immediate fill construction by improving the workability, strength, drainage and settlement characteristics of DM fines without the need for curing or consolidation. Both materials have interesting geotechnical properties, and their application to maritime construction has the potential to revolutionize bulkhead design and construction while bolstering the efficiency of recycling programs. This paper compares the design of bulkheads with conventional backfills, versus a bulkhead leveraging recycled materials. The results clearly illustrate that recycled backfills introduce significant economical and technical advantages, such as simplified construction sequencing, improved backfill properties and reduction of backfill weight.
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Copyright
© 2007 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Backfills
- Bulkheads
- Coastal protection structures
- Construction engineering
- Construction materials
- Construction methods
- Dredged materials
- Engineering materials (by type)
- Excavation
- Geomechanics
- Geotechnical engineering
- Layered soils
- Material mechanics
- Material properties
- Materials engineering
- Recycling
- Retaining structures
- River engineering
- Sediment
- Soil mechanics
- Soils (by type)
- Structural engineering
- Structures (by type)
- Water and water resources
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