geo foams in geo technical applications
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GEO FOAMS
Submitted By T. Saidulu
135T1A0146
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INTRODUCTION As per ASTM D 4439, the Geofoam can be defined as
block or planar rigid cellular foamed polymeric used in geotechnical engineering applications.
In textile term, the geofoam is called as Expended Polystyrene (EPS) or Extruded Polystyrene (XPS).
The geofoam is a cellular plastic material. We say it a thermocal used for packaging the electronic goods, making cup container to drink coffee or tea and others.
The geofoam is a super light material which is available in the form of blocks or cellular honeycomb form. It provides easy of handling. It is an emerging geomaterial
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Size of block-molded geofoam is about 600 mm x 1200 mm x 2400 mm. The block size can vary from country to country. The other minimized sizes can be made by cutting and trimming at site.
Weight of the block varies from 11 kg/m3 to 40 kg/m3. Its density is very less (about 100 times less) compared to the conventional fill materials in geotechnical engineering.
Geofoams have been used in many structures around the world for the last forty-five years.
The life time of geofoam is about 70 to 100 years.
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GEOSYNTHETICS FOR GEOFOAM STRUCTURES
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GEOFOAM RETAINING WALL
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FULL SIZE EPS BLOCK IN TEMPORARY STORAGE AFTER MOULDING
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GEOFOAM MANUFACTURING PROCESS
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APPLICATIONS
Geofoam can effectively be used in various engineering applications,
Embankment and Pavements, Tunnels and buried pipesRetaining walls and abutments, TunnelsRoad widening, Clay Liners Railways, Flood Control LeveesFoundationParkingSide-hill fill, Clay Heave ProtectionLandscape Sound barriersDike/ Berms Landfills, andBelow ground walls of structures Gas Venting
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GEOFOAM AS AN ALTERNATIVE BACKFILL MATERIAL BEHIND RETAINING WALL
In conventional method, good quality granular materials are used as backfill behind retaining structures. Sometimes the materials are scarce.The inclusion of geofoam reduces the lateral earth pressure dramatically.
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GEOFOAM AS AN ALTERNATIVE FILLING MATERIAL FOR EMBANKMENT
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PLACEMENT OF GEOFOAM AS BACKFILL MATERIAL BEHIND REINFORCED CONCRETE RETAINING WALL
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PLACEMENT OF GEOFOAM AS DRAINAGE BEHIND REINFORCED CONCRETE RETAINING WALL
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GEOFOAM AS COMPRESSIBLE INCLUSION WITH REINFORCEMENTS BEHIND REINFORCED CONCRETE RETAINING WALL
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Application of Geofoam behind bridgeabutment (after Stark et al., 2004)
Geofoam application in retaining wall forextension of existing pavement
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Geofoam as filling material beneath the pavement
Embankment made of geofoam as filling material
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Geofoam beneath the slabs or beams atfoundation (After Frydenlund et al., 1987)
Slope side fills of geofoam
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Geofoam application in hilly terrain
Different density geofoam used for road construction
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Geofoam beneath the bridge abutment (After Frydenlund and Aabфe, 1996
Geofoam above canal
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Geofoam as compressible inclusionbeneath a grade beam or structural slab
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Bridge Ramp Construction With Geofoam
Geofoam – Check After 25 Years In ServiceNo deformationNo damage