GEOFOAM AND GEOMEMBRANES - University of Utahbartlett/Geofoam/Presentation... · 2018-11-16 · •...
Transcript of GEOFOAM AND GEOMEMBRANES - University of Utahbartlett/Geofoam/Presentation... · 2018-11-16 · •...
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Fabricated Geomembranes for EPS Geofoam Applications
Steven F. Bartlett, Ph.D., P.E.
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What is EPS Geofoam?What is EPS Geofoam?
• Expanded Polystyrene
• Light-weight cellar plastic (commonly called stryofoam)
• Molded in blocks used for construction purposes
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Geofoam ManufacturingGeofoam Manufacturing
Courtesy of EPSFoamPro.comCourtesy of EPSFoamPro.com
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Block Molding of EPS
Courtesy of Tri State Foam
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EPS PropertiesEPS Properties
Courtesy EPS Alliance
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EPS Embankment
UTA Light Rail – Salt Lake City, Utah
SR 519 Project – Seattle, Washington
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Common Uses of EPS GeofoamCommon Uses of EPS Geofoam
• Reduce settlement to protect buried utilities and adjacent structures on soft ground
• Improve stability and bearing capacity of embankments,embankments,
• Improve stability landslides and cut slopes
• Rapid construction in time critical areas
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Settlement Reduction andBuried UtilitiesBuried Utilities
B i d Pi liBuried Pipeline
NEW FILL
Buried Pipeline
NEW FILL
Buried Pipeline
Ruptured Pipeline
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Settlement Reduction andBuried Utilities
BuriedUtilitiesUtilities
Geofoam Embankment from State St. to 200 W. Interstate I-80, Salt Lake City, Utah
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Improving Bearing Capacity and Stability
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Improve Bearing Capacity and Stability
Reinforced SlopeS il N ilSoil Nails,Soil Anchors,or OtherReinforcementReinforcement
Cut slope orCut slope orlandslide
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Rapid Construction(Comparison of Construction Time)35
25
30 ConventionalGeofoam
(Wee
ks)
20
25
on T
ime
10
15
nstr
uctio
0
5Co
0Preparation Settlement Total
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Design Considerations
• Type • Moisture AbsorptionType• Dimensions• Density
C i St th
Moisture Absorption• Buoyancy• Thermal Resistance
Diff ti l I i• Compressive Strength• Allowable Load & Creep• Interface Friction
• Differential Icing• Chemical Attack• Flammability
• Stability of Internal Slope• Bedding Material & Compaction• Concentrated Loads
• Insect Infestation• Ultra Violet • DegradationConcentrated Loads Degradation• Durability
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Design Considerations(Prevention of Chemical Attack)(Prevention of Chemical Attack)
S l t th t Di l G f• Solvents that Dissolve Geofoam• Gasoline• DieselDiesel• Other Petroleum Based Fuels• Organic Fluids
• Protection Against Accidental Spills• Concrete Load Distribution Slab• Concrete Load Distribution Slab• Geomembrane• Fascia Panel Wall with Coping
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Prevention of Chemical AttackPrevention of Chemical Attack
EPS geofoam can be damaged hen e posed toEPS geofoam can be damaged when exposed to certain hydrocarbon chemical and may need protectionprotection.
Geomembranes compatible with EPS:
• polypropylene• polyethylene• polyethylene• chlorosulphonated polythylene (CSPE)• ethylene interpolymer alloys (EIAs)y p y y ( )
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Prevention of Chemical Attack
Rural Highway in Minnesota, Courtesy of MNDOT
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Prevention of Chemical Attack
Protection of side slope, UTA Frontrunner, Corner Canyon
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Chemical Attack - Protective BarriersI 15 DesignI-15 Design
Concrete Pavement (35 cm)
Load Distribution Slab(15 cm - Reinforced)
GeomembranePetroleum ResistantPetroleum Resistant(3 component)for exposed side slopeonlyonly
Tilt-up Panel Wall
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Chemical Attack - Protective BarriersI-15 Design
• Tripolymer Geomembrane
• Polyvinyl ChloridePolyvinyl Chloride• Ethylene Interpolymer Alloy• Polyurethane
• 9 mm thickness minimum (total)
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Chemical Attack – Protective BarriersSt D i d UtilitiStorm Drains and Utilities
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Geofoam Handbook
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QuestionsQuestions