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Ice Test by Hydro Quebec IREQ Institute

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2010 Tests

1300 lbs concrete

2 ice blocks

2/10 x 21 inch

Drag distance

6.5 ft / block

Effective Pressure

83,500 lbf/ ft2

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Trial 1 – 40-50°F

20 cycles

No damage

Small depression°

Trial 2 – 40-50°F

With sand

10 cycles

No damage

Small scratches°

Trial 3 – 5°F

20 cycles

No damage

Small depression°

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Special geomembrane formulation for cold weather

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UPPER BLUE DAM

•Country: United States (Colorado)

•Elevation at crest: 11,742 feet

•Latitude: 39°N

•Dam height: 72 feet

•Type of face: bituminious concrete

•Geocomposite installation completed 2007

•Surface of upstream face: 71,350 sq. feet

•Installation time: 2 months

•Construction of a new plinth: no

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Upper Blue face condition

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First, install tensioning profiles to hold geocomposite

against wind force

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Second, install thick geotextile cushioning layer over rough spots

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Third , install the top seal with geocomposite

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Fourth in rough areas install geogrid to bridge depressions of face.

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Fifth, install thick geotextile over the geogrid

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Sixth, install the PVC geocomposite

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Seven, weld geocomposite sheets (2.1 m wide) together

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Eight, install the top tensioning profile

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Membrane installed but not tensioned on left, on right after tensioning profile installed

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Ninth , install cap strip over tensioning profile

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Tenth, remove the asphalt to expose concrete plinth

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Eleventh, install perimeter seal with anchors

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Twelve, install geogrid

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Thirteen, install geonet drainage collection layer

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Fourteen, install sacrificial geocomposite

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Fifteen, install gcocomposite over plinth

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Sixteen, install battens with coverstrip in ice area

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Seventeen, core drain through asphalt

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Eigteen, install drain plates (4) over drain holes

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Last step, complete installation of batten strip perimeter seal

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Statistics on dams in cold weather with exposed PVC geomembranes

PVC geomembranes are elastic and conform to subgrade

PVC can be formulated for low temperatures

Ice does not adhere to PVC

At least 55+ cold weather installations worldwide

Oldest – 37 years 1980 (Italy)

Highest Latitude – 59.5° N (Mongolia)

Highest Altitude – 11,742 fasl (Colorado)

More than 3,700,000 sq. feet installed in cold climates

More than 700 years of service for exposed PVC geomembrane installations in cold climates

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The End

Gem dam, USA, 84 feet, 20072008 ASDSO National Rehabilitation Project of the Year

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De-icing system

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PVC geomembrane resist impact by Rip Rap

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NO damage to the PVC geomembrane under Rip Rap

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