pda europe 2010 annual conference – it’s time to… polyurea – sitges, 15-17 november polyurea...
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PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Polyurea Dam Repair
A Case Study of the Girotte Dam in France
By Murphy Mahaffey
Director International Sales
WIWA Wilhelm Wagner GmbH & Co. KG
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Overview
• History of the Girotte Dam• Design• Project Requirements• Application• Performance to Date• Contributors to the Project
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
History of the Girotte Dam
• Located in the Rhone-Alpes Region near Hauteluce
• Girotte Lake producing electricity since 1903
• Built from 1942-1949• First Sub-Glacial inlet
structure in the world
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Construction of Girotte Dam
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Girotte Dam Design• Multiple Arch and Buttress
Design– 18 Arches held by Fixed
Buttresses• Unreinforced Concrete
– Due to Shortage of Steel• 45 m / 148 Feet Tall• 510 m / 1,675 feet long• Spans a mountain ridge
– 1,747m /5,732 feet elevation
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Girotte Dam Design
• Reservoir Surface Area is 75 ha / 8.7 million square feet
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Girotte Dam Conditions• Difficult Weather Conditions
– Cycling Temperatures and Elevation are demanding on a Concrete Structure, morning temperatures on job were 10C / 50F
– Aggressive Glacial Waters from Tré-la-Tête Glacier
– Wind Erosion• Elevation 1,747m / 5,732 feet• Aggressive Glacial Water• Multiple Coatings over time- paint, resin, etc.
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Girotte Condition Report 2006
Condition Report in March 2006
- Cracks observed in wall
- Escapes at some membranes (leaks)
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Polyurea Material Specification and Budgeting
Polyurea offered these advantages over other competing systems:
• Fast setting• Sprayable• High-Build• Ease of Application• Exceptional Life
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Safety Considerations• Difficult Access• Harness Work• Changing Weather Conditions
– Temperature, Wind• Elevation• Communication with Sprayer• Environmentally Sensitive Area• Equipment Operation• Material Handling
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Polyurea Application
• Visual Inspection– Individual drops by
rope and harness over all 18 arches and buttress
– Top of Dam to Base
– Safety is a Priority
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Polyurea Application
• Identify and Mark Cracks
• Grind Cracks Down
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Polyurea Application
• Apply 2-Component Epoxy Primer
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Polyurea Application
Equipment Requirements
• 110 Bar / 1,600 psi spray pressure
• 70C / 160F material temperature
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Polyurea ApplicationEquipment
Requirements• Full access to
Wall Base 45m• Heated Hose• High Delta T
Heaters• Impingement
Mixing Spray Gun
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Polyurea ApplicationEquipment
Safety Requirements
• Over Pressure Shutdown
• Over Temperature Shutdown
• Ratio Monitoring
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Polyurea Application
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Polyurea Job Details
• 1,200 Kilos / 2,645 lbs. of Polyurea Sprayed– 110Bar / 1,600 psi;
70C / 160F• Applied over 5 Days
– Changing Weather Conditions
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Performance to Date
System Performing Within Specification
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Polyurea Dam Repair Success
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Contributing CompaniesSPIE Batignolles- Application
BMS- Equipment Supplier
Tradecc- Polyurea Material
WIWA- Equipment Design and
Technical Support
WIWA France- Laksander Michel
PDA Europe 2010 Annual Conference – It’s Time to… Polyurea – Sitges, 15-17 November
Thank You!
Polyurea Dam Repair
A Case Study of the Girotte Dam in France
By Murphy Mahaffey
Director International Sales
WIWA Wilhelm Wagner GmbH & Co. KG