Post on 28-Mar-2018
Grouted Post-Tensioning: Protection Levels
Presented by: Jacob Myer2013 PTI Convention: Scottsdale, AZ
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History of Protection Levels
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Protection Level Categories
Levels 1A, 1B, 2,3Tensile Elements
Duct TypeDuct Connection Requirements
GroutEmbedment Coating
Anchorage CapEncapsulation Type
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Protection Level 1 : Tensile Elements
Unless the project requires otherwise main tensile elements must conform to the following:
Strand must conform to ASTM A416, Grade 270, low‐relaxation, seven‐wire strand.
High Strength Bar must conform to ASTM A722, Grade 150
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Protection Level 1: Duct
Duct for PL1 can consist of of the following:Galvanized Duct
Seamless Plastic DuctSmooth HDPE Pipe
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Galvanized Spiral Duct
Fabricated of galvanized sheet conforming to ASTM A653/A653M, coating designation G90
26 Ga for Duct up to 2.625” Dia24 Ga for Duct over 2.625” Dia
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Plastic Duct
Seamless Corrugated Plastic DuctFabricated from virgin, unfilled, non‐colored
polypropylene or polyethylene.
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Smooth HDPE Pipe• SDR 17• 100 psi Working Pressure• 100% Virgin HDPE with 40 min OIT
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Protection Level 1A: Grout
Basic grout Type B per PTI’s “Specification for Grouting of Post‐Tensioned Structures”;
Engineered grout Type A per PTI’s “Specification for Grouting of Post‐Tensioned Structures”;
Grout filling procedure to leave no voids in duct.
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Protection Level 1: Embedment Coating
No Special Coating Requirements
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Protection Level 1: Anchorage CapNo Permanent Cap Requirement
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Protection Level 1: Duct Connections
• Must Be Concrete Paste Tight• Smooth Interior Alignment• Capable Of Withstanding 10ft
Concrete Fluid Pressure• Mechanical Couplers, Plastic Sleeves,
Or Heat Shrink Are Typically Used
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Protection Level 2
(Picture of PL2 system)
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Protection Level 2: DuctDuct must provide for a air/water tight envelope around
the tensile element .Duct for PL2 can consist of of the following:
Seamless Plastic DuctSmooth HDPE Pipe
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Protection Level 2: Grout
Engineered grout Type A per PTI’s “Specification for Grouting of Post‐Tensioned Structures”
Thixotropic in nature
Grout filling procedure to leave no voids in duct.
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Protection Level 2: Embedment CoatingEmbedded Components must be Galvanized or
Epoxy Coated
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Protection Level 2: Anchorage Cap• Approved Materials:Stainless 316 ASTM A240,
nylon, acrylonitrile butadiene styrene (ABS), or polyester• Must hold 150psi working pressure
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Protection Level 2: Duct Connections
• Must Create Air and Water Tight Seal• Smooth Interior Alignment
• Capable Of Withstanding 10ft Concrete Fluid Pressure• Tape Seals not allowed
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Protection Level 3
• Air Tight System equal to PL2• Includes Electric Isolation of Tensile elements
• Allows PT system to be monitorable and inspectable
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FIB Testing Plastic Duct Performance Spec
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Dimensional Test
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Flexural Behavior Test
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Flexibility of Duct
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Lateral Load Resistance of Duct
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Longitudinal Load Resistance
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Leak Tightness Of Duct
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Wear Resistance Of Duct
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Bond Behavior of Tendon
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Area’s for Improvement
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Any Questions?