Grouted Post-Tensioning: Protection Levels Convention/2013... · Strand must conform to ASTM A416,...
-
Upload
truongkhanh -
Category
Documents
-
view
224 -
download
1
Transcript of Grouted Post-Tensioning: Protection Levels Convention/2013... · Strand must conform to ASTM A416,...
Grouted Post-Tensioning: Protection Levels
Presented by: Jacob Myer2013 PTI Convention: Scottsdale, AZ
Title Text
History of Protection Levels
Title Text
Protection Level Categories
Levels 1A, 1B, 2,3Tensile Elements
Duct TypeDuct Connection Requirements
GroutEmbedment Coating
Anchorage CapEncapsulation Type
Title Text
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
Title Text
Protection Level 1: Duct
Duct for PL1 can consist of of the following:Galvanized Duct
Seamless Plastic DuctSmooth HDPE Pipe
Title Text
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
Title Text
Plastic Duct
Seamless Corrugated Plastic DuctFabricated from virgin, unfilled, non‐colored
polypropylene or polyethylene.
Title Text
Smooth HDPE Pipe• SDR 17• 100 psi Working Pressure• 100% Virgin HDPE with 40 min OIT
Title Text
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.
Title Text
Protection Level 1: Embedment Coating
No Special Coating Requirements
Title Text
Protection Level 1: Anchorage CapNo Permanent Cap Requirement
Title Text
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
Title Text
Protection Level 2
(Picture of PL2 system)
Title Text
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
Title Text
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.
Title Text
Protection Level 2: Embedment CoatingEmbedded Components must be Galvanized or
Epoxy Coated
Title Text
Protection Level 2: Anchorage Cap• Approved Materials:Stainless 316 ASTM A240,
nylon, acrylonitrile butadiene styrene (ABS), or polyester• Must hold 150psi working pressure
Title Text
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
Title Text
Protection Level 3
• Air Tight System equal to PL2• Includes Electric Isolation of Tensile elements
• Allows PT system to be monitorable and inspectable
Title Text
FIB Testing Plastic Duct Performance Spec
Title Text
Dimensional Test
Title Text
Flexural Behavior Test
Title Text
Flexibility of Duct
Title Text
Lateral Load Resistance of Duct
Title Text
Longitudinal Load Resistance
Title Text
Leak Tightness Of Duct
Title Text
Wear Resistance Of Duct
Title Text
Bond Behavior of Tendon
Title Text
Area’s for Improvement
Title Text
Any Questions?