Table of Contents
TABLE OF CONTENTS
1. INTRODUCTION TO POST-TENSIONING
1.1 Objectives
1.2 Section Goals
1.3 Theory of Prestressed Concrete
1.4 Benefits of Post-Tensioning
1.5 Types of Post-Tensioning Systems
1.6 Grouted Post-tensioning Applications
2. POST-TENSIONING SYSTEM MATERIALS AND COMPONENTS
2.1 Objectives
2.2 Section Goals
2.3 Responsibilities
2.4 Post-Tensioning Systems
2.5 Components
2.6 Storage and Handling
2.7 Traceability of Components
2.8 Definitions
3. MATERIAL PROPERTIES AND TESTING
3.1 Objectives
3.2 Section Goals
3.3 Terminology
3.4 Post-Tensioning System Qualification
3.5 Prestressing Steel
3.6 Sampling and Approval of Components
3.7 Testing by the Contractor
4. INSTALLATION
4.1 Objectives
4.2 Section Goals
4.3 Tools and Equipment
4.4 Installation of Duct Assemblies
4.5 Installation of Prefabricated Tendons
4.6 Splices and Connections
4.7 Location and Assembly of Inlets and Outlets
4.8 Mandrels
4.9 Protection of Ducts during Concrete Placement
4.10 Installation of Anchorage Assemblies
4.11 Checking for Leaks and Blockages
4.12 Installation of Pre-Stressing Strands
4.13 Installation of Pre-Stressing Bars
4.14 Protection of Prestressing Steel
4.15 Installation of the Anchor Heads and Wedges
4.16 Protection of Ducts after Concrete Placement
5. TENDON STRESSING OPERATIONS
5.1 Objectives
5.2 Section Goals
5.3 Principals of the Hydraulic Jack
5.4 Determining Stressing Forces
5.5 Stressing Equipment
5.6 Assembly & Operation of Stressing Equipment
5.7 Preparation for Stressing
5.8 Stressing of Tendons
5.9 Finishing of Tendons
5.10 Lift-Off
6. GROUTING
6.1 Objectives
6.2 Section Goals
6.3 Tools and Equipment
6.4 Written Grouting Procedures
6.5 Checking for Blockage Prior to Grouting
6.6 Mixing Procedures
6.7 Pumping Procedures
6.8 Grouting of Vertical Tendons
6.9 Post Grouting Procedures
6.10 Incomplete Grouting
6.11 Grouting Records
7. CORROSION PROTECTION OF TENDONS
7.1 Objectives
7.2 Section Goals
7.3 Corrosion Protection Strategies
7.4 Corrosion Protection at Anchorages
7.5 Duct
7.6 Temporary Corrosion Protection
8. CONSTRUCTION DOCUMENTS
8.1 Objectives
8.2 Section Goals
8.3 Construction Documents
8.4 Project Specifications
8.5 Structural Drawings
8.6 Approved Post-Tensioning Installation Drawings
8.7 Rebar Shop Drawings
8.8 Tendon Fabrication Sheets and Other Shipping Documents
8.9 Material Certifications
8.10 Stressing Equipment Calibrations
8.11 Stressing Records
8.12 Grouting Records
9. SAFETY
9.1 Objectives
9.2 Section Goals
9.3 Safety Considerations
9.4 Safety Coordination
10. TROUBLE SHOOTING
10.1 Objectives
10.2 Section Goals
10.3 Problems that Occur During Installation of Prestressing Steel
10.4 Honeycombing and improper concrete Consolidation
10.5 Problems that Occur During Stressing Operations
10.6 Problems that Occur During Grouting Operations
11. REFERENCES
APPENDIX A – SAMPLE ELONGATION CALCULATIONS
APPENDIX B – SAMPLE STRESSING RECORD
APPENDIX C – SAMPLE GROUTING RECORD