Guide Specification for Grouted Post-Tensioning

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Guide Specification for Grouted Post-Tensioning

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Publisher: Post-Tensioning Institute/American Segmental Bridge Institute

Description

This document includes all aspects of materials, installation, stressing, and corrosion protection levels for grouted post-tensioning systems. Requirements for field personnel are also stated as the knowledge of all involved contributes to building durable structures. The aim is to have this new Specification adopted by most State Departments of Transportation (DOT), simplifying the approval process for the systems used in different areas of the country while allowing for local environmental conditions. Also designers will find this book useful in preparing the Project Specifications.

 

Document Details

Publication Year: 2017

Pages: 25.00

ISBN:

Categories: Post Tensioning

Table of Contents

1.0—Introduction

1.1—General description

1.2—Alternative post-tensioning scheme

1.3—Referenced standards and specifications

2.0—Definitions and abbreviations

2.1—Definitions

2.2—Abbreviations

3.0—Post-tensioning system (PTS) tendon protection levels (PL)

3.1—Protection Level 1A (PL1A)

3.2—Protection Level 1B (PL1B)

3.3—Protection Level 2 (PL2)

3.4—Protection Level 3 (PL3)

4.0—Material and performance requirements

4.1—General

4.2—Material standards

4.2.1—Strand

4.2.2—Bar

4.3—Component standards

4.3.1—General

4.3.2—Post-tensioning anchorages

4.3.3—Permanent grout caps

4.3.4—Bar couplers

4.3.5—Duct

4.3.5.1—Corrugated metal duct

4.3.5.2—Corrugated plastic duct

4.3.5.3—Smooth HDPE duct

4.3.6—Duct connections and fittings

4.3.7—Heat-shrink sleeves

4.3.8—Precast segmental duct couplers

4.3.9—External smooth HDPE duct connections

4.3.10—Rigid ducts and steel pipes

4.3.11—Connection tolerance between pipe and duct

4.3.12—Inlets, outlets, valves, and plugs

4.4—System approval testing

4.4.1—Post-tensioning anchorages

4.4.2—Grouting component assembly pressure test (PL-2 and PL-3 only) and system safety proof test (PL-1 only)

4.4.3—Duct testing

4.4.4—Corrugated plastic duct

4.4.5—System pressure tests

4.4.5.1—Corrugated plastic duct connections

4.4.5.2—Precast segmental duct couplers

4.4.5.3—Internal duct systems

4.4.5.4—External duct systems

4.5—New systems and materials

5.0—Installation drawings and stressing calculations

5.1—General

5.2—System drawings

5.3—Tendon drawings

5.3.1—Plans and elevations

5.3.2—Sections

5.3.3—Measurements

5.3.4—Tolerances

5.3.5—Stressing data

5.3.6—Material take-off

5.3.7—Temporary openings for PT work

5.3.8—Installation requirements

5.4—Stressing calculations

6.0—Quality assurance and quality control (QA/QC)

6.1—QA program

6.2—Procurement

6.3—Project quality plan

6.4—Receiving

6.4.1—Wedges

6.4.2—Prestressing steel

6.4.3—Anchorages

6.5—Identification and traceability of materials

6.6—Sampling of prestressing material

6.7—Defects during installation

7.0—Personnel qualifications

7.1—Supervision

8.0—Shipping and storage of materials

8.1—General

8.2—Anchorages

8.3—Wedges

8.4—Metal duct

8.5—Plastic duct

8.6—Strand

8.7—Bars

8.8—Cement and grout

8.9—Accessories

9.0—Bearing plate and duct installation

9.1—General

9.2—Measurements

9.3—Tolerances

9.4—Anchorage components

9.5—Deviation pipes

9.6—Ducts

9.7—Accessories

9.8—Splices and joints

9.9—Location of grout inlets and outlets

10.0—Placing concrete

10.1—Precautions

10.2—Proving of post-tensioning ducts

10.3—Problems and remedies

11.0—Prestressing steel installation

11.1—General

11.2—Strand

11.3—Bar

11.4—Corrosion protection

11.5—Acceptance criteria

12.0—Stressing operations

12.1—General

12.2—Maximum stress at jacking

12.3—Stressing sequences

12.4—Stressing jacks and gauges

12.5—Calibration of jacks and gauges

12.6—Elongations and agreement with forces

12.7—Friction testing

12.8—Wire failures in strand tendons

12.9—Cutting of post-tensioning steel

12.10—Capping of tendons

12.11—Record of stressing operations

13.0—Grouting operations

13.1—Duct air test

14.0—Protection of post-tensioning anchorages

14.1—General

14.2—Pourbacks

14.3—Elastomeric coating system

15.0—Repairs of holes and access openings

15.1—Openings

16.0—References

The purpose of this document is to establish a unified, nationally recognized specification for grouted post-tensioning. It is intended to apply to buildings, bridges, storage structures, and other structures using grouted post-tensioning tendons, except as follows: stay cables and rock anchors that are already covered by other PTI documents.

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