DC10.3-20: Design, Construction, and Maintenance of Post-Tensioned Concrete Courts

This publication presents design and construction recommendations for post-tensioned concrete courts. This book is intended for designers, contractors, inspectors, and building officials. The book also covers common maintenance, construction, and detailing issues. Chapter highlights include general considerations, design requirements, detailing considerations, construction practices, sample specification provisions, elongation, final effective force, and conversion factor tables.

New items in this update include:

• Update of provisions to 2020 quality construction standards

• Enhanced details around posts and embedments

• Additional discussion of construction documents

• Acceptance, delivery, handling, and storage recommendations for PT materials

• Additional discussion of concrete materials, placement, and finishing

• Jobsite troubleshooting guidance on causes of improper elongation, handling of problems that can occur during stressing, safety considerations, handling and prevention of stressing, strand slippage, and prevention of other common issues

• Inspection items before, during, and after stressing tendons

• Added discussion of maintenance, landscaping, and adequate drainage for PT concrete courts

TABLE OF CONTENTS

1 — INTRODUCTION

1.1 — Purpose and scope

1.2 — Fabrication of tendons

1.3 — Responsibilities

1.4 — Definitions

2 — DESIGN RECOMMENDATIONS

2.1 — General

2.2 — Design requirements

2.3 — Final effective force per tendon

2.4 — Slab/subgrade friction

2.5 — Calculating required tendon spacing

2.5.1 Sample Tendon Spacing Calculation

2.6 — Designing Based on Equivalent Flexural Capacity

2.7—Detailing considerations

3 — DOCUMENT CONTROL

3.1 — General

3.2 — LDP’s slab construction documents

3.3 — Shipping documents

3.4 — Material certifications

3.5 — Stressing equipment calibration

3.6 — Stressing records

3.7 — Concrete placement records

4 — ACCEPTANCE, DELIVERY, HANDLING, AND STORAGE

4.1 — Acceptance and delivery

4.2 — Handling and storage

5 — SITE PREPARATION

5.1 — Subgrade preparation

5.2 — Slope and drainage

5.3 — Forming and construction joints

5.4 — Construction sequencing

6 — CONSTRUCTION

6.1—Field placement drawing requirements

6.2—General installation procedure

6.3—Tendon layout

7 — ENCAPSULATED SYSTEM

8 — CONCRETE

8.1 — Materials

8.2 — Placement

8.3 — Finishing

8.4 — Restraint cracks

9 — TENDON STRESSING

9.1 — General

9.2 — Preparation for stressing

9.3 — Stressing the tendons

9.4 — Causes of improper elongation

9.4.1 Equipment

9.4.2 Installation/concrete placement/stressing operations

9.4.3 Design/material discrepancies

9.5 — Problems that can occur during stressing

9.6 — Safety considerations

9.7 — Don’ts of stressing

9.8 — Inspection before, during, and after stressing tendons

10 — ELONGATION MEASUREMENTS

10.1 — General

10.2 — Preparation

10.3 — Measurement

10.4 — Recording

11 — TENDON FINISHING

11.1 — General

11.2 — Requirements for cutting of tendon tails

11.3 — Patching of stressing pockets

12 — JOBSITE TROUBLESHOOTING

12.1 — General

12.2 — Preventing the most frequent problems

12.3 — Strand slippage and/or stressing jack hung up

12.4 — Honeycombs in concrete

12.5 — Tendon and concrete blowouts

12.6 — Tendon rupture

12.7 — Tendons too short to be stressed using normal stressing procedures

12.8 — Splicing tendons

12.9 — Cracked wedges

12.10 — Lift off procedures

12.11 — Troubleshooting stressing equipment

12.11.1 — Jack is leaking

12.11.2 — Jack damages strand or will not grip strand

12.11.3 — Excessive seating loss (in excess of 3/8 in. [10 mm])

12.11.4 —Pump will not reach required gauge reading

12.11.5 — Pump is operating too slowly

12.11.6 — Gauges

13 — PROJECT MAINTENANCE

14 — LANDSCAPING

15 — SUMMARY

15.1 — General

15.2 — For More Information

16 — EXAMPLE PLANS

17 — REFERENCES

17.1 — Referenced standards

17.2 — Cited references

17.3 — Photo and figure credits

APPENDIX A — DEFINITIONS

APPENDIX B — EXAMPLE STRAND MATERIAL CERTIFICATION

APPENDIX C — EXAMPLE STRESSING JACK CALIBRATION FORM

APPENDIX D — EXAMPLE STRESSING ELONGATION RECORD FORM

APPENDIX E — TABLE OF ELONGATION VALUE

• 75 pages; 8½ x 11 in. (soft cover)

• Published October 2020