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OCR for page R3
TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
ACKNOWLEDGMENTS
ABSTRACT
SUMMARY
CHAPTER 1 INTRODUCTION AND RESEARCH APPROACH
1.1 Introduction
1.2
1.3
1.4
Research Objective
Research Approach
Report Contents
CHAPTER 2 FINDINGS
2. 1 Corrosion Performance n~Pr-~ct ~om~ntn1 Bridges
2. 1 . 1 United Kingdom and European ~xpenence
2. 1 . 1 . 1 Literature Review
2. 1.2 North American Experience
2. 1 .2. 1 Literature Review
2.1.2.2
w~ Jo ~ ~- ~_ _~__A ~=7 ~
Survey
2.2
2.3
2.4
Current Design and Construction Practice
2.2. 1 United Kingdom
2.2.1.1
2.2. 1.2
2.2.1.3
2.2.2
United States
2.2.2. 1
2.2.2.2
2.2.2:3
Segmental Construction
Duct Type
Grouting
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Segmental Construction
Duct Type
Grouting
Current Inspection and Repair Practice
Inspection
2.3.~.1
2.3. 1.2
Grouting
Corrosion-Induced Tendon Damage
2.3.2 Repair Techniques
Past and Current Research
2.4. 1 University of Texas Study
2.4. 1. 1 Test Program
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2.4. 1.2 Preliminary Test Results
2.4.2 Non-Segmental Related Corrosion Studies
CHAPTER 3 STUDY [IMPLICATIONS .......................................
3.1
3.2
3.3
3.4
Comparative United Kingdom/United States Experience
Design and Construction Practice
Inspection and Evaluation Techniques
Repair
CHAPTER 4 CONCLUSIONS AND SUGGESTED RESEARCH
REFERENCES
APPENDIX
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A1
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LIST OF FIGURES
Figure 2-1 Joint Conditions for Segmental Bridges - Internal Tendons . . . . . . . . . . . . . . . . . 9
Figure 2-2 Joint Conditions for Segmental Bridges - External Tendons . . . . . . . . . . . . . . . 10
Figure 2-3 Post-Tensioned Cantilever Beams Located at the Pier Sections ofthe Bridge . . 16
Figure 2-4 Post-Tensioned Cantilever Beam: (a) Elevation of One-Half of a
Cantilever Beam, Showing the Parabolic Profile of the Tendon Duct Tested;
(b) Cross-Section Showing Tendon Locations in the Region of Testing
Figure 2-5
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Exposed, Fully-Grouted Duct
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Figure 2-6 Partially Grouted Tendon Duct Found by Impact-Echo . . . . . . . . . . . . . . . . . . . 1 7
Figure 2-7 Ungrouted Tendon Duct Found by Impact-Echo (Note Minimal
Corrosion After 30 Years of Exposure) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 2-S Typical Test Schematic for Segmental Joint . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 2-9 Metal Duct Showing Severe Corrosion (White Line Indicates
Location of Segment Joint) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 2- 1 0 Strand in the Vicinity of the Segment Joint Showing No
Corrosion (White Line Indicates Location of Segment Joint)
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LIST OF TABLES
Table 2-1
Table 2-2
Table 2-3
Segment Joint Types (from survey)
Select Current U.K. Grout Requirements
Select Current U.S. Grout Requirements
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