Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.
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 . . . . . . . . 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 3 3 3 4 5 6 ............ 6 6 ....... 6 7 8 11 11 12 12 12 13 13 13 14 15 15 15 18 20 20 20 20
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 . 22 24 25 25 26 27 27 29 31 A1
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 ...... 16 Exposed, Fully-Grouted Duct 17 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) . 23
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 . . 11 .. 13 .. 14
