Bridges
Concrete Durability: Development of Models to Predict and extend the Service Life of Concrete Bridges
- Publication no: AP-R245-04
- ISBN: 0 85588 693 5
- Published: 19 April 2004
- PDF (free) Download
Concrete durability is of great interest to State Road Authorities (SRA's), who are responsible for over 8,000 concrete bridges and in excess of 16,000 major culverts, with a replacement value exceeding $8.5 billion. Many of these concrete structures are located in aggressive environments with exposure to seawater of saline ground water, and are at risk of chloride-induced corrosion of steel reinforcement. Ingress of chloride ions, derived from these sources, to the depth of steel in concrete is the major cause of the corrosion.
- EXECUTIVE SUMMARY
- TABLE OF CONTENTS
- 1. INTRODUCTION
- 2. BACKGROUND
- 3. EXPERIMENTAL DETAILS
- 3.1. Experimental variables
- 3.2. Design of slab specimens for corrosion test
- 4. METHODOLOGY
- 4.1. Measurement of Corrosion Rate
- 5. RESULTS
- 5.1. Strength
- 5.2. Reinforcement corrosion
- 5.3. Discussions
- 5.4. Crack formation due to expansion of bar pressing the surrounding concrete
- 5.5. Comparison of model calculation and test results
- 5.6. Prediction of crack formation in the experimental slabs
- 5.7. Prediction of time to cracking
- 6. RECOMMENDATIONS
- 7. CONCLUSIONS
- 8. REFERENCES
- APPENDIX 1 — PHOTOGRAPHIC RECORD OF EXPERIMENTAL SLAB
- APPENDIX 2 — PHOTOGRAPHIC RECORD OF REINFORCED SLAB
- APPENDIX 3 — LENGTH CHANGE RESULTS
- APPENDIX 4 — CORROSION OF BARS AND CONCRETE EXPANSION(SLABS SHOWING CRACKS)
- APPENDIX 5 — REVIEW ON THE SERVICE LIFE PREDICTION
- APPENDIX 6 — AN OVERVIEW OF LITERATURE ON THE CHLORIDE BINDINGCAPACITY OF CONCRETE AND INFLUENCE ON THE CHLORIDEDIFFUSION
- APPENDIX 7 — TIME TO CRACKING OF COVER CONCRETE INREINFORCED CONCRETE STRUCTURES
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