Bridges

Cover of Concrete Durability: Development of Models to Predict and extend the Service Life of Concrete 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

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