Table of Contents

• Executive Summary
• Abstract
• List of Figures
• List of Tables

  • 1. INTRODUCTION
    • 1.1 Background
    • 1.2 Objective of the Study and Project Plans
    • 1.3 Previous Studies

  • 2. TECHNICAL APPROACH

    • 2.1 Field Observations of Pavements
    • 2.2 Analysis of Concrete Mixture Design
    • 2.3 Cement Composition Analyses
    • 2.4 Specimen Preparation
    • 2.5 Air Void System Analysis

  • 3. RESULTS
    • 3.1 Air Void Analysis
    • 3.2 Petrographic Analysis
      • Iowa 175 Test Road
      • Iowa 175 Cores
      • Site Description US 20, Mile 134.4
      • Core Descriptions
      • US 20 Location 2, Webster County
      • Core Descriptions
      • US 20, Webster County Location 3
      • Core Descriptions
      • Iowa I-35, Story County
      • Iowa I-80

  • 4. DISCUSSION AND CONCLUSIONS
    • 4.1 Primary Cause of Pavement Deterioration
    • 4.2 The Significance of Secondary Ettringite
    • 4.3 Freezing and Thawing
    • 4.4 Microcracking
    • 4.5 Alkali-Aggregate Reaction
    • 4.6 Delayed Ettringite Formation
    • 4.7 Fly Ash

  • 5. ACKNOWLEDGEMENTS

  • Appendix A

  • 6. REFERENCES