CSA A864 : 0

CSA A864 Task Group
Preface
1. Scope
2. Definitions and Reference Standards
   2.1 Definitions
   2.2 Reference Standards
3. General
   3.1 The Nature of Alkali-Aggregate Reaction
   3.2 The Current Situation
   3.3 Why Alkali-Aggregate Reaction is Important to the
       Engineer
   3.4 Types of Alkali-Aggregate Reaction
   3.5 Where is Alkali-Aggregate Reactive Concrete Found?
   3.6 General Procedures for Diagnosis of AAR in Structures
4. Field Symptoms of Alkali-Aggregate Reaction
   4.1 Assessment
   4.2 Concrete Surface Features Indicative of AAR
   4.3 Field Symptoms of AAR Affecting Various Types of
       Concrete Structures
5. Diagnosis of Alkali-Aggregate Reaction
   5.1 General
   5.2 Type and Depth of Investigation Required
   5.3 Investigation Team
   5.4 Documentary Evidence
   5.5 Site Investigation
   5.6 Sampling
   5.7 Laboratory Investigation
   5.8 Evaluation of Observations and Diagnosis
6. Petrographic Examination of Concrete for AAR
   6.1 Preliminary Manipulation and Examination of Concrete
       Samples in the Laboratory
   6.2 Petrographic Examination and Signs of Alkali-Aggregate
       Reaction
   6.3 Petrographic Damage Rating
7. Assessment of Future Behaviour of the Concrete Structure
   7.1 Physical Properties
   7.2 Expansion Forecasts
   7.3 Durability Considerations
   7.4 Structural Considerations
8. Retardation and Mitigation
   8.1 Introduction
   8.2 Drainage
   8.3 Cladding and Surface Treatments
   8.4 Maintenance to Reduce Rate of Expansion
   8.5 Deicing Chemicals
   8.6 Chemical Suppression of Alkali-Aggregate Reactivity
   8.7 Restraint of Expansion
   8.8 Mitigation
9. Closing Remarks
Tables
Figures
Appendix A - Proposed Forms for General Surveys of Concrete
             Structures Potentially Affected by AAR
Appendix B - Procedures for Expansion Tests on Cores
Appendix C - Test Procedure for Extraction of Aggregates from
             Cores
Appendix D - Test Procedure for Determination of Water-
             Soluble Alkali Content
Appendix E - Bibliography

Canadian experts on the diagnosis and treatment of concrete structures affected by alkali-aggregate reaction (AAR) have written this guide. Providing information on the symptoms and signs of concrete affected by AAR, how to identify AAR and distinguish it from other mechanisms of deterioration in concrete, and how to assess the severity and extent of AAR in concrete. Also provided advice on the best ways of evaluating, treating and maintaining structures affected by AAR. A Guide of use to owners of structures affected by AAR and people involved in such work.