Civil Engineering Association

Technical Report 3 Alcali Silica Reaction by Cement&Concrete Association of New Zealand (Second Edition)

Technical Report 3 Alcali Silica Reaction. Minimising the Risk of Damage to Concrete Guidance Notes and Recommended Practice (Second Edition)
By: Cement & Concrete Association of New Zealand
ISSN: 1171-4204
ISBN: 0908956185
Pages: 90

Contents:
1. Introduction
2. Recommended Practice for Minimising the Risk of ASR
3. ASR in New Zealand
4. Alkali-Aggregate Reactions
5. Principles of Minimising the Risk of ASR
6. Assessment of Aggregates
7. Estimation of Alkali Contributed by Concrete Constitutents
Apendix A: Glossary
Apendix B: Chemistry of the Alkali Silica Reaction
Apendix C: Sample Calculations
Apendix D: Results of Testing Aggregates Using ASTM C289

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TR 3 Alkali Silica Reaction

This document was written to provide a comprehensive review of New Zealand and international experience and research that would enable concrete specifiers and suppliers to minimise the risk of damage caused by alkali silica reaction (ASR) in New Zealand concrete.
It applies to concrete to be used in new construction. It does not apply to the repair or control of damage in existing structures.
The practice recommended herein applies to concrete containing:
- potentially reactive aggregates (i.e. aggregates that test as potentially reactive or are known to have reacted in site concrete, or aggregates of a type shown by laboratory tests or field performance to be potentially reactive); or
- aggregates of unknown reactivity.
It does not apply to concrete containing aggregates known to be non-reactive.
The New Zealand construction industry often refers to “alkali aggregate reaction” (AAR) instead of “alkali silica reaction” (ASR). ASR is the specific type of alkali aggregate reaction that is of concern in New Zealand. This document does not apply to alkali carbonate reactions (ACR), which to date have not been an issue in New Zealand because limestone has not been widely used as a concrete aggregate here.

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