Revised TR3: ASR Guidance Updated

With input from across industry, Technical Report 3 (TR3) Alkali Silica Reaction: Minimising the Risk of Damage to Concrete: Guidance Notes and Recommended Practice, previously published by the Cement & Concrete Association of New Zealand (CCANZ), has been revised.

This 2021 Concrete NZ edition provides sufficient information based on current New Zealand experience and internationally accepted practices to enable the wider concrete industry to minimise the risk of Alkali Silica Reaction (ASR) damage in new concrete structures.

The new edition supersedes the 2012 CCANZ version, with the principal changes being:

• The maximum concrete alkali limit for normal concrete has been increased to 2.8 kg/m³.
• Testing protocols have been updated to reflect international practice.
• The provisions covering the use of supplementary cementitious materials have been updated.
• Appendices have been expanded to include modern testing methodologies.

The report’s recommendations comprise an acceptable solution to the requirements of NZS 3104 Specification for Concrete Production and NZS 3101 Concrete Structures Standard for minimising the risk of ASR damage in new concrete in New Zealand.

TR3 will continue to be updated as research, field experience, and international practice identify further improvements.

Download Technical Report 3 (TR3) Alkali Silica Reaction.

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