Description

This Standard gives essential requirements for water and aggregates, other than lightweight aggregates, suitable for use as materials for making concrete to meet normal structural and durability requirements.

This Standard is a revision of NZS 3121:1986 and presents criteria for avaluating the suitability of water and aggregate for use in concrete. 

Higher environmental requirements on the disposal of concrete waste have resulted in routine use of recycled water as mix water and increasingly, the use of recycled concrete aggregate, requiring the introduction of new controls. Different aggregates require different assessment methodologies and consequently control limits.

The Standard provides for the use in concrete of sands blended from two or more size ranges which, individually, may not meet the requirements of this Standard.