Quality assurance for concrete are specified in the following New Zealand Standards:
- NZS 3104:2003 Specification for Concrete Production
- NZS 3109:1997 Concrete Construction
Ready Mixed Concrete Plant Audit Scheme
The New Zealand Ready Mixed Concrete Association (now Concrete NZ Readymix Sector Group) has a Plant Classification Scheme provides an independent audit of a ready mixed concrete plant's own quality system.
Audits are carried out by the Plant Audit Committee of five or more registered engineers. Members include representatives from the New Zealand Concrete Society (now Concrete NZ Learned Society) and Engineering New Zealand.
The committee is resourced to enable it to conduct reviews to a high and consistent standard throughout New Zealand.
Its operations are carried out under a quality assurance programme certified to ISO 9001 and audited by Bureau Veritas (New Zealand) Limited.
The Scheme requires compliance with NZS 3104:2003 Specification for Concrete Production (including amendments 1 & 2) and the relevant parts of related documents.
An appropriately qualified employee who carries out concrete testing at each plant.
A plant engineer who is either a chartered professional engineer or a registered engineering associate.
Properly maintained records, with the following original records retained on-site to provide an audit trail confirming the test records analysed are correct and complete:
- the original day sheet compiled by the batcher showing each load sampled.
- the original technician's record of tests carried out on samples referenced to the batch record.
- the original summary of results forwarded to the plant engineer, referenced to the above test and batch reports.
- an annual report from the plant engineer to the Committee (and at other times should they require it) on the performance of the plant, and quarterly reports on the frequency of sampling and testing of concrete.
- on-site audits of plant performance by an Auditing Engineer appointed by the committee, without prior notice.