Concrete NZ operates a Plant Auditing Scheme to which all Allied Concrete plants comply. This scheme aims to provide independent verification that all plants audited under the scheme produce concrete in compliance with the requirements of NZS 3104.

The Classification Scheme is ISO 9001 which means:

• The ISO 9001 certification of the Plant Audit Committee means that the systems and procedures of the Plant Audit Committee have been audited and found to be satisfactory according to an internationally recognised standard.
• It means that the Committee itself has been judged to have effective systems and controls.
• Customers of audited plants can have confidence that their suppliers’ concrete manufacturing processes have been checked by a body with ISO approved systems.
• Concrete supplied from an audited Ready Mixed Concrete plant is to be of consistently high quality and meets all local authority requirements.

Allied Concrete Plant Engineers routinely monitor all plants to ensure continuing compliance with all the relevant standards.

Please note that Allied Concrete tests all concrete in accordance with NZS 3112, 3109 and 3104. Should for any reason specific testing is required then pricing for this purpose should be sought.

All our mixes are designed in accordance with NZS 3109 and NZS 3104

Concrete Testing Requirements for Large Commercial Pours

Concrete is a unique product when it is delivered to your construction project. It is delivered in a form that does not reflect its properties in a finished state, it’s a time sensitive product, requires care during placement and time (28 days or more) to develop its ultimate performance and strength properties. To obtain a reliable assessment of its fitness for use on a project, accurately performed sampling and testing is required.

Concrete testing procedures are stipulated in a series of Standards that specify the steps to be followed to obtain a representative sample of what is being used in your project, while enabling test results to be replicated repeatedly during the project to generate a creditable database of strength test results to provide the Designer confidence that what he or she specified, to meet design assumptions, have been delivered to site.

Test data gathered by experienced Allied Concrete Technicians is then used to manage material suppliers (aggregates, water, cement and any admixtures that were selected or specified) to ensure that the concrete meets the strength requirements of the specific concrete strength (Grade Strength) selected by the Designer.

“Allied Concrete test over 1300 different loads of concrete every month to maintain stringent quality control over concrete production.”

NZS 3104 is the standard that nominates the safety margin that all reputable ready-mix suppliers need to apply to the nominated concrete strength, to ensure that the concrete supplied meets the strength requirements for the project. NZS 3104 establishes rejection criteria for low strength test results, and the NZRMCA Plant Audit rules defines actions necessary if there is a suspected low-test result.

The nature of concrete is such that for every error or departure from the Standard there is a drop in concrete strength at the time of test. Adhering to all testing procedures is critical for a representative sample result. Allied Technical staff have observed that samples taken on site and then returned to the laboratory also exhibit significant strength loses, even when sampled in accordance with NZS 3104.  This is because site samples can be kept at a much wider range of temperatures than those in a laboratory.

Allied Concrete test over 1300 different loads of concrete every month to maintain stringent quality control over concrete production. Allied do not use site derived test data as part of their regular testing regime for this reason and encourage their customers to accept test data that forms part of the NZRMCA Plant Audit Scheme, an independent and rigorous audit of quality systems in place at a ready mixed concrete plant to meet the requirements of ISO 9002, in which all Allied Concrete plants comply and exceed annually.