NZS 3104:2021
Specifications for concrete production
Objective of this standard is to prescribe the minimum requirements for the production of fresh concrete. The standard has been revised to allow an alternative method to calculate target mean concrete compressive strength based on normal distribution theory. In addition, multiple clauses relating to the introduction of an alternative method have been updated, as well as multiple updates to the standard throughout to reflect current practice and technology.
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NZS 3104:2021 Specification for concrete production
Committee representation
Acknowledgement
Copyright
Referenced documents
Latest revisions
Review of standards
Foreword
CONTENTS
1 GENERAL
1.1 Scope
1.2 Interpretation
1.3 Definitions
1.4 Abbreviations
2 PROVISIONS FOR READY-MIXED CONCRETE
2.1 General
2.2 Inspection facilities
2.3 Technical control
2.4 Supervision
2.5 Materials
2.6 Batching plant
2.7 Measurement of materials
2.8 Weighing equipment
2.9 Concrete mixing
2.10 Transportation
2.11 Responsibility for mix design
2.12 Mixing records
2.13 Concrete mixes – General requirements
2.14 Target mean strengths and variability control
2.15 Control tests and their evaluation
2.16 Quality audit
3 PROVISIONS FOR PRESCRIBED MIX CONCRETE
3.1 General
3.2 Supervision and technical control
3.3 Materials
3.4 Prescribed concrete mixes
3.5 Concrete mixing – Loading
4 CONCRETE MIXERS
4.1 General
4.2 Performance
4.3 Batch mixers
4.4 Continuous mixers
APPENDIX A – CHECKLIST FOR AUDITING ENGINEERS
APPENDIX B – REQUIREMENTS AND GUIDANCE FOR CHECKING OF BATCHING WEIGH SCALES
Table 2.1 – Grading recommendations for combined and non-combined coarse aggregates
Table 2.2 – Measurement tolerances of materials
Table 2.3 – Weigh-scale precision
Table 2.4 – Accuracy of weighing equipment and liquid measuring equipment, and frequency of tests
Table 2.5A – Criteria for plants with a minimum testing regime of 10 tests per month
Table 2.5B – Criteria for plants with a minimum testing regime of 6 tests per month
Table 2.5C – Criteria for major series with demonstrated low variability of strength results
Table 2.6 – Recommendations of auditing engineer evaluating series of more than 12 results against criteria in Tables 2.5A and 2.5B
Table 2.7 – Maximum tolerances for slump
Table 2.8 – Performance test requirements of uniformity of concrete for stationary and truck mixers
Table 3.1 – Prescribed mixes
Table 3.2 – Combined aggregate grading requirements
Table 3.3 – Accuracy of measurement
Figure 4.1 – Identification plate for all mixers (example only)
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References
Methods of test for water and aggregate for concrete
Methods of test for concrete - Tests relating to fresh concrete
Methods of test for concrete - Tests relating to the determination of strength of concrete
Water and aggregate for concrete
Specification for Portland and blended cements (General and special purpose)
Specification for pozzolan for use with Portland and blended cement
Specification for portland-limestone filler cement
Concrete masonry buildings not requiring specific engineering design
Related Information
National Code of Practice for Utility Operators’ Access to Transport Corridors
Ministry: Treasury
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AS/NZS 4456:2003 (Set)
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NZS 3104:2021 Specification for concrete production
Committee representation
Acknowledgement
Copyright
Referenced documents
Latest revisions
Review of standards
Foreword
CONTENTS
1 GENERAL
1.1 Scope
1.2 Interpretation
1.3 Definitions
1.4 Abbreviations
2 PROVISIONS FOR READY-MIXED CONCRETE
2.1 General
2.2 Inspection facilities
2.3 Technical control
2.4 Supervision
2.5 Materials
2.6 Batching plant
2.7 Measurement of materials
2.8 Weighing equipment
2.9 Concrete mixing
2.10 Transportation
2.11 Responsibility for mix design
2.12 Mixing records
2.13 Concrete mixes – General requirements
2.14 Target mean strengths and variability control
2.15 Control tests and their evaluation
2.16 Quality audit
3 PROVISIONS FOR PRESCRIBED MIX CONCRETE
3.1 General
3.2 Supervision and technical control
3.3 Materials
3.4 Prescribed concrete mixes
3.5 Concrete mixing – Loading
4 CONCRETE MIXERS
4.1 General
4.2 Performance
4.3 Batch mixers
4.4 Continuous mixers
APPENDIX A – CHECKLIST FOR AUDITING ENGINEERS
APPENDIX B – REQUIREMENTS AND GUIDANCE FOR CHECKING OF BATCHING WEIGH SCALES
Table 2.1 – Grading recommendations for combined and non-combined coarse aggregates
Table 2.2 – Measurement tolerances of materials
Table 2.3 – Weigh-scale precision
Table 2.4 – Accuracy of weighing equipment and liquid measuring equipment, and frequency of tests
Table 2.5A – Criteria for plants with a minimum testing regime of 10 tests per month
Table 2.5B – Criteria for plants with a minimum testing regime of 6 tests per month
Table 2.5C – Criteria for major series with demonstrated low variability of strength results
Table 2.6 – Recommendations of auditing engineer evaluating series of more than 12 results against criteria in Tables 2.5A and 2.5B
Table 2.7 – Maximum tolerances for slump
Table 2.8 – Performance test requirements of uniformity of concrete for stationary and truck mixers
Table 3.1 – Prescribed mixes
Table 3.2 – Combined aggregate grading requirements
Table 3.3 – Accuracy of measurement
Figure 4.1 – Identification plate for all mixers (example only)
Previous versions
NZS 3104:2021
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.