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Concrete Part 2. Methods for specifying concrete mixes

1CS 91.100.30

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Section 1. General Introduction

Purchasers ordering in accordance with this standard are advised to specify quality assurance requirements for materials or for concrete in their purchasing contracts to assure themselves that products specified in accordance with BS 5328 consistently achieve the required level of quality.

Purchasers of ready-mixed concrete are advised to specify certification meeting the requirements of the United Kingdom Accreditation Service, National Accreditation of Certification Bodies, for product conformity. They are similarly advised to specify that, where they are available, constituent materials should be obtained from suppliers operating quality systems in accordance with BS EN ISO 9000.

Section 5 gives a new method of specifying concrete, the designated mix. This method of specification is primarily aimed at in situ concrete applications and it is unlikely to be applicable to factory-produced precast concrete.

1.1 Scope

This Part of BS 5328 gives methods for specifying concrete. The purchaser specifies a mix designation appropriate to the end use and this is an instruction to the producer to comply with the requirement that the producer holds current conformity certification based on product testing and surveillance coupled with approval of the producer's quality system to BS EN ISO 9001 by a certification body accredited by the Secretary of State (or equivalent) for the relevant areas of product and systems conformity certification, as this is the prime means of controlling conformity.

1.2 References

1.2.1 Normative references

This Part of BS 5328 incorporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments or revisions of the cited publication apply to this Part of BS 5328 only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments.

1.2.2 Informative references

This Part of BS 5328 refers to other publications that provide information or guidance. Editions of these publications current at the time of the issue of this standard are listed on the inside back cover, but reference should be made to the latest editions.

1.3 Definitions

For the purposes of this Part of BS 5328, the definitions given in BS 5328 Part 4:1990 and BS 5328:Part 1 and BS 6100 apply.