National foreword

This British Standard is the UK implementation of EN 934‑1:2008.

The UK participation in its preparation was entrusted by Technical Committee B/517, Concrete, to Subcommittee B/517/3, Admixtures.

A list of organizations represented on this committee can be obtained on request to its secretary.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2008

This European Standard was approved by CEN on 24 October 2007.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Foreword

This document (EN 934‑1:2008) has been prepared by Technical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2008, and conflicting national standards shall be withdrawn at the latest by July 2008.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This standard is part of the series EN 934 “Admixtures for concrete, mortar and grout”, which is comprised of the following additional parts:

Part 2 Concrete admixtures - Definitions, requirements, conformity, marking and labelling
Part 3 Admixtures for masonry mortar - Definitions, requirements, conformity, marking and labelling
Part 4 Admixtures for grout for prestressing tendons - Definitions, requirements, conformity, marking and labelling
Part 5 Admixtures for sprayed concrete - Definitions, requirements, conformity, marking and labelling
Part 6 Sampling, conformity control and evaluation of conformity

This draft European Standard is used with the standards of the EN 480 series which comprises the test methods for admixtures.

This standard has been prepared under a mandate issued to CEN by the European Commission and the European Free Trade Association and supports essential requirements of the Construction Products Directive.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

Introduction

This European Standard covers the requirements that are common to all admixtures. The general requirements replace those which were previously included in EN 934 parts 2 to 5. They include the requirements for the effect on corrosion behaviour when admixtures are used in concrete, mortar or grout containing embedded metal.

The requirements for corrosion behaviour in this standard include an approved list and a declared list of active substances used in some admixtures. These lists are based on experience, which shows that the use of admixtures only containing substances on the approved list do not promote the corrosion of embedded steel. Materials on the declared list are subject, in some countries, to national restrictions on their use for certain applications and should be declared on the CE mark.

The specific requirements that characterise the performance of an admixture in a cementitous mix are detailed in EN 934 parts 2 to 5.

The special requirements are new and relate to specific uses of admixtures and/or their effect on the environment. It is anticipated that, in the future, special requirements will result from European legislation and, for example, will be applicable to admixtures used in concrete or mortar in contact with drinking water and to the release of dangerous regulated substances.

1 Scope

This European Standard specifies the common requirements for all admixtures covered by EN 934‑2, EN 934‑3, EN 934‑4 and EN 934‑5, which contain the specific requirements for each type of admixture.

The requirements for corrosion behaviour are not applicable to chloride based admixtures.

2 Normative references

3 Terms and Definitions

4 General requirements

5 Corrosion behaviour

5.1 Testing and labelling

5.2 Test requirement

6 Special requirements

BS EN 934-1:2008

Admixtures for concrete, mortar and grout - Common requirements

Current, Under Review

Published:

31 Mar 2008