CAA | Datasheet

TECHNICAL DATA SHEET No 1

NEW ADMIXTURE STANDARD BS EN 934
Admixtures for concrete, mortar and grout

BS EN 934 the new Harmonised European Standard - ‘Admixtures for concrete, mortar and grout.’ replaces BS 5075 and BS 4887, which are withdrawn. BS EN 934 is split into 6 parts:

Part 1	Corrosion behaviour.	Under development
Part 2	Concrete admixtures.	Published 2001
Part 3	Admixtures for mortar	Published 2004
Part 4	Admixtures for grout	Published 2001
Part 5	Admixtures for sprayed concrete	Final vote 2004.
Part 6	Sampling, conformity control, evaluation of conformity, marking and labelling.	Published 2001

Part 6 is not a product standard but gives complementary information that is essential to the implementation of parts 2 to 5, to Factory Production Control and to the provision of information to the customer.

Within each part of EN 934, different types of admixture are covered by name, referring to their primary and in some cases also their secondary function in the same way as in BS 5075. The names are generally the same as those in BS 5075.

Transitional arrangements:

Where existing British Standards and Specifications call up BS 5075 or BS 4887 certification, existing test certification to that standard may still be accepted but testing to the requirements of the appropriate part of BS EN 934 should also be accepted as showing equivalent compliance.

All admixtures covered by BS EN 934 will have to be tested for compliance and CE marked although under UK law it is not mandatory to actually affix a CE mark.

CE marking:

BS EN 934 parts 2 to 5 are harmonised European standards and products conforming to all the requirements and to the requirements of BS EN934 part 6 will be CE marked. UK admixtures covered by EN 934-2 and part 4 are now all CE marked. Mortar admixtures to EN 934-3 will be progressively CE marked during the period 2004 to 2005.

A new CAA code of practice requiring members to show conformity with EN 934 and requiring additional quality related items has been introduced.

This code of practice will include Initial Type Testing documents showing compliance with the requirements of the relevant part of EN 934 and these will progressively become available after 2003.

Admixtures not covered by EN 934

Concrete produced to EN 206 (BS 8500) may only contain admixtures with established suitability. Where admixture types are not covered by EN 934, suitability can be established by compliance with the CAA Guidelines for established suitability.