EN 934-6:2019

Admixtures for concrete, mortar and grout - Part 6: Sampling, assessment and verification of the constancy of performance

This document specifies the procedures for sampling and for the assessment and verification of the constancy of performance (AVCP) for admixtures covered by the series EN 934.

Zusatzmittel für Beton, Mörtel und Einpressmörtel - Teil 6: Probenahme, Bewertung und Überprüfung der Leistungsbeständigkeit

Dieses Dokument legt die Verfahren für die Probenahme und die Bewertung und Überprüfung der Leistungsbeständigkeit (AVCP) für Zusatzmittel fest, die durch die Normenreihe EN 934 abgedeckt werden.

Adjuvants pour béton, mortier et coulis - Partie 6 : Échantillonnage, évaluation et vérification de la constance des performances

Le présent document spécifie les procédures d’échantillonnage, d’évaluation et de vérification de la constance des performances (EVCP) pour les adjuvants couverts par la série EN 934.

Kemijski dodatki za beton, malto in injekcijsko maso - 6. del: Vzorčenje, ocenjevanje in preverjanje nespremenljivosti lastnosti

Ta evropski standard določa postopke za vzorčenje, ocenjevanje in preverjanje nespremenljivosti lastnosti (AVCP) za kemijske dodatke, zajete v skupini standardov EN 934.

General Information

• Status: Published
• Publication Date: 05-Mar-2019
• Withdrawal Date: 29-Sep-2019
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: CEN/TC 104 - Concrete ( performance, production, placing and compliance criteria )
• Drafting Committee: CEN/TC 104/SC 3 - Admixtures for concrete
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 24-Jun-2025
• Completion Date: 23-Sep-2025
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Mandate: M/128 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on products for concrete, mortar and grout
• Ref Project: SIST EN 934-6:2019 - Admixtures for concrete, mortar and grout - Part 6: Sampling, assessment and verification of the constancy of performance

Relations

• Replaces: EN 934-6:2001 - Admixtures for concrete, mortar and grout - Part 6: Sampling, conformity control and evaluation of conformity
• Effective Date: 13-Mar-2019
• Replaces: EN 934-6:2001/A1:2005 - Admixtures for concrete, mortar and grout - Part 6: Sampling, conformity control and evaluation of conformity
• Effective Date: 13-Mar-2019

Overview

EN 934-6:2019 is a European Standard developed by CEN, focusing on admixtures for concrete, mortar, and grout. This part of the EN 934 series specifies procedures for sampling, as well as the assessment and verification of the constancy of performance (AVCP) for these admixtures. It ensures that materials used in construction products maintain consistent quality and performance throughout production, delivery, and use.

This standard harmonizes sampling and quality control processes across European countries, underpinning the reliable use of admixtures in concrete technology. It supersedes the earlier EN 934-6:2001 and aligns terminology with EU Construction Products Regulation (EU 305/2011).

Key Topics

1. Sampling Procedures

The standard outlines specific sampling methodologies to ensure representative samples of admixtures are taken:

• Sampling from Manufacturer's Stock:

  • For powdered admixtures, sub-samples from at least six bags are mixed to produce a bulk sample.
  • For liquid admixtures, samples are taken either from containers or tank loads with careful agitation and division into three equal parts for storage.

• Sampling at Delivery: Performed before unloading to confirm product quality upon receipt.

• Sampling for Factory Production Control: Sampling processes must be documented and follow rigorous protocols to guarantee ongoing product conformity.

• Storage of Samples: Samples are stored in airtight containers protected from moisture and light for at least one year or until the use-by date.

2. Assessment and Verification of Constancy of Performance (AVCP)

The AVCP process ensures admixtures consistently meet performance criteria declared by manufacturers through:

• Type Testing: Required when new formulations are introduced or changes in raw materials or formulation occur, potentially impacting admixture performance.
• Factory Production Control (FPC): Manufacturers must maintain documented procedures and control records, perform regular inspections, and continuously monitor production processes.
• Conformity Criteria: Admixtures must comply with the specifications and test methods detailed in other parts of the EN 934 series, assuring uniform product quality.

3. Documentation and Record Keeping

Records must capture essential data including sample date, batch identification, physical state, color, and personnel involved in sampling. This traceability supports transparency and regulatory compliance.

Applications

EN 934-6:2019 applies widely in the construction industry, particularly wherever admixtures for concrete, mortar, or grout are used for building, infrastructure, and civil engineering projects. Its practical applications include:

• Quality assurance in manufacturing admixtures to guarantee uniform properties batch after batch.
• Performance verification of admixtures used in concrete mixes to enhance properties such as workability, setting time, and durability.
• Ensuring compliance with legal and contractual requirements for construction materials across EU markets.
• Supporting manufacturers, suppliers, and contractors with a standardized procedure to minimize disputes related to product quality.

The standard promotes safety, durability, and reliability in concrete-related products by enabling consistent quality control aligned with European regulatory frameworks.

Related Standards

EN 934-6:2019 is part of the comprehensive EN 934 series dedicated to admixtures for concrete, mortar, and grout. Relevant related standards include:

• EN 934-1: Common requirements for admixtures.
• EN 934-2: Concrete admixtures - definitions, requirements, conformity, marking, and labelling.
• EN 934-3: Admixtures for masonry mortar - specifications and conformity.
• EN 934-4: Admixtures for grout used in prestressing tendons.
• EN 934-5: Admixtures for sprayed concrete.

These parts complement EN 934-6 by detailing performance requirements, test methods, and regulatory compliance mechanisms for various admixture types and applications.

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Keywords: EN 934-6:2019, admixtures for concrete, mortar, grout, sampling procedures, performance verification, AVCP, factory production control, type testing, construction standards, European standard for admixtures, concrete admixture quality, admixture sampling, conformity assessment.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2019
1DGRPHãþD
SIST EN 934-6:2002
SIST EN 934-6:2002/A1:2006
.HPLMVNLGRGDWNL]DEHWRQPDOWRLQLQMHNFLMVNRPDVRGHO9]RUþHQMH
RFHQMHYDQMHLQSUHYHUMDQMHQHVSUHPHQOMLYRVWLODVWQRVWL
Admixtures for concrete, mortar and grout - Part 6: Sampling, assessment and
verification of the constancy of performance
Zusatzmittel für Beton, Mörtel und Einpressmörtel - Teil 6: Probenahme, Bewertung und
Überprüfung der Leistungsbeständigkeit
Adjuvants pour béton, mortier et coulis - Partie 6 : Échantillonnage, évaluation et
vérification de la constance des performances
Ta slovenski standard je istoveten z: EN 934-6:2019
ICS:
91.100.10 Cement. Mavec. Apno. Malta Cement. Gypsum. Lime.
Mortar
91.100.30 Beton in betonski izdelki Concrete and concrete
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 934-6
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2019
EUROPÄISCHE NORM
ICS 91.100.10; 91.100.30 Supersedes EN 934-6:2001
English Version
Admixtures for concrete, mortar and grout - Part 6:
Sampling, assessment and verification of the constancy of
performance
Adjuvants pour béton, mortier et coulis - Partie 6 : Zusatzmittel für Beton, Mörtel und Einpressmörtel -
Échantillonnage, évaluation et vérification de la Teil 6: Probenahme, Bewertung und Überprüfung der
constance des performances Leistungsbeständigkeit
This European Standard was approved by CEN on 26 November 2018.

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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 934-6:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Sampling . 5
4.1 General . 5
4.2 Sampling from the manufacturer's stock . 5
4.2.1 General . 5
4.2.2 Powder admixture (in packages) . 5
4.2.3 Liquid admixture . 6
4.3 Sampling at delivery . 6
4.4 Sampling for factory production control . 6
4.5 Record . 7
5 Assessment and verification of consistency of performance - AVCP . 7
5.1 General . 7
5.2 Conformity criteria . 7
5.3 Type testing . 7
5.4 Factory production control . 8
5.4.1 General . 8
5.4.2 Production control manuals . 8
5.4.3 Production control records . 9
5.4.4 Initial inspection of factory and FPC . 9
5.4.5 Continuous surveillance of FPC . 9
5.4.6 Procedure for modifications . 10
Annex A (informative) Calibration of measuring equipment . 11
A.1 General . 11
A.2 Manufacturing equipment . 11

European foreword
This document (EN 934-6:2019) 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 September 2019, and conflicting national standards
shall be withdrawn at the latest by month year of September 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 934-6:2001.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
This document is cited in harmonized European Standards EN 934 parts 2, 3, 4 and 5. The technical
content of this document has not been changed in this revision but in support of the harmonized
European Standards in the EN 934 series, the terminology has been amended to align with the CEN
guidance given for the drafting of all documents conforming to the requirements of the Construction
Products Regulation EU 305/2011.
EN 934, Admixtures for concrete, mortar and grout is currently composed of the following parts:
— Part 1: Common requirements
— Part 2: Concrete admixtures — Definitions, requirements, conformity, marking and labelling
— Part 3: Admixtures for masonry mortar — Definitions, requirements, conformity and 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, assessment and verification of the constancy of performance
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
1 Scope
This document specifies the procedures for sampling and for the assessment and verification of the
constancy of performance (AVCP) for admixtures covered by the series EN 934.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 934-1, Admixtures for concrete, mortar and grout - Part 1: Common requirements
EN 934-2, Admixtures for concrete, mortar and grout - Part 2: Concrete admixtures - Definitions,
requirements, conformity, marking and labelling
EN 934-3, Admixtures for concrete, mortar and grout - Part 3: Admixtures for masonry mortar -
Definitions, requirements, conformity and marking and labelling
EN 934-4, Admixtures for concrete, mortar and grout - Part 4: Admixtures for grout for prestressing
tendons - Definitions, requirements, conformity, marking and labelling
EN 934-5, Admixtures for concrete, mortar and grout - Part 5: Admixtures for sprayed concrete -
Definitions, requirements, conformity, marking and labelling
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
batch
quantity of admixture which can be considered to have a uniform composition
Note 1 to entry: A tank load can be considered as the equivalent of a batch.
3.2
responsible person
person appointed by the manufacturer whose duties include implementation of all or a defined part of
the production control manual
4 Sampling
4.1 General
Sampling of admixtures shall be carried out in such a way that the resulting sample is representative of
the batch to be inspected.
The following procedures shall be used:
— for type testing and in case of dispute, 4.2;
— at time of delivery, 4.3;
— for factory production control, 4.4.
If required, sampling shall be carried out in the presence of all the parties concerned.
4.2 Sampling from the manufacturer's stock
4.2.1 General
Each sample shall represent not more than one batch. For continuous production of an admixture, one
sample taken from up to 25 t may be regarded as representative.
4.2.2 Powder admixture (in packages)
The sample shall be composed of sub-samples from 6 packages (bags) or if the total number of packages
(bags) is less than 6, from all packages (bags). The sub-samples are to be taken from packages (bags)
distributed at random throughout the consignment.
One of the following procedures shall be applied:
a) where the packages contain up to 500 g, take all the contents of each package;
b) where the packages contain more than 500 g, use one of the following methods:
1) insert a sampling tube, which takes a core not less than 25 mm in diameter, into the packages
so that it takes a core of the material from substantially the entire length of the package;
2) empty one of the packages to be sampled on to a clean dry surface and mix the material. Take
at least three portions of no
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