Bsi bs en 01744 6 2006 (2007)

BRITISH STANDARD

Tests for chemical
properties of
aggregates —
Part 6: Determination of the influence
of recycled aggregate extract on the
initial setting time of cement

The European Standard EN 1744-6:2006 has the status of a
British Standard

,

ICS 91.100.15

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BS EN
1744-6:2006


BS EN 1744-6:2006

National foreword
This British Standard is the UK implementation of EN 1744-6:2006.
The UK participation in its preparation was entrusted by Technical Committee
B/502, Aggregates, to Subcommittee B/502/6, Test methods.
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 28 September 2007

,

© BSI 2007

ISBN 978 0 580 53747 9

Amendments issued since publication
Amd. No.

Date

Comments


EUROPEAN STANDARD

EN 1744-6

NORME EUROPÉENNE
EUROPÄISCHE NORM

October 2006

ICS 91.100.15

English Version

Tests for chemical properties of aggregates - Part 6:
Determination of the influence of recycled aggregate extract on
the initial setting time of cement
Essais pour déterminer les propriétés chimiques des
granulats - Partie 6: Détermination de l'influence d'un extrait
de granulat recyclé sur le temps de prise initial du ciment

Prüfverfahren für chemische Eigenschaften von
Gesteinskörnungen - Teil 6: Bestimmung des Einflusses
von Auszügen rezyklierter Gesteinskörnung auf den
Erstarrungsbeginn von Zement

This European Standard was approved by CEN on 28 August 2006.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, 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.

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COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG

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© 2006 CEN

All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.

B-1050 Brussels

Ref. No. EN 1744-6:2006: E


EN 1744-6:2006 (E)

Contents

Page

Foreword ............................................................................................................................................................. 3
Scope...................................................................................................................................................... 4

2

Normative references ........................................................................................................................... 4

3

Definitions.............................................................................................................................................. 4

4

Reagents ................................................................................................................................................ 4

5

Apparatus .............................................................................................................................................. 4

6

Principle ................................................................................................................................................. 5

7

Sampling ................................................................................................................................................ 5

8

Preparation of test portion................................................................................................................... 5

9
9.1
9.2
9.3
9.4

Procedure .............................................................................................................................................. 5
General ................................................................................................................................................... 5
Production of the aggregate extract ................................................................................................... 5
Determination of the standard consistence ....................................................................................... 5
Determination of the initial setting time ............................................................................................. 6

10

Calculation and expression of results ................................................................................................ 6

11

Test report ............................................................................................................................................. 6

,

1

2


EN 1744-6:2006 (E)

Foreword
This document (EN 1744-6:2006) has been prepared by Technical Committee CEN/TC 154,
"Aggregates", the secretariat of which is held by BSI.
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 April 2007, and conflicting national
standards shall be withdrawn at the latest by April 2007.

This standard forms part of a series of tests for chemical properties of aggregates. Test methods or
other properties of aggregates will be covered by Parts of the following European Standards:
EN 932 Tests for general properties of aggregates
EN 933 Tests for geometrical properties of aggregates
EN 1097 Tests for mechanical and physical properties of aggregates
EN 1367 Tests for thermal and weathering properties of aggregates
EN 13179 Tests for filler aggregate used in bituminous mixtures
The other parts of EN 1744 are, or will be:
Part 1: Chemical analysis
Part 2: Determination of resistance to alkali reaction
Part 3: Preparation of eluates by leaching of aggregates
Part 4: Determination of water susceptibility of fillers for bituminous mixtures
Part 5: Determination of acid soluble chloride salts

,

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, 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.

3


EN 1744-6:2006 (E)

1

Scope

This European Standard specifies the procedure for the determination of the influence of watersoluble components from recycled aggregates on the initial setting time of cement.
NOTE
A procedure is described in EN 1744-1:1998, clause 15.3, for use with natural aggregates; this
procedure is intended to demonstrate and quantify the effects of organic contaminators. It is not suitable for
recycled aggregates because these may also contain inorganic contaminators.

2

Normative references

The following referenced documents are indispensable for the application of this European Standard.
For dated references, only the edition cited applies. For undated references, the latest edition of the
referenced document (including any amendments) applies.
EN 196-3, Methods of testing cement — Part 3: Determination of setting times and soundness
EN 197-1, Cement — Part 1: Composition, specifications and conformity criteria for common cements
EN 932-1, Tests for general properties of aggregates — Part 1: Methods for sampling
EN 932-2, Tests for general properties of aggregates — Part 2: Methods for reducing laboratory
samples
EN 932-5, Tests for general properties of aggregates — Part 5: Common equipment and calibration

3

Definitions

For the purposes of this standard, the following terms and definitions apply.
3.1
laboratory sample
reduced sample derived from a bulk sample for laboratory testing
3.2

test portion
sample used as a whole in a single test

4

Reagents

4.1

Cement type CEM I conforming to the requirements of EN 197-1.

4.2

Demineralised water or water of equivalent purity.

5

Apparatus

All apparatus shall comply with the general requirements of EN 932-5.
Container, capacity approximately 40 l.

5.2

Funnel, internal diameter 100 mm approximately.

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5.1

4


EN 1744-6:2006 (E)

5.3

Folded coarse filter paper, diameter appropriate (pore diameter approximately 20 µm).

5.4

Graduated cylinder, capacity 250 ml.

5.5 Apparatus and equipment for the determination of the setting time of cement in accordance with
EN 196-3.
5.6

6

Trays to dry the laboratory sample.

Principle

An aggregate test portion is extracted with water to remove water-soluble compounds. The initial
setting time of cement mixed with the extract is compared to the initial setting time of the same
cement mixed with demineralised water.

7

Sampling

The laboratory sample shall be taken in accordance with the procedures specified in EN 932-1.

8

Preparation of test portion

Dry the laboratory sample by spreading it over trays and allowing it to air-dry at ambient temperature.
Using the procedures specified in EN 932-2 further reduce the dried laboratory sample to produce a
test portion of (20 ± 1) kg of aggregate.

9
9.1

Procedure
General

For the purpose of the test, two cement paste test specimens are prepared. One of the
specimens is prepared to standard consistency using water (4.2). The other specimen is
prepared using the same quantity of an aggregate extract as produced (9.2). The initial setting
time of both cement paste specimens is determined as specified in EN 196-3.

9.2

Production of the aggregate extract

Transfer the test portion, obtained as specified in 8, to the container. Add water (4.2) to the
container until the test portion is just covered. Allow the container to stand for 3 h, agitating the
contents by turning every 30 min.
Decant and filter the extract through the coarse filter paper into the graduated cylinder until at

least 150 ml of filtrate has been collected.

9.3

Determination of the standard consistence

,

Determine the standard consistence of the cement in accordance with EN 196-3 by using water (4.2).

5


EN 1744-6:2006 (E)

9.4

Determination of the initial setting time

Prepare a cement paste specimen at a standard consistency in accordance with EN 196-3
using water (4.2). Prepare a second cement paste specimen using the same quantity of filtered
aggregate extract.
NOTE
The cement paste specimen prepared using filtered extract may not be exactly at standard
consistence.

Determine the initial setting time of both cement paste specimens in accordance with EN 196-3.

10 Calculation and expression of results
Calculate the influence A of the aggregate extract in terms of minutes difference in initial setting times,

using the following equation:
A = tw – te
where:
tw is the initial setting time (in minutes) of the cement/water (4.2) paste;
te is the initial setting time (in minutes) of the cement/aggregate extract paste.
A negative value of A indicates a retarding effect, a positive value an accelerating effect.

11 Test report
The test report shall include at least the following:
reference to this European Standard;

b)

source of the sample;

c)

designation of the sample;

d)

mass of dry sample tested, in grams;

e)

result of the test;

f)

date of the test.

,

a)

6

(1)


EN 1744-6:2006 (E)

Bibliography

EN 1744-1:1998, Tests for chemical properties of aggregates — Part 1: Chemical analysis

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[1]

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BS EN
1744-6:2006

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