untitled , BRITISH STANDARD BS EN 1744 6 2006 Tests for chemical properties of aggregates — Part 6 Determination of the influence of recycled aggregate extract on the initial setting time of cement Th[.]
Trang 1BRITISH STANDARD BS EN
1744-6:2006
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
12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$:
Trang 2BS EN 1744-6:2006
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
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.
Amendments issued since publication
Trang 3EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
EN 1744-6
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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
C O M I T É E U R O P É E N D E N O R M A L I S A T I O N
E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.
Ref No EN 1744-6:2006: E
Trang 4EN 1744-6:2006 (E)
2
Foreword 3
1 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 Procedure 5
9.1 General 5
9.2 Production of the aggregate extract 5
9.3 Determination of the standard consistence 5
9.4 Determination of the initial setting time 6
10 Calculation and expression of results 6
11 Test report 6
Trang 5EN 1744-6:2006 (E)
3
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
Trang 6EN 1744-6:2006 (E)
4
1 Scope
This European Standard specifies the procedure for the determination of the influence of water-soluble components from recycled aggregates on the initial setting time of cement
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
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
5.1 Container, capacity approximately 40 l
5.2 Funnel, internal diameter 100 mm approximately
Trang 7EN 1744-6:2006 (E)
5
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 Trays to dry the laboratory sample
6 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 Procedure
9.1 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)
Trang 8EN 1744-6:2006 (E)
6
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
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:
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:
a) 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
Trang 9EN 1744-6:2006 (E)
7
Bibliography
[1] EN 1744-1:1998, Tests for chemical properties of aggregates — Part 1: Chemical analysis
Trang 10BS EN
1744-6:2006
BSI
389 Chiswick High Road
London
W4 4AL
BSI — British Standards Institution
BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter
Revisions
British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions
It is the constant aim of BSI to improve the quality of our products and services
We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover
Tel: +44 (0)20 8996 9000 Fax: +44 (0)20 8996 7400
BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards
Buying standards
Orders for all BSI, international and foreign standards publications should be addressed to Customer Services Tel: +44 (0)20 8996 9001
Fax: +44 (0)20 8996 7001 Email: orders@bsi-global.com Standards are also available from the BSI website at http://www.bsi-global.com
In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested
Information on standards
BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre
Tel: +44 (0)20 8996 7111 Fax: +44 (0)20 8996 7048 Email: info@bsi-global.com Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details
of these and other benefits contact Membership Administration
Tel: +44 (0)20 8996 7002 Fax: +44 (0)20 8996 7001
Email: membership@bsi-global.com
Information regarding online access to British Standards via British Standards Online can be found at http://www.bsi-global.com/bsonline
Further information about BSI is available on the BSI website at http://www.bsi-global.com
Copyright
Copyright subsists in all BSI publications BSI also holds the copyright, in the
UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI
This does not preclude the free use, in the course of implementing the standard,
of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained
Details and advice can be obtained from the Copyright & Licensing Manager Tel: +44 (0)20 8996 7070 Fax: +44 (0)20 8996 7553
Email: copyright@bsi-global.com