1、BRITISH STANDARDBS EN 1744-6:2006Tests for chemical properties of aggregates Part 6: Determination of the influence of recycled aggregate extract on the initial setting time of cementThe European Standard EN 1744-6:2006 has the status of a British StandardICS 91.100.15g49g50g3g38g50g51g60g44g49g42g3
2、g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 1744-6:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 Septe
3、mber 2007 BSI 2007ISBN 978 0 580 53747 9National forewordThis 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
4、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 pu
5、blicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1744-6October 2006ICS 91.100.15English VersionTests for chemical properties of aggregates - Part 6:Determination of the influence of recycled aggregate extract onthe initial setting time of cementEssais pour dterminer l
6、es proprits chimiques desgranulats - Partie 6: Dtermination de linfluence dun extraitde granulat recycl sur le temps de prise initial du cimentPrfverfahren fr chemische Eigenschaften vonGesteinskrnungen - Teil 6: Bestimmung des Einflussesvon Auszgen rezyklierter Gesteinskrnung auf denErstarrungsbegi
7、nn von ZementThis 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 EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliogra
8、phical references concerning such nationalstandards 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 translationunder the responsibility of a CEN
9、member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lit
10、huania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CE
11、N All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1744-6:2006: EEN 1744-6:2006 (E) 2 Contents Page 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
12、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 EN 1744-6:2006 (E) 3 Foreword This document (EN 174
13、4-6:2006) 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 na
14、tional 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 ag
15、gregates 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
16、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/CEN
17、ELEC 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, Mal
18、ta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 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 initia
19、l 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 co
20、ntaminators. 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 1
21、96-3, 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 propertie
22、s 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
23、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
24、 932-5. 5.1 Container, capacity approximately 40 l. 5.2 Funnel, internal diameter 100 mm approximately. EN 1744-6:2006 (E) 5 5.3 Folded coarse filter paper, diameter appropriate (pore diameter approximately 20 m). 5.4 Graduated cylinder, capacity 250 ml. 5.5 Apparatus and equipment for the determina
25、tion 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 o
26、f 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 p
27、rocedures 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
28、). 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 c
29、ontainer. 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 bee
30、n 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). EN 1744-6:2006 (E) 6 9.4 Determination of the initial setting time Prepare a cement paste specimen at a standard consistency in accordance wit
31、h 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
32、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(1) where: tw is the initial setting time (in minutes) of the cement/water (4.2) paste
33、; teis 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 t
34、he sample; c) designation of the sample; d) mass of dry sample tested, in grams; e) result of the test; f) date of the test. EN 1744-6:2006 (E) 7 Bibliography 1 EN 1744-1:1998, Tests for chemical properties of aggregates Part 1: Chemical analysis BS EN 1744-6:2006BSI389 Chiswick High RoadLondonW4 4A
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