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1、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 The European Standard EN 1744-6:2006 has the status of a British Standard ICS 91.100.15 ? Licensed Copy: London So
2、uth Bank University, London South Bank University, Fri Oct 05 02:52:09 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 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 for
3、eword 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 secre
4、tary. 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 Amd. No. DateComments Licensed Copy:
5、 London South Bank University, London South Bank University, Fri Oct 05 02:52:09 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1744-6 October 2006 ICS 91.100.15 English Version Tests for chemical properties of aggregates - Part 6: Determination of th
6、e influence of recycled aggregate extract on the initial setting time of cement Essais pour dterminer les proprits chimiques des granulats - Partie 6: Dtermination de linfluence dun extrait de granulat recycl sur le temps de prise initial du ciment Prfverfahren fr chemische Eigenschaften von Gestein
7、skrnungen - Teil 6: Bestimmung des Einflusses von Auszgen rezyklierter Gesteinskrnung 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
8、 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 version
9、s (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, Cyp
10、rus, 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
11、OMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2006 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1744-6:2006: E Licensed Copy: London South Bank University, Lon
12、don South Bank University, Fri Oct 05 02:52:09 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 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 test portion. 5 9 Procedure 5 9.1 Gene
13、ral. 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 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:
14、52:09 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 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
15、 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 wil
16、l 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 1
17、3179 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 f
18、or 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, Fi
19、nland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Fri Oc
20、t 05 02:52:09 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 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 initial setting time of cement. NOTE A procedure is described in EN
21、 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
22、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 sett
23、ing 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 sampl
24、es 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
25、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 Funne
26、l, internal diameter 100 mm approximately. Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:52:09 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 1744-6:2006 (E) 5 5.3 Folded coarse filter paper, diameter appropriate (pore diameter approximately 20 m). 5.4 Gradu
27、ated 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 ti
28、me 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
29、 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 prepar
30、ed. 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 aggr
31、egate 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 filte
32、r 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). Licensed Copy: London South Bank University, London South Bank Un
33、iversity, Fri Oct 05 02:52:09 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 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 with EN 196-3 using water (4.2). Prepare a second cement paste specimen using the same q
34、uantity 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 infl
35、uence 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; te is the initial setting time (in minutes) of the cement/aggregate extract paste.
36、 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)
37、 result of the test; f) date of the test. Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:52:09 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 1744-6:2006 (E) 7 Bibliography 1 EN 1744-1:1998, Tests for chemical properties of aggregates Part 1: Chemical analysi
38、s Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:52:09 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 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 Brit
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