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1、BRITISH STANDARD BS EN 1744-3:2002 Tests for chemical properties of aggregates Part 3: Preparation of eluates by leaching of aggregates The European Standard EN 1744-3:2002 has the status of a British Standard ICS 91.100.15 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 09:22:50 GMT+00:00
2、2006, Uncontrolled Copy, (c) BSI BS EN 1744-3:2002 This British Standard, having been prepared under the direction of the Building and Civil Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 9 August 2002 BSI 9 Augus
3、t 2002 ISBN 0 580 40248 7 National foreword This British Standard is the official English language version of EN 1744-3:2002, which is included in a package of new European Standards being prepared by CEN/TC 154 relating to aggregates. Although the English text versions of these European Standards w
4、ill be adopted as British Standards as they become available, the existing British Standards for aggregates will be retained, but only until such a time that the completed package of European Standards becomes available. The original group of British Standards will then be withdrawn and this will be
5、 noted in BSI Standards Update. The UK participation in its preparation was entrusted by Technical Committee B/502, Aggregates, to Subcommittee B/502/6, Test methods, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary
6、. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue
7、or of British Standards Online. 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 does not of itself confer immunity from legal obligations. aid enquirers to understand the te
8、xt; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front co
9、ver, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 09:22:50 GMT+0
10、0:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1744-3 July 2002 ICS 91.100.15 English version Tests for chemical properties of aggregates - Part 3: Preparation of eluates by leaching of aggregates Essais pour dterminer les proprits chimiques des granulats
11、- Partie 3: Prparation dluats par lixiviation des granulats Prfverfahren fr chemische Eigenschaften von Gesteinskrnungen - Teil 3: Herstellung von Eluaten durch Auslaugung von Gesteinskrnungen This European Standard was approved by CEN on 5 March 2002. CEN members are bound to comply with the CEN/CE
12、NELEC 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 Management Centre or to any C
13、EN 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 Management Centre has the same status as the official versions. CEN me
14、mbers are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NO
15、RMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2002 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1744-3:2002 E Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 09:22:50 GMT
16、+00:00 2006, Uncontrolled Copy, (c) BSI EN 1744-3:2002 (E) 2 Contents page Foreword3 1Scope 4 2Normative references.4 3Terms and definitions4 4Principle 5 5Reagents .6 6Apparatus6 7Sampling.6 8Preparation of test portions.6 9Procedure .7 10Test report.8 Bibliography9 Licensed Copy: sheffieldun sheff
17、ieldun, na, Mon Oct 30 09:22:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1744-3:2002 (E) 3 Foreword This document EN 1744-3:2002 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 natio
18、nal standard, either by publication of an identical text or by endorsement, at the latest by January 2003, and conflicting national standards shall be withdrawn at the latest by January 2003. This standard forms part of a series of tests for chemical properties of aggregates. Test methods for other
19、properties of aggregates will be covered by Parts of the following European Standards: EN 932Tests for general properties of aggregates EN 933Tests for geometrical properties of aggregates EN 1097Tests for mechanical and physical properties of aggregates EN 1367Tests for thermal and weathering prope
20、rties of aggregates EN 13179Tests 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 4:Water susceptibility of fillers for bituminous mixtures According to the CEN/CENELEC In
21、ternal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Sw
22、itzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 09:22:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1744-3:2002 (E) 4 1 Scope This European Standard specifies a method for the preparation of eluates, by leaching of aggregates, for subsequent investigation
23、of physical and chemical properties by existing standard methods for the purpose of compliance testing. It applies to unbound aggregates that have a particle size below 32 mm with or without size reduction (see clause 8). 2 Normative references This European Standard incorporates by dated or undated
24、 reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when in
25、corporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). 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
26、for reducing laboratory samples. EN 932-5, Tests for general properties of aggregates Part 5: Common equipment and calibration. EN 933-2, Tests for geometrical properties of aggregates Part 2: Determination of particle size distribution Test sieves, nominal size of apertures. EN 1097-5, Tests for me
27、chanical and physical properties of aggregates Part 5: Determination of the water content by drying in a ventilated oven. EN ISO 3696, Water for analytical laboratory use Specification and test methods (ISO 3696:1987). 3 Terms and definitions For the purposes of this European Standard, the following
28、 terms and definitions apply. 3.1 leachant liquid used in a laboratory leaching procedure 3.2 eluate solution remaining after the laboratory leaching procedure of a solid material in contact with a leachant 3.3 constant mass successive weighings after drying at least 1 h apart not differing by more
29、than 0,1 %. NOTEIn many cases constant mass can be achieved after a test portion has been dried for a pre-determined period in a specified oven at (110 5) C. Test laboratories can determine the time required to achieve constant mass for specific types and sizes of sample dependent upon the drying ca
30、pacity of the oven used. 3.4 laboratory sample sample intended for laboratory testing 3.5 test portion sample used as a whole in a single test Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 09:22:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1744-3:2002 (E) 5 4 Principle The aggregate to
31、be examined is placed on a screen insert and leached in a tank (see Figure 1). The liquid solid ratio is 10:1 (in mass proportion) and the leaching time is 24 h. The water is agitated by a motor driven dip stirrer. NOTEDuring the test procedure the leachant is agitated but the solid material is not.
32、 The method is based on the assumption that equilibrium or near-equilibrium is achieved between the liquid and solid phases during the test period. The solid residue is drawn off. The properties of the eluate are measured using methods developed for water analysis adapted to analysis of eluates. Dim
33、ensions in millimetres 300 1 2 3 4 5 6 7 + _ 10 400 + _ 10 NOTE Drawing not to scale. Key 1Motor driven dip stirrer 2Cover 3Tank 4Screen support 5Screen insert (mesh size 2 mm) 6Test portion 7Stop cock Figure 1 Example of tank with screen support Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 3
34、0 09:22:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1744-3:2002 (E) 6 5 Reagents 5.1 Distilled water, demineralized water, deionized water or water of an equivalent purity (5 pH 7,5) with a conductivity less than 0,5 mS/m conforming to grade 3 of EN ISO 3696. 5.2 0,1 mol/l nitric acid, analytic
35、al grade. 6 Apparatus 6.1 All apparatus, unless otherwise stated, shall conform to the general requirements of EN 932-5. 6.2 Balance, capable of weighing 2 kg with an accuracy of 0,1 g. 6.3 Thermometer, range 0 C to 50 C and accurate to 1 C for air and leachant temperature measurement. 6.4 Centrifug
36、e, operating at 3 000 m/s2 to 4 000 m/s2. 6.5 pH meter, readable to 0,1 pH units. 6.6 Electrical conductivity meter. 6.7 Filtering apparatus, either a vacuum filtering device (between 2,5 Pa to 4,0 Pa) or a high pressure filtration apparatus ( 500 kPa), capable of rinsing. 6.8 Pre-rinsed 0,45 m memb
37、rane filters, for filtration (rinsed with nitric acid, 0,1 mol/l (5.2) and water (5.1). 6.9 Tank for leaching. A one piece glass tank of external dimensions, height (400 10) mm and diameter (300 10) mm, with the following: a) cover; b) screen support, made of PTFE or glass (or stainless steel for th
38、e determination of organic parameters only or polypropylene for the determination of inorganic parameters only) with a screen mesh size 2 mm, dimensions of height (50 10) mm and diameter such that the support is (20 2) mm from the edge of the tank. The distance between the base of the screen and the
39、 base of the tank should be (50 5) mm. For lightweight aggregates, the test portion shall be covered by a second screen; c) motor driven dip stirrer with a stirring rod and propeller diameter (60 10) mm made of PTFE or PTFE- covered material that is inserted through a small hole in the cover of the
40、tank. 6.10 Crushing equipment, jaw crusher or a cutting device, for particles retained on the 32 mm sieve. 6.11 Sieves, of nominal sizes 16 mm and 32 mm conforming to EN 933-2, for sieving recrushed or cut particles. 7 Sampling Sampling shall be carried out in accordance with EN 932-1. 8 Preparation
41、 of test portions Aggregates shall be tested in the particle size distribution in which they are normally delivered. Particles retained on the 32 mm sieve shall be crushed and the fraction 16/32 mm sieved out. This material is returned to the sample under preparation in the percentage in which the f
42、raction larger than 32 mm was present in the original sample. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 09:22:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1744-3:2002 (E) 7 If the sample is wet it shall be air dried at room temperature ( 40 C) to constant mass to allow dividing and
43、screening. The water content of the sample used for leaching shall be determined on a parallel sample by drying at 110 C in accordance with EN 1097-5. Reduce the size of the laboratory sample in accordance with the procedures specified in EN 932-2 to give a test portion with a mass of about 2 kg and
44、 weigh the test portion to the nearest 0,1 g. For lightweight aggregates, the mass of the test portion shall be reduced in proportion to the density of the aggregate. It may also be necessary to increase the liquid/solid ratio in 9.2 in order that a lightweight aggregate test portion is covered with
45、 water. NOTE 1Contamination of the sample can occur to an extent, which affects the leaching of some constituents of concern, for example from tungsten carbide equipment or stainless steel apparatus. Care should be taken to ensure that such contamination of samples is minimised. NOTE 2In the case of
46、 lightweight aggregates with a bulk density less than 200 kg/m3 (0,2 Mg/m3), the mass of the sample should be reduced to 500 g. 9 Procedure 9.1 Testing conditions The leaching shall be carried out at room temperature (20 C to 25 C) 9.2 Test procedure After filling the tank with a mass of leachant eq
47、ual to 10 times the dry mass of the test portion, place the appropriate screen into the tank in such a way that it is completely covered with water. Slowly distribute the test portion, which is to undergo leaching, uniformly over the screen so that as much air as possible is removed from the test po
48、rtion. When the test portion is arranged on the screen, the water cover shall be at least at 20 mm. Then lower the screen support to the bottom of the tank. Place the screen insert in the leaching tank in such a way that a uniform distance from the walls of the vessel is maintained. Cover the leachi
49、ng tank. Insert the motor-driven dip stirrer through the small hole in the cover of the tank and fix it in such a way that the propeller is closely above the test portion. Set the motor-driven dip stirrer to a rotational speed of (500 20) min-1. After 24 h 10 min switch off the stirrer and draw off the required quantity of eluate, as specified in 9.3, for analysis. NOTEIn the case of lightweight aggregates with a bulk density l