1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 1744-7:2012Tests for chemical properties ofaggregatesPart 7: Determination of loss of ignitionof Municipal Incinerator Bottom AshAggregate (MIBA Aggregate)BS EN 1744-7:2012
2、 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 1744-7:2012.The UK participation in its preparation was entrusted to TechnicalCommittee B/502/6, Test methods.A list of organizations represented on this committee can beobtained on request to its secretary.This p
3、ublication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 71034 6ICS 91.100.15Compliance with a British Standard cannot confer immuni
4、ty fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2012.Amendments issued since publicationDate Text affectedBS EN 1744-7:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1744-7 February 2012 ICS 91.100.1
5、5 English Version Tests for chemical properties of aggregates - Part 7: Determination of loss of ignition of Municipal Incinerator Bottom Ash Aggregate (MIBA Aggregate) Essais pour dterminer les caractristiques chimiques des granulats - Partie 7: Dtermination de la perte au feu des mchefers dincinra
6、tion dordures mnagres (MIOM) Prfverfahren fr chemische Eigenschaften von Gesteinskrnungen - Teil 7: Bestimmung des Glhverlustesvon Hausmllverbrennungsasche (HMV-Asche) This European Standard was approved by CEN on 7 January 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulati
7、ons 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 CEN-CENELEC Management Centre or to any CEN member.
8、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 CEN-CENELEC Management Centre has the same status as the official versions. CEN m
9、embers are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spa
10、in, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN na
11、tional Members. Ref. No. EN 1744-7:2012: EBS EN 1744-7:2012EN 1744-7:2012 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Principle 45 Apparatus .56 Sampling and preparation of test specimens .57 Procedure .68 Calculation and expression of results .69 Test
12、report 7BS EN 1744-7:2012EN 1744-7:2012 (E) 3 Foreword This document (EN 1744-7:2012) 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 identi
13、cal text or by endorsement, at the latest by August 2012, and conflicting national standards shall be withdrawn at the latest by August 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held res
14、ponsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This European Standard forms part of a series of tests for chemical properties of aggregates. Test methods for othe
15、r properties of aggregates will be covered by the following European Standards: EN 932 (all parts), Tests for general properties of aggregates; EN 933 (all parts), Tests for geometrical properties of aggregates; EN 1097 (all parts), Tests for mechanical and physical properties of aggregates; EN 1367
16、 (all parts), Tests for thermal and weathering properties of aggregates. The other parts of EN 1744, Tests for chemical properties of aggregates, are: Part 1: Chemical analysis; Part 3: Preparation of eluates by leaching of aggregates; Part 4: Determination of water susceptibility of fillers for bit
17、uminous mixtures; Part 5: Determination of acid soluble chloride salts; Part 6: Determination of the influence of recycled aggregate extract on the initial setting time of cement. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are b
18、ound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, 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
19、, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1744-7:2012EN 1744-7:2012 (E) 4 1 Scope This European Standard specifies the test method used for the determination of the loss on ignition (LOI) of aggregates (MIBA Aggregates) produced by processing Municipal Incinerator Bottom Ash (MIBA)
20、. This European Standard describes the reference method for LOI of MIBA Aggregates For the purpose of type testing and in case of dispute only the reference method should be used. For other purposes, in particular factory production control, other methods may be used provided that an appropriate wor
21、king relationship with the reference method has been established. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references,
22、the latest edition of the referenced document (including any amendments) applies. 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 propert
23、ies of aggregates Part 5: Common equipment and calibration 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 test specimen sample used in a single determination when a test method requires more than one determination of a property 3.2 laborator
24、y sample sample intended for laboratory testing 3.3 constant mass mass determined by successive weighings performed at least 1 h apart not differing by more than 0,1% NOTE 1 to entry In many cases constant mass can be achieved after a test portion has been dried for a pre-determined period in a spec
25、ified 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 capacity of the oven used. 3.4 MIBA Aggregate aggregate produced by processing Municipal Incinerator Bottom Ash 4 Principle The proport
26、ion of unburned residues in MIBA aggregate is determined by measuring the loss on ignition in an oxidizing atmosphere. BS EN 1744-7:2012EN 1744-7:2012 (E) 5 The loss on ignition is expressed as the percentage of the dry mass of the initial sample after heating for 4 h at (480 25) C. NOTE Because of
27、hydration by weathering, the LOI value of MIBA Aggregates may change during storage. 5 Apparatus Unless otherwise stated, all apparatus shall conform to the general requirements of EN 932-5. 5.1 Well ventilated drying oven, capable of being controlled to maintain a constant temperature of (110 5) C,
28、 equipped with a heat resistant tray made of non-corrodible material. 5.2 Electric muffle furnace capable of being controlled to maintain a constant temperature in the range (480 25) C. 5.3 Container and cover grid with 2 mm size apertures, suitable for use at a temperature of up to 550 C. NOTE Porc
29、elain, quartz glass or platinum are appropriate materials for containers. 5.4 Crushing and grinding equipment to reduce aggregates to sizes that pass a 4 mm size test sieve while producing a minimum of fines. 5.5 Balance, capable of weighing up to 10 kg, readable to the nearest 1 g. 5.6 Balance, cap
30、able of weighing up to 300 g, readable to the nearest 0,01 g. 5.7 Test sieve, 4 mm size. 5.8 Desiccator with desiccant. 6 Sampling and preparation of test specimens 6.1 Laboratory sample The laboratory sample shall be taken in accordance with the procedures specified in EN 932-1. The mass of the lab
31、oratory sample shall be not less than the mass specified in Table 1 appropriate to the upper (D) sieve size of the aggregate. Dry the sample to constant mass, at a temperature of (110 5) C. NOTE Drying at a higher temperature will oxidise any sulfides. Table 1 Minimum mass of laboratory sample Upper
32、 (D) sieve size of the aggregate, mm Minimum mass of laboratory sample, kg 63 45 31,5 22,4 or less 50 35 15 5 Record the laboratory sample mass. BS EN 1744-7:2012EN 1744-7:2012 (E) 6 6.2 Test specimens Stepwise mix, crush and reduce the laboratory sample using the procedures specified in EN 932-2 to
33、 produce a sub-sample of approximately 400 g of aggregate that passes the 4 mm size test sieve. Reduce this sub-sample further to produce two test specimens, each with a mass between 50 g and 100 g. Retain the rest of the sub-sample (8.2). 7 Procedure Pre-ignite the container in the muffle furnace a
34、t (480 25) C. Allow the container to cool in the desiccator and weigh (Mc) it Place the first test specimen in the container. The thickness of the layer of particles shall be less than 15 mm. Weigh the test specimen in the container and record the mass, M0, to the nearest 0,01 g Cover the container
35、with the cover grid. NOTE The grid prevents the loss of any fragments from particles that may break down during heating. Place the container in the muffle furnace controlled at (480 25) C. Leave the container in the furnace for at least 240 min. Remove the container from the furnace and place it in
36、the desiccator. Allow it to cool to room temperature. Weigh the ignited test specimen in the container, M1, to the nearest 0,01 g. Repeat for the second test specimen. 8 Calculation and expression of results 8.1 Calculation For each test specimen, calculate the loss on ignition using the following f
37、ormula: 100010=cM-MM-MX (1) Where X is the loss on ignition of the test specimen, (in %); M0is the weight of the test specimen with the container; M1 is the weight of the ignited test specimen with the container; Mcis the weight of the pre-ignited container. Record each result as X1and X2, to the ne
38、arest 0,01%. Calculate the mean value of the two results using the following formula: 221XXXM+= (2) BS EN 1744-7:2012EN 1744-7:2012 (E) 7 Where XMis the mean loss on ignition, (in %). Record the result as XM, to the nearest 0,1 %. 8.2 Precision check Check the range of the individual values for loss
39、 on ignition using the following criteria: If XM 3,0 %, the difference between X1and X2shall be 0,6 % If XM 3,0 %, the difference between X1and X2shall be 1,0 % If the precision check criteria are not complied with, repeat the test procedure using two more test portions taken from the crushed and si
40、eved sub-sample (6.2). Record each result as X3and X4, to the nearest 0,01 %. Calculate the mean value of the four results using the following formula: 44321XXXXXM+(3) Where XM is the mean loss on ignition, (in %). Record the result as XM, to the nearest 0,1 %. 9 Test report The test report shall co
41、nfirm that the loss on ignition test was carried out in accordance with this European Standard and include the following information: a) source of sample; b) designation of the sample; c) aggregate size of the sample; d) mass of the laboratory sample; e) individual values of loss on ignition; f) mea
42、n value of loss on ignition; g) date of test; h) reference to this test standards (EN 1744-7); i) identification of the testing laboratory. This page deliberately left blankThis page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other sta
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