1、BSI Standards PublicationBS EN 13892-3:2014Methods of test for screedmaterialsPart 3: Determination of wear resistance BhmeBS EN 13892-3:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 13892-3:2014. It supersedes BS EN 13892-3:2004 which is withdrawn.The UK
2、 participation in its preparation was entrusted to Technical Committee CB/300, Screeds and in-situ floorings.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. User
3、s are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 85960 1 ICS 91.100.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority o
4、f the Standards Policy and Strategy Committee on 31 December 2014.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13892-3 December 2014 ICS 91.100.10 Supersedes EN 13892-3:2004English Version Methods of test for screed ma
5、terials - Part 3: Determination of wear resistance - Bhme Mthodes dessai des matriaux pour chapes - Partie 3: Dtermination de la rsistance lusure Bhme Prfverfahren fr Estrichmrtel und Estrichmassen - Teil 3: Bestimmung des Verschleiwiderstandes nach Bhme This European Standard was approved by CEN on
6、 16 November 2014. 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 m
7、ay be obtained on application to the CEN-CENELEC Management Centre 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
8、 to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Icelan
9、d, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Managem
10、ent Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13892-3:2014 EBS EN 13892-3:2014EN 13892-3:2014 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Principle 4 4 Sy
11、mbols and abbreviations 4 5 Apparatus .4 6 Abrasive material .7 7 Preparation of specimens .7 8 Testing 8 8.1 General 8 8.2 Determination of density .8 8.3 Procedure .8 9 Expression of results 8 10 Test report 8 Bibliography . 10 BS EN 13892-3:2014EN 13892-3:2014 (E) 3 Foreword This document (EN 138
12、92-3:2014) has been prepared by Technical Committee CEN/TC 303 “Floor screeds and screed materials”, the secretariat of which is held by UNI. 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 June 2
13、015 and conflicting national standards shall be withdrawn at the latest by June 2015. 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 responsible for identifying any or all such patent rights.
14、This document supersedes EN 13892-3:2004. In comparison with the previous edition, changes have been made in: Clause 6, 2ndparagraph and Table 2; Clause 7, 2ndparagraph. EN 13892, Methods of test for screed materials, is divided in the following parts: Part 1: Sampling, making and curing specimens f
15、or test; Part 2: Determination of flexural and compressive strength; Part 3: Determination of wear resistance Bhme the present document; Part 4: Determination of wear resistance-BCA; Part 5: Determination of wear resistance to rolling wheel of screed material for wearing layer; Part 6: Determination
16、 of surface hardness; Part 7: Determination of wear resistance to rolling wheel of screed material with floor coverings; Part 8: Determination of bond strength. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement t
17、his European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slova
18、kia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 13892-3:2014EN 13892-3:2014 (E) 4 1 Scope This European Standard specifies a method for determining the wear resistance of moulded specimens made from cementitious screed material, primarily for hard aggregate wearing sc
19、reed materials or optionally for other screed materials. The method is also suitable for specimens cut from floor screed. This method is unsuitable for synthetic resin screed materials. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document a
20、nd are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 459-2, Building lime - Part 2: Test methods EN 13813, Screed material and floor screeds - Scree
21、d material - Properties and requirements EN 13892-1, Methods of test for screed materials - Part 1: Sampling, making and curing specimens for test ISO 565, Test sieves - Metal wire cloth, perforated metal plate and electroformed sheet - Nominal sizes of openings 3 Principle Cast specimens are placed
22、 on the Bhme abrader, on the test track of which standard abrasive is strewn, the disk then being rotated and the specimens subjected to an abrasive load of 294 N for a given number of cycles. 4 Symbols and abbreviations A = V is the wear resistance-Bhme in cm3per 50 cm2and the loss in volume after
23、16 cycles l = l0 l16mis the mean reduction in mm after 16 cycles l0 is the mean thickness of the specimen in mm from the measurements made at all nine measuring points prior to testing l16mis the mean thickness of the specimen in mm from the measurements made at all nine measuring points after compl
24、etion of the test m is the reduction in mass in g after 16 cycles Ris the density of the specimen in g/cm3or, in the case of multi-layer specimens, the density of the wearing layer 5 Apparatus The Bhme abrader as shown in Figure 1 consists of a rotating table with a defined test track to receive the
25、 abrasive, a specimen holder and a loading device. The rotating table shall have a diameter of approximately 750 mm and be flat and positioned horizontally. When loaded, its speed shall be (30 1) r/min. BS EN 13892-3:2014EN 13892-3:2014 (E) 5 The table shall be provided with a revolution counter and
26、 a device that switches off the rotating table automatically after 22 revolutions. The test track shall be annular, with an inside radius of approximately 120 mm and an outside radius of approximately 320 mm to give a width of (200 5) mm, and be replaceable. The track shall be made of cast iron with
27、 a perlitic structure, a phosphorus content not exceeding 0,35 % and a carbon content of more than 3 %. The track shall have a Brinell hardness of 190 HB to 220 HB 2,5/187,5 determined as the mean from measurements taken at not less than 10 points along the edge of the track. The face of the track i
28、n contact with the specimen shall be fine finished (surface roughness of 6 m to16 m). The track should be designed so as to permit both sides to be used. The track surface is subject to wear in service; the resulting reduction in thickness shall not exceed 0,3 mm and any grooves not be deeper than 0
29、,2 mm. If these values are exceeded, the track shall be replaced or refinished. When the track has been refinished three times, its hardness shall be determined anew. The specimen holder shall consist of a U frame approximately 40 mm thick, with a clear distance of (5 1) mm from the test track. The
30、frame shall be positioned so that the centreline distance between specimen and rotating table is 220 mm and the angle bead of the specimen holder, which supports the specimen, is located at a distance of (4 1) mm above the rotating table. The mounting of the specimen holder shall ensure that, during
31、 testing, no vibration occurs. The loading device shall consist of a lever of two arms of different length, a loading weight and a counterweight, the lever being pivoted with as little friction as possible and positioned almost horizontally during the test. The system shall be designed to ensure tha
32、t the load is transferred vertically via the plunger to the centre of the specimen. The self-weight of the lever is balanced by the counter-weight and the scale arm to receive the loading weight. The force acting on the specimen results from the loading weight multiplied by the leverage ratio, the m
33、ass of the weight being selected to produce a test force of (294 3) N (corresponding to about 0,06 N/mm2compressive stress), which shall be verified by calculation. To establish the reduction in thickness of the specimen it shall be placed on a measuring table. A template (see Figure 2) shall be pla
34、ced over the specimen in a marked orientation, to identify the nine measuring points. A dial gauge rigidly attached to the measuring table is used to measure, to an accuracy of 0,01 mm, the vertical position at any measuring point. The dial gauge is fitted with a plunger with a spherical end-bearing
35、 of 3 mm diameter. BS EN 13892-3:2014EN 13892-3:2014 (E) 6 Dimensions in millimetres Key 1 counterweight 2 specimen 3 specimen holder 4 rotating disk 5 test track 6 loading weight a Section A-A (enlarged) Figure 1 Principle of Bhme disk abrader Dimensions in millimetres Figure 2 Template for identif
36、ying measuring points BS EN 13892-3:2014EN 13892-3:2014 (E) 7 6 Abrasive material The standard abrasive material used shall be an artificial corundum1)designed to produce an abrasive wear of 1,10 mm to 1,30 mm when testing standard granite2)specimens and of 4,20 mm to 5,10 mm when testing standard l
37、imestone2)specimens. The tolerances of the chemical composition of the abrasive material is given in Table 1. Conformance to these requirements, the homogeneity of the material and the uniformity of bulk density and grading of the abrasive shall be checked before use. Table 1 Standard requirements o
38、f the chemical composition Constituent Content mass percentage corundum (crystallized aluminium oxide Al2O3) 99,3 The loose density of the standard abrasive grit shall be between (1,48 0,1) kg/dm3. The loose density is determined according to the test method described in EN 459-2 whereby the filling
39、 container of the apparatus is to be filled with 2 kg of the grit. The mass percentage of material on each sieve shall correspond to the particle size distribution of Table 2. Table 2 Sieve analysis Test sieve according to ISO 565 Percentage passing by mass 63 5 125 90 7 Preparation of specimens The
40、 wear resistance Bhme is measured on the top surface as cast of 3 specimens made in accordance with EN 13892-1 or cut from floor screed. Cubes with edge length of (71 1,5) mm shall be used as specimens. Alternatively square blocks, of the same edge length, but a minimum thickness of 30 mm including
41、any support slab may be used. The test specimen shall be dried at (110 5) C until constant mass. In order to avoid the influence of the preparation each specimen shall undergo four cycles before starting the test. 1) Information on source of supply of standard abrasives and on impartial testing labo
42、ratories can be obtained from Materialprfungsamt Nordrhein-Westfalen, Marsbruchstrae 186, D-44287 Dortmund, Deutschland. 2) The standard material is stocked by the laboratory responsible for the inspection of standard abrasives. BS EN 13892-3:2014EN 13892-3:2014 (E) 8 The contact face, that is the f
43、ace to be tested and the bottom face of the specimen shall be parallel and flat. For determining the reduction in thickness the bottom face shall, if appropriate, be ground parallel or otherwise machined so as to be parallel. 8 Testing 8.1 General The wear resistance Bhme shall be determined as loss
44、 in volume, calculated from changes in mass. In the case of multi-layer specimen the wear resistance is determined as a reduction in thickness. In case of the chosen determination, one of the following procedures shall be undertaken. 8.2 Determination of density To determine the loss in volume, prio
45、r to testing, the density of the specimen, R, shall be determined by measurements, to the nearest 0,1 mm, and by weighing, to the nearest 0,1 g. 8.3 Procedure Prior to testing each specimen shall be measured by mass or by thickness, as appropriate. For mass each specimen shall be weighed to an accur
46、acy of 0,1 g. For reduction in thickness each specimen shall be placed contact face up on a measuring table, and readings taken from the dial gauge at a total of nine measuring points arranged as shown in Figure 2, the results being given to the nearest 0,01 mm. Each specimen shall undergo testing f
47、or 16 cycles, each consisting of 22 revolutions. 20 g of standard abrasive shall be strewn evenly on the test track and the specimen, clamped into the holder and with the test contact face facing the track, loaded centrally with (294 3) N. The rotating table shall then be rotated, taking care that t
48、he abrasive on the track remains evenly distributed over an area traversed by the specimen. After each cycle, both rotating table and contact face shall be cleaned, and the specimen turned progressively through 90 and new abrasive strewn on the track. After each cycle the contact area shall be inspe
49、cted visually and any significant changes noted. After completion of the test and careful cleaning, each specimen shall be remeasured, as appropriate. Measurements after every 4 cycles may provide useful information on the rate of wear. 9 Expression of results The wear resistance Bhme A after 16 cycles shall be determined as the loss in specimen volume V, using Formula (1). 5= = =RmAV lin cm3per 50 cm2(1) 10 Test report The test report shall include the following information: a) number,
