1、DEUTSCHE NORM No part of this standard may be reproduced without the prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).May 2005DIN EN 772-20English price group 5 www.din.de ww
2、w.beuth.de08.05 9648366Document comprises 6 pages.Methods of test for masonry unitsPart 20: Determination of atness of faces of masonry units(includes Amendment A1:2005)English version of DIN EN 772-20:2000 + A1:2005Prfverfahren fr Mauersteine Teil 20: Bestimmung der Ebenheit von Mauersteinen (enthl
3、t nderung A1:2005)A comma is used as the decimal marker.National forewordThis standard has been prepared by CEN/TC 125 Masonry (Secretariat: United Kingdom).The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee),
4、Technical Committee 06.01.00 Mauerwerksbau.This European Standard is part of a series of standards specifying methods used to check compliance of masonry units with the requirements specied in the relevant product standard.AmendmentsThis standard differs from the September 2000 edition in that it ha
5、s been revised in form and substance.Previous editionDIN EN 772-20: 2000-09.ICS 91.100.15; 91.100.30 Supersedes September 2000 edition.!,cve“English versionICS 91.100.30 Supersedes EN 772-20:2000.Management Centre: 36, rue de Stassart, B-1050 BrusselsEuropean Committee for StandardizationComit Europ
6、en de NormalisationEuropisches Komitee fr Normung 2005. CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national members.Ref. No. EN 772-20:2000 + A1:2005 EMethods of test for masonry unitsPart 20: Determination of atness of faces of masonry units(includes Amen
7、dment A1:2005)Mthodes dessai des lments de maonnerie Partie 20: Dtermina-tion de la planit des lments de maonnerie (amendement A1:2005 inclus)Prfverfahren fr Mauersteine Teil 20: Bestimmung der Ebenheit von Mauersteinen (enthlt nderung A1:2005)This European Standard was approved by CEN on 2000-02-17
8、 and Amendment A1 on 2004-12-29.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
9、 standards may be obtained on application to the Management Centre or to any CEN member.The European Standards exist in three ofcial 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 notied to th
10、e Management Centre has the same status as the ofcial versions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, N
11、orway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland, and the United Kingdom.EN 772-20March 2000+ A1February 2005Page 2 EN 772-20:2000 + A1:2005ContentsPageForeword to EN 772-20:2000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Foreword to EN 772-20
12、:2000/A1:2005 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
13、Apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Preparation of specimens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14、 . . . . . . . . . . . . . 46 Calculation and expression of results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Test report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Foreword to EN 772-20:2000This European Standard has been p
15、repared by Technical Committee CEN/TC 125 Masonry, 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, by February 1999 at the latest, and conicting national standards shall be
16、withdrawn by September 2000 at the latest.In accordance with the CEN/CENELEC Internal Regulations, the national standards organizations of the follow-ing countries are bound to implement this European Standard:Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland,
17、Ireland, Italy, Lux-embourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom.Foreword to EN 772-20:2000/A1:2005This amendment to EN 772-20:2000 has been prepared by Technical Committee CEN/TC 125 Masonry, the Secretariat of which is held by BSI.This amendment sh
18、all be given the status of a national standard, either by publication of an identical text or by endorsement, and conicting national standards withdrawn, by August 2005 at the latest.In accordance with the CEN/CENELEC Internal Regulations, the national standards organizations of the follow-ing count
19、ries are bound to implement this European Standard:Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Slo-vakia, Slovenia, Spain, Sweden,
20、Switzerland, and the United Kingdom.Page 3 EN 772-20:2000 + A1:20051 Scope This European Standard specifies a method for determining the flatness of surfaces of masonry units. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications
21、. 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 incorporated in it by amendment or revision. For
22、 undated references the latest edition of the publication referred to applies. EN 771-1 Specification for masonry units Part 1: Clay masonry units EN 771-2 Specification for masonry units Part 2: Calcium silicate masonry units EN 771-3 Specification for masonry units - Part 3: Aggregate concrete mas
23、onry units (dense and light-weight aggregates) EN 771-4 Specification for masonry units Part 4: Autoclaved aerated concrete masonry units EN 771-5 Specification for masonry units - Part 5: Manufactured stone masonry units prEN 771-6 Specification for masonry units - Part 6: Natural stone masonry uni
24、ts 3 Apparatus 3.1 Graduated straight edge which is longer than the diagonals of the long faces of the unit being tested.3.2 Set of feeler gauges capable of measuring with an accuracy to 0,05 mm. 4 Preparation of specimens 4.1 Sampling The method of sampling shall be stated in the test report. The m
25、inimum number of specimens shall be six except in the case of the determination of flatness of bed face where it shall be three, but a larger minimum number may be specified in the product specification, in which case that larger number shall be used. Page 4 EN 772-20:2000 + A1:20054.2 Surface treat
26、mentRemove any superfluous material adhering to the unit as a result of the manufacturing process before measuring. 5 Procedure 5.1 Unit surfaceEnsure that the masonry unit is positioned in a stable manner prior to measurement. For each surface specified as being plane follow the procedures in 5.2 a
27、nd 5.3. For units specified as being suitable for thin layer masonry carry out the procedure in 5.3 on each bed face. 5.2 Measurement of diagonals For each surface specified as plane, measure the length of the two diagonals with the graduated straight edge (3.1) to the nearest 0,5 mm.5.3 Measurement
28、 of deviation Place the straight edge across each diagonal in turn and use the feeler gauge (3.2) to measure the distance from the surface of the masonry unit to the straight edge. Where the surface of the masonry unit is concave, measure the greatest distance from the surface of the straight edge t
29、o the nearest 0,05 mm. Where the surface of the masonry unit is convex, place the straight edge on it such that the greatest distances to the surface on either side of the point of contact are approximately equal. Measure them both to the nearest 0,05 mm. 6 Calculation and expression of results 6.1
30、Calculation of results In the case of concave faces calculate the mean deviation from flatness as the mean of the maximum distances of the face of the masonry unit from the straight edge on each diagonal. In the case of convex faces calculate the mean of the maximum distances of the face of the maso
31、nry unit from the straight edge for each diagonal and then calculate the mean deviation from flatness as the mean of these two results. For each surface specified as being plane calculate the mean length of the diagonal. 6.2 Expression of results 6.2.1 Flatness of surfaces specified as being planeEx
32、press the mean length of the diagonal to the nearest millimetre. Express the mean maximum deviation from flatness to the nearest 0,1 mm. Page 5 EN 772-20:2000 + A1:20056.2.2 Flatness of bed faces Express the maximum deviation from flatness to the nearest 0,1 mm. Express the mean maximum deviation fr
33、om flatness to the nearest 0,1 mm. 7 Test report The test report shall contain the following information: a) the number, title and date of issue of this European Standard; b) the name of the organisation that carried out the sampling and the method used ; c) the date of testing; d) the type, origin
34、and designation of the masonry unit by reference to the relevant part of EN 771;e) the number of specimens in the sample; f) the date of receipt of the specimens in the testing laboratory; g) for each surface specified as being plane, the length of the individual diagonals of each face and the mean
35、length of the diagonals to the nearest millimetre; h) for each surface specified as being plane the maximum distance from the surface of the masonry unit to the straight edge for each diagonal and the mean deviation to the nearest 0,1 mm; i) for each bed face of units specified as being suitable for
36、 thin layer masonry the maximum distance from the surface of the masonry unit to the straight edge for each diagonal. The flatness of the bed faces is taken as the largest individual maximum distance from the sample of units expressed to the nearest 0,1 mm; j) whether the surface of the masonry unit is concave or convex or any other configuration; k) remarks, if any.
