1、BRITISH STANDARD BS EN 772-20:2000 Incorporating Amendment No. 1 Methods of test for masonry units Part 20: Determination of flatness of faces of masonry units This European Standard EN 772-20:2000, incorporating amendment A1:2005, has the status of a British Standard ICS 91.080.30; 91.100.15 BS EN
2、772-20:2000 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 15 July 2000 BSI 16 January 2006 ISBN 0 580 34980 2 National foreword This British Standard is the official English language version of EN 772-20:2000, including amendment A1:2005, w
3、hich is included in a package of new European Standards being prepared by CEN/TC 125 relating to aggregate concrete and manufactured stone and natural stone masonry units. No British Standard is superseded. The start and finish of text introduced or altered by CEN amendment is indicated in the text
4、by tags !“.Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by CEN amendment A1 is indicated by !“. The UK participation in its preparation was entrusted by Technical Committee B/519, Masonry and associated tests, to Subcommittee B/519/1, Masonry u
5、nits, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue un
6、der the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue 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 ap
7、plication. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; mon
8、itor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates whe
9、n the document was last issued. Amendments issued since publication Amd. No. Date Comments 15683 16 January 2006 See national foreword(8523($1 67$1$5 1250( (8523e(11( (8523b,6 amendment A1 was approved by CEN on 29 December 2004. Ref. No. EN 772-20:2000 +A1:2005 ECEN members are bound to comply with
10、 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 may be obtained on application to the Management Centre
11、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 to the Management Centre has the same status as the official versi
12、ons. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switze
13、rland and United Kingdom. (includes amendment A1: 2005) 3DJH (1 b) the name of the organization that carried out the sampling and the method used; c) the date of testing; d) the type, origin and designation of the masonry unit by reference to !the relevant part of EN 771; “ e) the number of specimen
14、s 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 length of the diagonals to the nearest millimetre; !h) for each surface specified as being plane the ma
15、ximum 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 unsuitable for thin layer masonry the maximum distance from the surface of the masonry unit to the straight edge f
16、or 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. “ blankBS EN 772-20:2000 BSI 3
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