1、BRITISH STANDARD BS EN 772-2:1998 Incorporating Amendment No. 1 Methods of test for masonry units Part 2: Determination of percentage area of voids in masonry units (by paper indentation) The European Standard EN 772-2:1998, with the incorporation of amendment A1:2005, has the status of a British St
2、andard ICS 91.100.20 BS EN 772-2:1998 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 15 December 1998 BSI 12 January 2006 ISBN 0 580 30698 4 National foreword This British Standard is the official English language version of EN 772-2:1998, i
3、ncluding amendment A1:2005. It is included in a package of standards declared by CEN/TC 125 and is intended that it will partially supersede BS 6073-1:1981, Specification for precast concrete masonry units which will be withdrawn on 30 September 2000 if all the European Standards included in the pac
4、kage are available. The start and finish of text introduced or altered by CEN amendment is indicated in the text by tags !“. Tags indicating changes to CEN text carry the number of the amendment. For example, text altered by CEN amendment A1 is indicated by !“. The UK participation in its preparatio
5、n was entrusted by Technical Committee B/519, Masonry and associated testing, to Subcommittee B/519/1, Masonry units, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which imple
6、ment 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 or of British Standards Online. This publication doe
7、s 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 text; present to the responsible international/Europea
8、n committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor 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 t
9、o 4, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 15684 12 January 2006 Title revised, also see national forewordCEN European Committee for Standardiz
10、ation Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 772-2:1998 + A1: :2005 E EUROPEAN STANDARD EN 7
11、72-2 NORME EUROPE ENNE EUROPA ISCHE NORM August 1998 ICS 91.100.20 Descriptors: construction, masonry units, tests, determination, voids, percentage area, aggregate concrete English version Methods of test for masonry units Part 2: Determination of percentage area of voids in masonry units (by paper
12、 indentation) Me thodes dessai des e le ments de maonnerie Partie 2: De termination du pourcentage de vides dans les e le ments de maonnerie en be ton (par empreinte sur papier) Pru fverfahren fu r Mauersteine Teil 2: Bestimmung des prozentualen Lochanteils in Mauersteinen aus Beton (mittels Papiere
13、indruck) This European Standard was approved by CEN on 2 July 1998, amendment A1 was approved by CEN on 29 December 2005. 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 witho
14、ut any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language ma
15、de by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. +A1 February 2005(includes amendment A1:2005) (inclut lamendement A1:2005) (enthltnderung A1:2005) CEN members are the national stand
16、ards 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, Switzerland and United Kingdom. Page 2 EN 772
17、-2:1998 Foreword This European Standard has been prepared 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, at the latest by Februa
18、ry 1999, and conflicting national standards shall be withdrawn at the latest by September 2000. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark,
19、 Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Symbols 3 5 Materials 3 6 Apparatus 3 7 Preparation of specimens 3 8 T
20、est procedure 3 9 Expression of results 4 10 Test report 4 Foreword to amendment A1 This document (EN 771-2:1998/A1:2005) has been prepared by Technical Committee CEN/TC 125 Masonry, the Secretariat of which is held by BSI. This Amendment to the European Standard EN 772-2:1998 shall be given the sta
21、tus of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2005, and conflicting national standards shall be withdrawn at the latest by August 2005. According to the CEN/CENELEC Internal Regulations,the national standards organizations of the fo
22、llowing countries are bound to implement this European Standard: 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, Sw
23、eden, Switzerland and United Kingdom. Page 3 EN 772-2:1998 1) The test may be arranged so that the percentage area of voids in opposing faces of the masonry unit are tested simultaneously or faces tested singly. 1 Scope This European Standard specifies a method of determining the percentage area of
24、voids in masonry units. 2 Normative references This European Standard incorporates by dated or undated 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
25、 amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. 3 Principle After preparation of the specimens thick pieces of paper are
26、impressed on the test surfaces 1) of the masonry units and the indentation measured to give the percentage area of voids. 4 Symbols A v is the total cross-sectional area of voids (mm 2 ). A u is the cross-sectional area of masonry unit (mm 2 ). M pv is the mass of paper cut to the shape of the void
27、(g). M pu is the mass of paper cut to the shape of the masonry unit (g). 5 Materials Thick, stiff sheets of paper, the dimensions of each piece of paper exceeding the dimensions of the masonry unit by at least 20mm in both directions. 6 Apparatus 6.1 Compression testing machine . 6.2 Planimeter . 6.
28、3 W eighing instrument, capable of weighing to an accuracy of 0,1g. 7 Preparation of specimens 7.1 Sampling The method of sampling shall be in accordance with . The minimum number of specimens shall be six, but a larger minimum number may be specified in the product specification, in which case that
29、 larger number shall be used. 7.2 Surface treatment Remove any roughness on the test face(s) of the masonry unit. 8 Test procedure 8.1 Obtaining the indentations Place one sheet of paper on the bottom platen of a compression testing machine (6.1). Place the masonry unit on the paper, with the voids
30、running vertically, and then, if required to test two faces simultaneously, place a second sheet of paper on the top face of the masonry unit. Apply a load of approximately 3 kN. Mark the outline on both sheets of paper of the indentations that have been made. 8.2 Measurement 8.2.1 General Measure t
31、he areas of the cross-section of the voids and the masonry unit in accordance with 8.2.2 or the weights of the corresponding areas of paper in accordance with 8.2.3. 8.2.2 Measurement by geometry For each sheet of paper determine the total cross-sectional area of the voids A v and of the masonry uni
32、t A u and express them to the nearest 10mm 2 using the planimeter (6.2). 8.2.3 Measurement by weight For each sheet of paper cut out the area representing the area of the masonry unit and weigh it to the nearest 0,1g. Record the weight M pu . From the sheet of paper representing the area of the maso
33、nry unit cut out the areas representing the voids and weigh these to the nearest 0,2g. Record the weight M pv . !Text deleted “ !the relevant part of EN 771 “! EN 771-1, Specification for masonry units Part 1: Clay masonry units EN 771-2, Specification for masonry units Part 2: Calcium silicate maso
34、nry units EN 771-3, Specification for masonry units Part 3: Aggregate concrete masonry units (dense and lightweight 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 u
35、nits “ Page 4 EN 772-2:1998 9 Expression of results Determine the percentage area of voids by geometry, 3 100 (1) A v A u or by weight, 3 100 (2) M pv M pu for the paper applied to each bed face of the masonry unit. Determine the mean percentage area of voids, if required, to the nearest 1 %. 10 Tes
36、t 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 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 re
37、ference to e) the number of specimens in the sample; f) a reference to the method used (i.e. by geometry or by weight); g) the percentage area of voids of each specimen and the mean value, if required, to the nearest 1 %; h) remarks, if any.!the relevant part of EN 771 “; blankBS EN 772-2:1998 BSI 3
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