1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 772-3:1998 The Euro
2、pean Standard EN 772-3:1998 has the status of a British Standard ICS 91.100.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Methods of test for masonry units Part 3: Determination of net volume and percentage of voids of clay masonry units by hydrostatic weighingBS EN 772-3
3、:1998 This British Standard, having been prepared under the direction of the Sector Committee for Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 December 1998 BSI 1998 ISBN 0 580 30695 X Amendments issued since publication Amd
4、. No. Date Text affected National foreword This British Standard is the English language version of EN 772-3:1998. It is included in a package of standards declared by CEN/TC 125 and is intended that it will partially supersede BS 3921:1985 Specification for clay bricks which will be withdrawn on 30
5、 September 2000 if all the European Standards included in the package are available. The UK participation in its preparation was entrusted by Technical Committee B/519, Masonry and associated testing, to Subcommittee B/519/1, Masonry units, which has the responsibility to: aid enquirers to understan
6、d the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee
7、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 Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using t
8、he “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity fro
9、m legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 4, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretari
10、at: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 772-3:1998 E EUROPEAN STANDARD EN 772-3 NORME EUROPE ENNE EUROPA ISCHE NORM August 1998 ICS 91.100.20 Descriptors: construction, masonry u
11、nits, clay, tests, determination, volume, voids, percentage of voids, weight measurements English version Methods of test for masonry units Part 3: Determination of net volume and percentage of voids of clay masonry units by hydrostatic weighing Me thodes dessai des e le ments de maonnerie Partie 3:
12、 De termination du volume net et du pourcentage des vides des e le ments de maonnerie en terre cuite par pese e hydrostatique. Pru fverfahren fu r Mauersteine Teil 3: Bestimmung des Nettovolumens und des prozentualen Lochanteils von Mauerziegeln mittels hydrostatischer Wa gung (Unterwasserwa gung ).
13、 This European Standard was approved by CEN on 2 July 1998. 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 refere
14、nces 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 made by translation under the responsibility of a CEN member int
15、o its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, S
16、pain, Sweden, Switzerland and United Kingdom.Page 2 EN 772-3:1998 BSI 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 publica
17、tion of an identical text or by endorsement, at the latest by February 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 implemen
18、t this European Standard: Austria, Belgium, Czech Republic, Denmark, 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 Sy
19、mbols 3 5 Apparatus 3 6 Sampling 3 7 Test procedure 3 8 Calculation and expression of results 3 9 Test report 4Page 3 EN 772-3:1998 BSI 1998 1 Scope This European Standard specifies a method of determining the net volume of and percentage of voids in clay masonry units (including frogs and cells). 2
20、 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 amendments to or revisio
21、ns 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. prEN 771-1, Specification for masonry units Part 1: Clay masonry units. prEN 772-16, Methods of tes
22、t for masonry units Part 16: Determination of dimensions. 3 Principle The principle of this test is to obtain the net volume of the masonry unit by weighing in air and weighing in water and to subtract this from the gross volume, obtained by measurement of its dimensions, to obtain the volume of voi
23、ds. 4 Symbols M wu is the apparent mass of the specimen in water (g). M au is the mass of the specimen in air (g). l u is the length of the specimen (mm). w u is the width of the specimen (mm). h u is the height of the specimen (mm). V gu is the gross volume of the specimen (mm 3 ). V vu is the volu
24、me of voids in the specimen (mm 3 ). V nu is the net volume of the specimen (mm 3 ). r w is the density of water (g/mm 3 ) (approx. 0,001 g/mm 3 ). 5 Apparatus 5.1 Tank, with adequate capacity to submerge a whole masonry unit. 5.2 Weighing instrument, capable of weighing whole masonry units with an
25、accuracy of at least 0,1 % of their mass when dry. 6 Sampling The method of sampling shall be in accordance with prEN 771-1. The minimum number of specimens shall be six, but a larger minimum number may be specified in the product specification, in which case that larger number shall be used. 7 Test
26、 procedure Measure the length (l u ), width (w u ) and height (h u )o f the specimen in accordance with prEN 772-16. Immerse the specimen in water (5.1) for at least 1 hour. When the apparent masses (M wu ), measured by two successive weighings at 30 min intervals, differ by less than 0,2 % remove t
27、he specimen from the water and record the result of the second weighing as the apparent mass (M wu ). Remove surface water with a damp towel and determine the weight (M au ) immediately. 8 Calculation and expression of results Calculate the net volume of the specimen (V nu )b y subtracting the mass
28、of the specimen obtained by weighing it under water from that obtained when weighing it in air (M au 2 M wu ) and dividing it by the density of water (r w ). Express the net volume of the specimen to the nearest 10 4 mm 3 as V nu = (1) M au 2 M wu r w Determine the mean value of net volume determina
29、tions to the nearest 10 4 mm 3 . Calculate the gross volume of the specimen (V gu )b y multiplying the length (l u ) by the height (h u ) and width (w u ) of the specimen measured in accordance with prEN 772-16 to the nearest 10 4 mm 3 . V gu = l u 3 w u 3 h u (2) Calculate the volume of voids (V vu
30、 )b y V vu = V gu 2 V nu (3) Calculate the percentage of voids to the nearest 1 % by 3 100 % (4) V vu V gu Determine the mean value, if required, to the nearest 1 %.Page 4 EN 772-3:1998 BSI 1998 9 Test report The test report shall contain the following information: a) the number, title and date of i
31、ssue 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 reference to prEN 771-1; e) the number of specimens in sample; f) the net volume of each specimen and
32、the mean value to the nearest 10 4 mm 3 ; g) the percentage of voids of each specimen and the mean value, if required, to the nearest 1 %; h) remarks, if any.blankBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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