1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 772-7:1998 The Euro
2、pean Standard EN 772-7:1998 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 7: Determination of water absorption of clay masonry damp proof course units by boiling in waterBS EN 772-7:199
3、8 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 30696 8 Amendments issued since publication Amd. No
4、. Date Text affected National foreword This British Standard is the English language version of EN 772-7:1998. 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by CEN/TC 125 and is intended that it will partially supersede BS 3921:1985 Specification for clay bricks which will be withdrawn on 30 Sep
5、tember 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 understand th
6、e 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 can
7、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 the “
8、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 from le
9、gal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 3 and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-
10、1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 772-7:1998 E EUROPEAN STANDARD EN 772-7 NORME EUROPE ENNE EUROPA ISCHE NORM August 1998 ICS 91.100.20 Descriptors: construction, masonry units, clay, water absorpti
11、on tests, determination, water absorption, boiling water English version Methods of test for masonry units Part 7: Determination of water absorption of clay masonry damp proof course units by boiling in water Me thodes dessai des e le ments de maonnerie Partie 7: De termination de labsorption deau a
12、 leau bouillante des e le ments de maonnerie en terre cuite servant de coupure de capillarite Pru fverfahren fu r Mauersteine Teil 7: Bestimmung der Wasseraufnahme von Mauerziegeln fu r Feuchteisolierschichten durch Lagerung in siedendem Wasser This European Standard was approved by CEN on 2 July 19
13、98. 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 may be obtained
14、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 into its own language and notified to the Central Secretari
15、at 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, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 7
16、72-7:1998 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 publication of an identical text or by endorsement, at the late
17、st 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 implement this European Standard: Austria, Belgium, Czech Republ
18、ic, 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 Symbols 3 5 Apparatus 3 6 Preparation of specimens 3 7 Tes
19、t procedure 3 8 Calculation and expression of results 3 9 Evaluation of results 3 10 Test report 3Page 3 EN 772-7:1998 BSI 1998 1 Scope This European Standard specifies a method for determining the water absorption of damp proof course clay masonry units by boiling the specimens in water for a fixed
20、 period. 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 amendments to o
21、r revisions 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. 3 Principle The specimens
22、, after drying to constant mass, are weighed and, subsequently immersed in water which is boiled for 5 h, wiped and weighed. The ratio of increase in mass of the saturated specimens to the dry mass is calculated. 4 Symbols W s is the water absorption of the specimen (%). m d is the mass of the dry s
23、pecimen (g). m s is the mass of the saturated specimen (g). 5 Apparatus 5.1 Ventilated oven, capable of maintaining a temperature of 1058C 58C. 5.2 Weighing instrument, capable of weighing the masonry units to an accuracy of 1 g. 5.3 Water tank, with adequate capacity to submerge the whole specimen
24、and provided with a grid so that free circulation of water around all surfaces of the specimen can be achieved. 6 Preparation of specimens 6.1 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 spec
25、ified in the product specification, in which case that larger number shall be used. 6.2 Drying of specimens The test specimens shall be dried to constant mass in a ventilated oven (5.1) at a temperature of 1058C 58C. Constant mass is reached if, during the drying process, in two consecutive weighing
26、s 24 h apart, the loss in mass between the two determinations is not more than 0,2 % of the total mass. 7 Test procedure Weigh the specimen after drying (m d ). Place the specimen into a tank of water (5.3) immediately after weighing ensuring that water can circulate freely on all sides. Heat the wa
27、ter to boiling point in approximately 1 h, boil continuously for 5 h, and then allow to cool to room temperature by natural loss of heat for not less than 16 h. Remove the specimen, wipe off the surface water with a damp cloth, and weigh within 2 min after its removal from the water (m s ) When wipi
28、ng perforated units, water that might otherwise be left in the perforations shall be removed by shaking. 8 Calculation and expression of results Report the water absorption (w s ) of each specimen as the ratio of the increase in mass of the saturated specimen to the mass of the dry specimen. Calcula
29、te this to the nearest 0,1 % using the following equation: W s = 3 100 % m s 2 m d m d 9 Evaluation of results Calculate the mean value of the water absorption of the specimens to the nearest 0,1 %. 10 Test report The test report shall contain the following information: a) the number, title and date
30、 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 reference to prEN 771-1; e) the number of specimens in the sample; f) the mass of each specimen d
31、ry and saturated; g) the individual and mean water absorption values to the nearest 0,1 %; h) remarks, if any.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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