1、STD.BS1 BS EN 772-7-ENGL 1778 Lb24bb9 0744022 2T7 D BRITISH STANDARD Methods of test for masonry units - Part 7: Determination of water absorption of clay masonry damp proof course units by boiling in water The European Standard EN 772-7 1998 has the status of a British Standard ICs 91.100.20 BS EN
2、772-7: 1998 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW STD.BSI BS EN 772-7-ENGL 1778 Zb24bb7 O744023 133 been prepared under the direction of the Sector AmdNo. Committee for Building and Civil Engineering, was published under the authority of the Standards Conunittee and
3、comes into effect on 15 December 1998 O BSI 19% ISBN O 6 306% 8 BS EN 772-7:1998 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 CENRC 125 and is intended that it will partially supersed
4、e BS 3921: 19% Sdfkution for clap bricks which will be withdrawn on 30 September 2000 if all the European standards included in the package are available.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 B519/1, Mason
5、ry units, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed
6、, them in the UK. 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 Standards Catalogue under the sect
7、ion entitled “International Standards Correspondence Index”, or by using the “Find” facjiity 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.
8、 Compliance with a British Standard does not of itself confer immunity from legal 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. STD-BSI BS EN 772-7-ENGL 1778 W Lb24bb7 07LILIO24 07T = EUROPW SIANDARD EN 7
9、72-7 NOFUE EUR0PEE”E EuRopAIscHE NORM August 1998 ICs 91.100.20 Descriptors: construction, masonry units, clay, water absorption tests, determination, water absorption, boiling water English version Methods of test for masonry units - Part 7: Determination of water absorption of clay masonry damp pr
10、oof come units by bom in water Mthodes dessai des lments de maonnerie - Partie 7: Dtermination de labsorption deau leau bouiliante des lments de maonnerie en terre cuik servant de coupure de capillasit prufverfahren fr Mauersteine - Ted 7 Ekstimmung der Wasseraufriahme von Mauemiegeln fur Feuchkisol
11、iemhichkn durch Lagerung in siedendem Wasser This European Standard was approved by CEN on 2 July 1998. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipuiate the conditions for giving this European Standard the status of a national standard without any alteration.
12、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. Tkis European Standard exists in three official versions (Enghh, French, German). A version in any other language made by translation und
13、er the responsibility of a CEN member into 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, German3 Greece, Iceland, Ireland, Italy, Luxe
14、mbourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standarization Comit Europen de Normalisation Europisches Komitee fur Normung Central Secretariat: rue de Stassart 36, B-1060 Brussels O 1998 CEN AU rights of exploitation in any form and
15、 by any means reserved worldwide for CEN national Members. Ref. No. EN 772-71998 E STD-BSI BS EN 772-7-ENGL 1998 9 LbZqbbS 0744025 TOb 9 Page 2 EN 772-7:1998 Foreword This European standard has been prepared by khnid Committee CENiIy= 125, Masow, the Secretariat of which is held by BSL This European
16、 standard shall be given the status of a national standard, either by publication 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 CENKENELEC Internal Regulations, the natio
17、nal standards organizations of the folowing countries are bound to implement this European Standrud. Austria, Belgium, Czech Republic, Denmark, Finland, hce, Germanx Greece, Icehd, irehd, I*, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Forew
18、ord 1 Scope 2 Nonnative references 3 Principle 4 symbols 5 APP- 6 Preparation of specimens 7 Testprocedure 8 9 Evaiuaionofresults Calculation and expression of results 10 %report page 2 3 3 3 3 3 3 3 3 3 3 O BSI 1998 STD-BSI BS EN 772-7-ENGL L778 lb2qbb7 074402b 992 = 1 scope This European Standard
19、specifies a method for determining the water absorption of damp proof course clay masonry units by boiling the specimens in water for a fixed period. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative referenc
20、es are cited at the appropriate places in the text and the publications are listed hereafter. For dated references subsequent amendments to or revisions of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edit
21、ion of the publication referred to applies. prEN 771-1, Specifkation for masonry units - Part 1: Clay masonry units. 3 Principle The specimens, after drymg 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 t
22、he caturated specimens to the dry mass is calculated. 4 Symbols W, md m, is the water absorption of the specimen (%). is the mass of the dry specimen (g). is the mass of the saturated specimen (g). 5 Apparatus 6.1 VmtZlated oven, capable of maintaining a temperature of 105 OC f 5 OC. 6.2 Weighing in
23、strument, capable of weighing the masonry units to an accuracy of 1 g. 5.3 Wa,m tank, with adequate capacity to submerge the whole specimen 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 meth
24、od 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. 6.2 Drying of specimens The test specimens shall be dried to constant mass i
25、n a ventilated oven (5.1) at a temperature of 105 “C f 5 OC. Constant mass is reached if, during the drying process, in two consecutive weighmgs 24 h apart, the loss in mass between the two determinations is not more than 0,2 % of the total mass. Page 3 EN 772-71998 7 Test procedure Weigh the specim
26、en after drying (md). Place the specimen into a tank of water (5.3) immediately after weighing ensuring that water can circulate freely on all sides. Heat the water to boiling point in approximately 1 h, boil continuously for 5 h, and then allow to cool to room temperature by naturai loss of heat fo
27、r not less than 16 h. Remove the specimen, wipe off the surface water with a damp cloth, and weigh wittun 2 min after its removal from the water (ms) When wiping perforated units, water that might otherwise be left in the perforations shall be removed by shaking. 8 Calculation and expression of resu
28、lts Report the water absorption (w,) of each specimen as the ratio of the increase in mass of the saturated specimen to the mass of the dry specimen. Calculate this to the nearest 0,1% using the following equation: w -m,-mdx 100% md s- 9 Evaluation of results calculate the mean value of the water ab
29、sorption of the specimens to the nearest 0,l Oh 10 %st 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 typ
30、e, 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 dry and saturated g) the individual and mean water absorption values to the nearest 0,l “/; h) remarks, if any O BSI 1998 BS EN 772-71998 BSI 389 Chiswick
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