1、 STDmBSI BS EN 772-10-ENGL 1999 E 1b2LibbS O797933 593 BRITISH STANDARD Methods of test for masonry units - Part 10: Determination of moisture content of calcium silicate and autoclaved aerated concrete units The European Standard EN 772-10 1999 has the status of a British Standard ICs 91.100.15; 91
2、.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGIPT LAW BS EN 772-101999 STD-BSI BS EN 772-LO-ENGL 3777 = lb24bb7 079773Li Li2T BS EN 772-10:1999 been prepared under the Committee for Buiiding and Civil Engineering, was published under the authority of the Standards Committee
3、 and comes into effect on 15 July 1999 direction of the Sector Amd. No. Date O BSI 07-1999 ISBN O 580 30801 4 National foreword Comments This British Standard is the English hguage version of EN 772101999. No British Standard is superseded The UK participation in its preparation was entrusted by “kc
4、hnical Committee m19, Masonry and associated testing, to Subcommittee B/519/1, Masonry units, which has the responsibility to: - aid enquirem to understand the text; - present to the responsible European committee any enquines on the interpretation, or proposals for change, and keep the UK interests
5、 informed - monitor related intedonal and European developments and promulgate 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 t
6、o in this document may be found in the BSI Standards Catalogue under the section entitled “htemational Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ail the necessary provisions of a contract
7、. Users of British Standards are responsible for their correct application. 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 hnt cover, the EN title page, pages 2 and 3 and a back cover. EU
8、ROPEAN STANDARD NORME EUR0PEE”E EUROP- NORM EN 772-10 February 1999 ICs 91.100.20 Er mo,+ is the mass of specimen before drying, in grams; m*,+ is the mass of specimen after drying, in grams. 5 Apparatus 6.1 Ventilated oven, capable of maintaining a temperature of (105 f 5) OC. 5.2 Weighing instrume
9、nt, capable of weighing specimens to an amuacy of at least 0,1% of their mass. 6 Preparation of specimens Take a representaive sample of no fewer than six units. For units with lengths 2 500 mm andor heights z 300 mm, take no fewer than six representative portions cut hm at least three units. Page 3
10、 EN 7721031999 7 lht procedure Before drying, weigh the test specimens (mo,+). Dry the test specimens at a tempexatwe of (105 f 5) OC, to constant mass. Constant mass is reached if, during the drying process, in two subsequent weighings with a24h intend, the loss in mass between the two determinatio
11、ns is less than 0,2 % of the totai mass. After drying to constant mas, weigh the specimens (mdry,s). 8 calcnlation and expression of results Calculate the moisture content (w,) of the specimen from the ratio of the loss in mass during drying to the dry mass, expressed as a percentage to the nearest0
12、,5% ,x100 mo, - mdw, mw,+ 20, = 9 Evaluation of results calculate the mean value of the moisture content of the specimens to the nearest 1 Om 10 Test report The test report shaii contain the foilowing infodon: a) the number, title and date of issue of this European Standasd; b) a description of the
13、specimens to the relevant part of prEN 771; c) the method of sampling, and by which organization; d) the date of deiivery of the specimens; e) the date of preparation of the specimen and the f) the number of specimens in the sample, and whether these are whole units or representative portions thereo
14、f; g) the individual values of moisture content to the nearest 0,5 % and the mean value of moisture content to the nearest 1 “m; h) remarks, if any date of testing; O BSI 07-1999 BS EN 772-10: 1999 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent na
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