1、 STD.BSI BS EN 772-15-ENGL 2000 Lb2qbhS OBbBA43 bT3 BRITISH STANDARD Methods of test for masonry units - Part 15: Determination of water vapour permeability of autoclaved aerated concrete masonry units The European Standard EN 772162000 has the status of a British Standard ICs 91.080.30; 91.100.30 N
2、O COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGET LAW BS EN 772-15:2000 STD-BSI BS EN 772-15-ENGL 2000 I lib29bb9 ObqLi 53T I BS EN 772-15:2000 Amd. No. Date National foreword Comments This British Standard is the official English language version of EN 772-152000. No British Standar
3、d is being superseded. The UK participation in its preparation was enlmsted by Technical Committee B/519, Masonry and associated tests, to Subcommittee B/519/1, Masonry units, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any
4、 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 be obtained on request to its secrew. Cross-references T
5、he British Standards which implement intemational 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 “Find” facility of the BSI Standards Electronic Catalogue. A
6、British Standard does not purport to include ail the necessary provisions of a contsact. 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
7、8 mm to 10 mm may be appropriate for relatively impermeable specimens and 20mm to 50mm for more permeable specimens. The thickness shall be measured using calipers and shall be reported. O BSI 09-2000 Page 6 EN 772-15:2000 7.2 Sampling The method of sampling shall be in accordance with prEN 771-4. T
8、he minimum number of specimens shall be three, but a larger minimum number may be specified in the product specification, in which case that larger number shall be used. 8 Test procedure Note: Although there are no requirements for conditioning specimens before testing, it will take longer for the t
9、est to reach equilibrium if the specimens are far fiom being in an air dry condition at the start of the test. Set all the specimens in test cups (6.1) and seal the edges with an appropriate sealant (6.3) or sealing ring. If not previously done, determine the area of the specimen. For the upper hygr
10、oscopic range (wet cup method), control the water vapour pressure using the potassium nitrate solution (KNQ) (6.4). For the lower hygroscopic range (dry cup method), control the water vapour pressure using the lithium chloride solution (LiCl.Hz0) (6.5). In each case leave a small air-gap of approxim
11、ately 10 mm between the specimen and the surface of the solution, (see Figure 1). Place the cups in an enclosure (6.6) with a temperature of 20 “C f 2 “C and a relative humidity of 50 % f 5 % r.h. and which is large enough to ensure good air circulation. Weigh the cups at appropriate time intervals.
12、 Draw a graph with mass of the cup against time. If three points can be placed on one straight line, the conditions are considered to be stable, i.e. the quantity of water vapour passing through the specimen per unit time is constant. 9 Expression of test results From each graph determine the water
13、vapour flux, -. Calculate the water vapour permeance using the following equation: AG At where: Ap is taken from appropriate tables, (Pa). The water vapour permeability is given as the mean value to the nearest 1 % for the water vapour permeance multiplied by the thickness of specimen in metres to t
14、he nearest 1 %. O BSI 09-2000 STD-BSI BS EN 772-15-ENGL 2000 m lbZLibb9 OBbB85l 77T Key: 2 Sealant 4 6 Area (= 0,02 m2) Air gap (= 10 mm) Page 7 EN 772-15:2000 1 Specimen 3 Circular test cup 5 Saturated salt solution 10 Test report The test report shall provide the following information: a) the numb
15、er, 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 reference to prEN 7714; e) the number of specimens in the sample; f) the date o
16、f receipt of the specimens in the testing laboratory; g) part of hygroscopic range tested; h) identification of the specimen and its thickness; i) curing regime for moulded specimens; j) individual and mean water vapour permeance and the water vapour permeability to the nearest 1 %; k) any other inf
17、ormation of importance for the evaluation of the test results; i) remarks, if any. 1 b - *. *. : ;. :. , = Figure 1: Test cup (6.1) with test specimen Q BSI 09-2000 STD=BSI BS EN 772-15-ENGL 2000 W Lb2LIbbS 08b8852 bob = BS EN 772-15:2000 BSI 389 Chiswick High Road London w4 4AL BSI - British Standa
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