1、STD-BSI BS EN L925-ENGL 1999 m 1624669 0790814 31“ W BRITISH STANDARD Natural stone test methods - Determination of water absorption coefficient by capillarity The European Standard EN 19251999 has the status of a British Standard ICs 91.100.16 BS EN 1925:1999 NO COPYING WITHOUT BSI PERMISSION EXCEP
2、T AS PERMITTED BY COPYRIGKT LAW STD.BS1 BS EN 3925-ENGL 1794 111 Lb24bb9 0790835 25b direction of the Sector AmdNo. Committee for Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 August 1999 0 BSI 08-1999 BS EN 1925:1999 Date co
3、mments National foreword This British Standard is the English language version of EN 19251999. The UK participation in its preparation was entrusted to Technical Committee W545, Natural stone, which has the responsibfity to: - aid enquirers to understand the text; - present to the responsible Europe
4、an committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. C
5、ross-references The 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 Stan 91.100.15 En
6、glish version Natural stone test methods - DekMon of water absorption coefficient by capillarity Mthodes dessai pour pierres naturelles - Dtemhdion du coefcient dabsorption deau par priifverahrenfUrNatuistein-Bestimmungdes Waseraujkahrnekoeenten infolge capwt Kapiuaswirkung This European Standard wa
7、s approved by CEN on 12 February 1999. CEN members are bound to comply with the CENKENELEC Internal Regulations which Stipulate the conditions for giving this European Standard the status of a national standard without any alteraiion. Up-to-date lists and bibliogaphical references concerning such na
8、tional 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 veision in any other language made by translation under the responsibility of a CEN member into its own language and
9、notified to the CenW 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, Spain, Sweden, Switzerland
10、and United Kingdom. CEN European Committee for Standardizaton Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, 5-1060 Brussels O 1999 CEN AU rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No.
11、 EN 19251999 E Page 2 EN 19251999 Foreword This European Standard has been prepared by Technical Committee CENITC 246, Natural stones, the Secretariat of which is held by UNI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by en
12、dorsement, at the latest by September 1999, and conflicting national standards shall be withdrawn at the latest by September 1999. This draft standard is one of the series of draft standards for tests on natural stone. Test methods for natura stone consist of the following Parts. EN 1926, Natural st
13、one test methods - Determination of comprasive streng%. EN 1936, Natural stone test methods - Determinaticm of real density and apparent ohsitg and of total and EN 12370, Natuml stone test methods - Determination of resistance to salt crystallization. prEN 12371, Natural stone test methods - Determi
14、nation of frost resistance. EN 12372, Natuml stone test methods- Determination of jiemd strength under concentrated bad. prEN 12407, Natural stone test methods - Petmgraphic successive masses of the specimen during testing, area of the side immersed in water, in square metres; times elapsed from the
15、 beginning of the test until the times at which the successive masses were measured, in seconds; water absorption coefficient by capillarity perpendicular to the planes of anisotropy of the stone, in grams per square metre per square root of seconds; water absorption coefficient by capillarity paral
16、lel to the planes of anisotropy of the stone, in grams per square metre per square root of seconds. in grams; Page 3 EN 19261999 6 Apparatus 6.1 Covered tank, with flat base comprising small non-oxidking and non-absorbent supports for the specimens. 6.2 Device, able to maintain a constant water leve
17、l in the tank, described in 6.1. 6.3 17ime countq with an accuracy of 1 s. 6.4 Vmtuted om, which can maintain a temperature of (70 f 5) OC. 6.6 Weighim instrumt, with an accuracy of 0,Ol g. 6.6 Linear measuring device, with an accuracy of 0,05 nun. 6.7 Air conditwned mom, with (20 * 5) OC. 6 Prepara
18、tion of the specimens 6.1 Sampling Sampling is not the responsibility of the test laboratory except where especially requested At least six specimens shall be selected from a homogenous batch and tested for each direction of rise of water in relation to the position of any anisotropy planes (e.g. be
19、dding planes, foliation, etc.) which shall be marked on ail specimens by at least two parallel lines. The specimens shall be rough cut or may have one or two polished or honed faces. These faces are to be placed vertically (the worked face shall never be the Mersed face). 6.2 Dimensions of the test
20、specimens The test specimens shall be cubes with (70 f 5) mm or (50 f 5) mm edge or right circular cylinders whose diameter and height are equal to (70 f 5) mm or (50 f 5) mm. 6.3 Drying the specimens The test specimens are to be dried to constant mas in a ventiiated oven at a temperature of (70 f 5
21、) OC. Constant mass is reached when the difference between two successive weighmgs at an interval of (24 f 2) h is not greater than 0,1% of the mass of the specimen. The specimens shall be kept in a desiccator until room temperature (20 * 5) OC is attained. O BSI 08-1999 STDmBSI BS EN 1925-ENGL 1999
22、 I 1b24bb9 0790839 qT b) the number, title and date of issue of this European Standara c) the name and address of the test laboratory and the address where the test was carried out if different from the test laboratory; d) the name and address of the client; e) it is the responsibiity of the client
23、to supply the following information: - the petrographic name of the stone; - the commercial name of the stone in accordance with prEN 12440; - the country and region of extractioq - the name of the supplier; - the direction of any existing plane of anisotropy (i relevant to the test) to be clearly i
24、ndicated on the sample or on each specimen by means of two parallel lines; - the name of the person or organization which carried out the sampling - the surface finish of the specimen (if rekvant to the test); f) the date of delivery of the sample or of the specimens, g) the date when the specimens
25、were prepared (if relevant) and the date of testing; h) the number of specimens in the sample; i) the dimensions of the specimens; j) for each specimen the water absorption coefficient by capWty Cl perpendicuiar to or C2 el to the planes of anisotropy, expressed to the three significant figure k) th
26、e arithmetic mean of the water absorption coefficients Cl andor Cz expressed to the three 1) ail deviations fiom the standard and their justification; m) remarb. significant ngures; The test report shall contain the signature(s) and role) of the responsible(s) for the testing and the date of issue o
27、f the report. It shall also state that the report shail not be partially reproduced without the written consent of the test aborahry O BSI 08-1999 STD-BSI BS EN 1925-ENGL L999 D Lb24669 0770821 C5T I Page 6 EN 1926:19!39 Annex A (informative) Calculation of water absorption coefficient by capillarit
28、y by means of a non-linear regression function A.l Scope The annex presents a more appropriate equation for determining the water absorption coefficient by capillarity when the approximate formula given in clause 8 cannot be used A.2 Symbols - md A ) surface area of the immersed is the mass of water
29、 related to base and absorbed up to time 4, in grams per square metre; mf is the final mass of the specimen at the end of thetest,ingr;uns; mf - md is the maximum mass of water a (= A ) related to surface area of the immersed base, in grams per square metre; ?/i (= b is the length-related water pene
30、tration coefficient, that is the reciprocal of the square root of the time 4 in seconds. NOTE The other symbols have already been defined in clause 4. A.3 Expression of results The equation given below applies, when, in a test for determining the water absorption coefficient by capillari, the graph
31、showing the mass of absorbed water related to the surface area of the immersed base of the specimen as a function of the square root of time cannot be satisfactorily approximated by two straight lines, that is, when the correlation coefficient between the measured points of the rst part of the graph
32、 and the corresponding regression straight line is not greater than 0,90 (for at least five measurements) or 0,95 (for four measurements). In the case of graph as shown in Figure Al a more appropriate equation to describe the link between the mass of absorbed water related to the surface area (Yi) a
33、nd the square root of the time (Ja is as follows: Yi = a (1 - e+ Niesel, K: Quantifymg capillary rise in columns of porous material. Amer. Cem. Soc. Buii. 67 - (1988) No. 8, 1418. Hoffmann, D.; Niesel, K: Zur rechnerischen Erfassung des Kapiikaufstiegs in Sulen porser Baustoffe. Bautemhutz und Bausa
34、nierung - 10 (1987) No. 5,69-70. Niesel, K.: Dtermination de lascension capillaire de liquide dans des matriaux poreux de construcion. in: Actes de la journe ICOMOS/Direction du Patrimoine “Les remontes deau du sol dans les maonneries“, Paris: Muse des Monuments Franais 25/01/1994, Hoffmann, D.; Nie
35、sel K: Quantifymg the effect of air polutants on rendering and also moktureqrt phenomena in masonry including its constituents. http:/www.bam.dea-vii/mojsturpofi html Paris: 1994,21 pp. O BSI 08-1999 STD.BS1 BS EN 1925-ENGL 1999 W 1624bb9 0790823 322 lil I BS EN 1925: 1999 BSI 389 Chiswick High Road
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