BS EN 772-10-1999 Methods of test for masonry units - Determination of moisture content of calcium silicate and autoclaved aerated concrete units《圬工砌块的试验方法 硅酸钙和蒸气加气混凝土结构中水分含量的测定》.pdf

1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 772-10:1999 The Eur

2、opean Standard EN 772-10:1999 has the status of a British Standard ICS 91.100.15; 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Methods of test for masonry units Part 10: Determination of moisture content of calcium silicate and autoclaved aerated concrete unitsThi

3、s 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 July 1999 BSI 07-1999 ISBN 0 580 30801 4 BS EN 772-10:1999 Amendments issued since publica

4、tion Amd. No. Date Comments National foreword This British Standard is the English language version of EN 772-10:1999. No British Standard is superseded. The UK participation in its preparation was entrusted by Technical Committee B/519, Masonry and associated testing, to Subcommittee B/519/1, 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 interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them

6、 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 section e

7、ntitled “International Standards Correspondence Index”, or by using the “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. Comp

8、liance 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 and 3 and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Euro

9、pa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 772-10:1999 E EUROPEAN STANDARD EN 772-10 NORME EUROPE ENNE EUROPA ISCHE NORM February 199

10、9 ICS 91.100.20 English version Methods of test for masonry units Part 10: Determination of moisture content of calcium silicate and autoclaved aerated concrete units Me thodes dessai des e le ments de maonnerie Partie 10: De termination de la teneur en humidite des e le ments de maonnerie en silico

11、-calcaire et en be ton cellulaire autoclave Pru fverfahren fu r Mauersteine Teil 10: Bestimmung des Feuchtegehaltes von Kalksandsteinen und Mauersteinen aus Porenbeton This European Standard was approved by CEN on 14 October 1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulat

12、ions 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 on application to the Central Secretariat or to any CEN member. This Euro

13、pean 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 Secretariat has the same status as the official versions. CEN members are the nati

14、onal 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 772-10:1999 BSI 07-1999 Foreword This European Standard has been prepared

15、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 latest by August 1999, and conflicting national standards shall be withdr

16、awn 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 Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,

17、 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 Test procedure 3 8 Calculation and expression of results 3 9 Evaluation of

18、 results 3 10 Test report 3Page 3 EN 772-10:1999 BSI 07-1999 1 Scope This European Standard specifies a method for determining the moisture content of calcium silicate and autoclaved aerated concrete masonry units. 2 Normative references This European Standard incorporates by dated or undated refere

19、nce, 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 or revisions of any of these publications apply to this European standard only when incorporat

20、ed in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. prEN 771-2, Specification for masonry units Part 2: Calcium silicate masonry units. prEN 771-4, Specification for masonry units Part 4: Autoclaved aerated concrete masonry units. 3 P

21、rinciple After drying to constant mass, the moisture content is calculated as the ratio of the loss of mass during drying to the mass after drying. 4 Symbols w s is the moisture content, in percentage by mass; m o,s is the mass of specimen before drying, in grams; m dry,s is the mass of specimen aft

22、er drying, in grams. 5 Apparatus 5.1 Ventilated oven, capable of maintaining a temperature of (105 5)8C. 5.2 Weighing instrument, capable of weighing specimens to an accuracy of at least 0,1 % of their mass. 6 Preparation of specimens Take a representative sample of no fewer than six units. For unit

23、s with lengths$ 500 mm and/or heights$ 300 mm, take no fewer than six representative portions cut from at least three units. 7 Test procedure Before drying, weigh the test specimens (m o,s ). Dry the test specimens at a temperature of (105 5)8C, to constant mass. Constant mass is reached if, during

24、the drying process, in two subsequent weighings with a 24 h interval, the loss in mass between the two determinations is less than 0,2 % of the total mass. After drying to constant mass, weigh the specimens (m dry,s ). 8 Calculation and expression of results Calculate the moisture content (w s ) of

25、the specimen from the ratio of the loss in mass during drying to the dry mass, expressed as a percentage to the nearest 0,5 %: w s = 3 100 m o,s 2 m dry,s m dry,s 9 Evaluation of results Calculate the mean value of the moisture content of the specimens to the nearest 1 %. 10 Test report The test rep

26、ort shall contain the following information: a) the number, title and date of issue of this European Standard; b) a description of the specimens to the relevant part of prEN 771; c) the method of sampling, and by which organization; d) the date of delivery of the specimens; e) the date of preparatio

27、n of the specimen and the date of testing; f) the number of specimens in the sample, and whether these are whole units or representative portions thereof; g) the individual values of moisture content to the nearest 0,5 % and the mean value of moisture content to the nearest 1 %; h) remarks, if any.B

28、S EN 772-10:1999 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

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