1、July 2011 Translation by DIN-Sprachendienst.English price group 6No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 91
2、.100.15!$s;“1805824www.din.deDDIN EN 772-21Methods of test for masonry units Part 21: Determination of water absorption of clay and calcium silicatemasonry units by cold water absorptionEnglish translation of DIN EN 772-21:2011-07Prfverfahren fr Mauersteine Teil 21: Bestimmung der Kaltwasseraufnahme
3、 von Mauerziegeln und KalksandsteinenEnglische bersetzung von DIN EN 772-21:2011-07Mthodes dessai des lments de maonnerie Partie 21: Dtermination de labsorption deau des lments de maonnerie en terre cuiteet en silico-calcaire par absorption deau froideTraduction anglaise de DIN EN 772-21:2011-07www.
4、beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.807.11 DIN EN 772-21:2011-07 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 125 “Masonry” (Secretariat: BSI, United
5、 Kingdom). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee), Working Committee NA 005-06-04 AA Prfverfahren (SpA zu CEN/TC 125/WG 4). 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 772-21 May 2011 IC
6、S 91.100.15 English Version Methods of test for masonry units - Part 21: Determination of water absorption of clay and calcium silicate masonry units by cold water absorption Mthodes dessai des lments de maonnerie - Partie 21: Dtermination de labsorption deau des lments de maonnerie en terre cuite e
7、t en silico-calcaire par absorption deau froide Prfverfahren fr Mauersteine - Teil 21: Bestimmung der Kaltwasseraufnahme von Mauerziegeln und Kalksandsteinen This European Standard was approved by CEN on 25 December 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations whic
8、h 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 CEN-CENELEC Management Centre or to any CEN member. This Eur
9、opean 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members a
10、re the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Swed
11、en, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.
12、Ref. No. EN 772-21:2011: EEN 772-21:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Principle 44 Symbols 45 Apparatus .46 Preparation .56.1 Sampling .56.2 Drying 57 Test procedure .58 Calculation of results 59 Evaluation of results .510 Test report 5DIN EN 772-21:2011-07 EN 772
13、-21:2011 (E) 3 Foreword This document (EN 772-21:2011) has been prepared 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
14、 latest by November 2011, and conflicting national standards shall be withdrawn at the latest by November 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any o
15、r all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
16、 Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 772-21:2011-07 EN 772-21:2011 (E) 4 1 Scope This European Standard specifies a method of determining
17、the water absorption of clay and calcium silicate masonry units by immersing them in cold water. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest
18、edition of the referenced document (including any amendments) applies. EN 771-1, Specification for masonry units Part 1: Clay masonry units EN 771-2, Specification for masonry units Part 2: Calcium silicate masonry units EN 771-3, Specification for masonry units Part 3: Aggregate concrete masonry un
19、its (Dense and light-weight aggregates) EN 771-4, Specification for masonry units Part 4: Autoclaved aerated concrete masonry units EN 771-5, Specification for masonry units Part 5: Manufactured stone masonry units EN 771-6, Specification for masonry units Part 6: Natural stone masonry units 3 Princ
20、iple After drying to constant mass a masonry unit is immersed in water for 24 h and the increase in mass is determined. 4 Symbols Md is the mass of the specimen after drying (g); Msis the mass of the specimen after soaking (g); Wsis the water absorption of the specimen (%). 5 Apparatus 5.1 Water tan
21、k large enough to contain all of the samples, supported off the base of the tank so that water is in contact with all the faces of the specimen. 5.2 Ventilated oven capable of maintaining a temperature of 105 C + 5 C. 5.3 Weighing instrument capable of weighing the specimens to an accuracy of 0,1 %
22、of their mass when dry. DIN EN 772-21:2011-07 EN 772-21:2011 (E) 5 6 Preparation 6.1 Sampling The method of sampling shall be in accordance with the relevant part of EN 771. The minimum number of specimens shall be six, but a larger minimum number may be specified in the product specification, in wh
23、ich case that larger number shall be used. 6.2 Drying Dry the test specimens to constant mass Mdin a ventilated oven (5.2) at a temperature of 105 C + 5 C. Constant mass is reached if, during the drying process in two subsequent weighings with not less than a 24 h interval, the loss in mass between
24、the two determinations is not more than 0,2 % of the total mass. Allow the specimens to cool to ambient temperature before they are weighed. 7 Test procedure Place each unit in the tank of water. Leave clay units submerged for 24 h + 0,5 h. Leave calcium silicate units submerged for 48 h 0,5 h. Take
25、 the units from the tank and remove any water from their surfaces using a damp cloth or sponge. Weigh the specimens and record their mass, Ms. 8 Calculation of results Calculate the water absorption Wsof each of the units to the nearest 1 %. Ws= ddsMMM x 100 % 9 Evaluation of results Calculate the m
26、ean water absorption to the nearest 1 %. 10 Test report The test report shall contain the following information: a) number , title and date of issue of this European Standard; b) name of the organization that carried out the sampling and the method used; c) date of testing; d) description of the spe
27、cimens to EN 771-1 or EN 771-2 as is relevant; e) number of specimens in the sample; DIN EN 772-21:2011-07 EN 772-21:2011 (E) 6 f) mass of each specimen dry and after soaking; g) soaking period in hours; h) individual and mean water absorption values to the nearest 1 %; i) remarks, if any. DIN EN 772-21:2011-07
