1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 772-11:2011Methods of test for masonry unitsPart 11: Determination of water absorption of aggregate concrete, autoclaved aerated concrete, manufactured stone and natural st
2、one masonry units due to capillary action and the initial rate of water absorption of clay masonry unitsBS EN 772-11:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 772-11:2011. It supersedes BS EN 772-11:2000, which is withdrawn.The UK participation in its
3、 preparation was entrusted to T e c h n i c a l C o m m i t t e e B / 5 1 9 / 1 , M a s o n r y u n i t s .A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users
4、are responsible for its correct application. BSI 2011 ISBN 978 0 580 70258 7 ICS 91.100.15; 91.100.30 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2011
5、.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 772-11:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 772-11 May 2011 ICS 91.100.15; 91.100.30 Supersedes EN 772-11:2000English Version Methods of test for masonry units - Part 11: Determination of water absorption of ag
6、gregate concrete, autoclaved aerated concrete, manufactured stone and natural stone masonry units due to capillary action and the initial rate of water absorption of clay masonry units Mthodes dessai des lments de maonnerie - Partie 11: Dtermination de labsorption de leau par capillarit des lments d
7、e maonnerie en bton de granulats, en bton cellulaire autoclav, en pierre reconstitue et naturelle et dutaux initial dabsorption deau des lments de maonnerie en terre cuite Prfverfahren fr Mauersteine - Teil 11: Bestimmung der kapillaren Wasseraufnahme von Mauersteinen aus Beton, Porenbetonsteinen, B
8、etonwerksteinen und Natursteinen sowie der anfnglichen Wasseraufnahme von Mauerziegeln This European Standard was approved by CEN on 25 December 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status
9、 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 European Standard exists in three official versions (English, French, Germ
10、an). 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 are the national standards bodies of Austria, Belgium, Bulgaria, Croatia
11、, 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, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZAT
12、ION 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. Ref. No. EN 772-11:2011: EBS EN 772-11:2011EN 772-11:2011 (E) 2 Content
13、s Page Foreword 31 Scope 42 Normative references 43 Principle 44 Symbols 45 Apparatus56 Preparation of specimens 57 Test procedure 58 Calculation and expression of results 69 Evaluation of results 610 Test report 7Annex A (informative) Significant technical changes between this European standard and
14、 the previous edition .8BS EN 772-11:2011EN 772-11:2011 (E) 3 Foreword This document (EN 772-11:2011) 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
15、 of an identical text or by endorsement, at the 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 shal
16、l not be held responsible for identifying any or all such patent rights. This document supersedes EN 772-11:2000. Annex A provides details of significant technical changes between this European Standard and the previous edition. According to the CEN/CENELEC Internal Regulations, the national standar
17、ds 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, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Pol
18、and, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 772-11:2011EN 772-11:2011 (E) 4 1 Scope This European Standard specifies a method of determining the water absorption coefficient due to capillary action for aggregate concrete, autoclaved aerated co
19、ncrete, natural stone and manufactured stone masonry units and the initial rate of water absorption for clay masonry units. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For unda
20、ted references, the latest 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: Ag
21、gregate concrete masonry units (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
22、stone masonry units EN 772-16, Methods of test for masonry units Part 16: Determination of dimensions 3 Principle After drying to constant mass, a face of the masonry unit is immersed in water for a specific period of time and the increase in mass is determined. In the case of clay masonry units the
23、 initial rate of absorption of the bed face is measured. In the case of aggregate concrete, autoclaved aerated concrete, natural stone and manufactured stone masonry units the water absorption of face of the unit to be exposed is measured, as described in the relevant product standard. 4 Symbols mdr
24、y,s is the mass of the specimen after drying, (g); mso,s is the mass of the specimen in grams after soaking for time t, (g); As is the gross area of the face of the specimen immersed in water, (mm2); tso is the time of soaking, (s); NOTE Specified in the relevant part of EN 771. cw,s is the coeffici
25、ent of water absorption due to capillary action for aggregate concrete autoclaved aerated concrete, natural stone and manufactured stone masonry units; cwi,s is the initial rate of water absorption for clay masonry units, kg/(m2 min). BS EN 772-11:2011EN 772-11:2011 (E) 5 5 Apparatus 5.1 Large tray
26、of minimum depth of 20 mm and of plan area larger than the face of the masonry unit to be immersed, fitted with a means of maintaining constant water level. 5.2 Supporting device of 400 mm2 maximum plan area to keep each specimen clear of the base of the tray. 5.3 Stopwatch graduated in seconds. 5.4
27、 Ventilated oven capable of maintaining a temperature of 70 C 5 C for aggregate concrete, autoclaved aerated concrete, natural stone and manufactured stone units or 105 C 5 C for clay units. 5.5 Weighing instrument capable of weighing the specimens to an accuracy of 0,1 % of their mass when dry. 6 P
28、reparation of specimens 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 which case that larger number shall be used. 6.2 Drying Dry
29、 the test specimens to constant mass mdry,s in a ventilated oven (5.4) at a temperature of 70 C 5 C for aggregate concrete, autoclaved aerated concrete, natural stone and manufactured stone masonry units or 105 C 5 C for clay masonry units. Constant mass is reached, if during the drying process in t
30、wo subsequent weighings with a 24 h interval, the loss in mass between the two determinations is not more than 0,1 % of the total mass. 7 Test procedure Allow the specimens to cool at room temperature. When cool, measure the dimensions of the faces to be immersed in accordance with the principle inc
31、orporated in EN 772-16 and calculate the gross area As. Place the specimens with their faces (bed faces in the case of clay units) supported on a supporting device (5.2) so that they are clear of the base of the tray (5.1) and immerse in water to a depth of 5 mm 1 mm for the duration of the test. In
32、 the case of masonry units with an extremely irregular face, raise the water-level in such a way that the complete surface just makes contact with the water surface. For natural stone masonry units record whether the test face is parallel or perpendicular to the bedding planes. Activate the timing d
33、evice. Maintain the water level constant throughout the test. For aggregate concrete, autoclaved aerated concrete, natural stone and manufactured stone units, cover the tank to avoid evaporation from the wet specimens. After the immersion time (tso) specified in EN 771-1, EN 771-3, EN 771-4, EN 771-
34、5 or EN 771-6 remove the specimens, wipe off surface water and weigh them (mso,s). For natural stone masonry units, remove the specimens from the water at regular intervals, wipe off the water, weigh them, then re-immerse them. Continue this procedure until no further increase in mass is observed. F
35、or some clay masonry units the initial rate of water absorption can differ for the two bed faces, in which case it will be necessary to measure on both faces. BS EN 772-11:2011EN 772-11:2011 (E) 6 8 Calculation and expression of results 8.1 Coefficient of water absorption due to capillary action of
36、aggregate concrete and manufactured stone units Calculate the coefficient of water absorption of the masonry units due to capillary action to the nearest 0,1g/m2.s using the following formula: ()smgtAmmcso=26ssdry,sso,sw,/10 8.2 Coefficient of water absorption due to capillary action of autoclaved a
37、erated concrete and natural stone masonry units Calculate the coefficient of water absorption of the masonry units due to capillary action of each specimen to the nearest 1 g/(m2 s0,5) using the following formula: ()0,526sossdry,sso,sw,/10 smgtAmmc = In the case of natural stone masonry units, plot
38、a graph of ssdry,sso,Amm against the square root of the time immersed, in seconds. Calculate cw,s as the gradient over the initial linear portion of the graph. 8.3 Initial rate of water absorption of clay masonry units Calculate the initial rate of water absorption of each clay masonry unit to the n
39、earest 0,1 kg/(m2 min) using the following formula: ()min/1023ssdry,sso,iw,= mkgtAmmc where t = 1 min. 9 Evaluation of results For aggregate concrete and manufactured stone masonry units calculate the mean of the coefficients of water absorption due to capillary action to the nearest 0,1 g/(m2x s).
40、For autoclaved aerated concrete and natural stone masonry units calculate the mean of the coefficients of water absorption due to capillary action to the nearest 1 g/(m2x s0,5). For clay masonry units calculate the mean of the initial rates of water absorption to the nearest 0,1 kg/(m2 min). BS EN 7
41、72-11:2011EN 772-11:2011 (E) 7 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 (in the case of aggregate concrete, a
42、utoclaved aerated concrete and manufactured stone masonry units only); d) description of the specimens to the relevant part of EN 771; e) number of specimens in the sample and whether these are whole units or representative portions thereof; f) date of receipt of the specimens in the testing laborat
43、ory; g) for aggregate concrete and manufactured stone masonry units, the individual values of water absorption coefficient due to capillary action to the nearest 0,1 g(m2x s) for each unit, the length of time of immersion and the mean water absorption coefficient due to capillary action to the neare
44、st 0,1 g(m2x s); h) for autoclaved aerated concrete and natural stone masonry units, the individual values of water absorption coefficient due to capillary action to the nearest 1 g/(m2x s 0,5) for each unit, the length of time of immersion and the mean water absorption coefficient due to capillary
45、action to the nearest 1 g/(m2x s 0,5). For natural stone masonry units state whether the test face was parallel or perpendicular to the bedding planes; i) for clay masonry units, the individual values of initial rate of water absorption to the nearest 0,1 kg/(m2 min), and the mean of the initial rat
46、es of water absorption to the nearest 0,1 kg/(m2 min); j) remarks, if any. BS EN 772-11:2011EN 772-11:2011 (E) 8 Annex A (informative) Significant technical changes between this European standard and the previous edition The coefficient of water absorption of aggregate concrete and manufactured ston
47、e masonry units is now calculated to a new formula given in 8.1. In the previous edition, the formula now given in 8.2 had been applied to these types of units also. This page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-r
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