[BS en 772-11-2011] -- Methods of Test for Masonry Units. Determination of Water Absorption of Aggregate Concrete, Autoclaved Aerated Concrete, Manufactured Stone and

BS EN 772-11:2011BSI Standards Publication Methods of test for masonry units Part 11: Determination of water absorption of aggregate 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 91. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2011. The UK participation in its preparation was entrusted to Technical Committee B/519/1. Amendments issued since publication Date Text affected . It supersedes BS EN 772-11:2000. Users are responsible for its correct application. which is withdrawn.100. © BSI 2011 ISBN 978 0 580 70258 7 ICS 91.BS EN 772-11:2011 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 772-11:2011. A list of organizations represented on this committee can be obtained on request to its secretary.30 Compliance with a British Standard cannot confer immunity from legal obligations. This publication does not purport to include all the necessary provisions of a contract.15.100. Masonry units. Latvia. Hungary. Switzerland and United Kingdom. Germany. Ireland. EN 772-11:2011: E worldwide for CEN national Members. Sweden. Finland. Norway. . Spain. Malta.Teil 11: Bestimmung der Détermination de l'absorption de l'eau par capillarité des kapillaren Wasseraufnahme von Mauersteinen aus Beton.30 Supersedes EN 772-11:2000 English Version Methods of test for masonry units . Portugal. 91. éléments de maçonnerie en béton de granulats. This European Standard exists in three official versions (English. France. B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved Ref. Luxembourg.100. autoclaved aerated concrete.Part 11: Determination of water absorption of aggregate concrete. No. Greece.15.100. Estonia. Netherlands. Iceland. Slovenia. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: Avenue Marnix 17. Slovakia. German). en pierre reconstituée et naturelle et du sowie der anfänglichen Wasseraufnahme von taux initial d'absorption d'eau des éléments de maçonnerie Mauerziegeln en terre cuite 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 of a national standard without any alteration. Lithuania. Poland. CEN members are the national standards bodies of Austria. Italy. Romania. Bulgaria. Betonwerksteinen und Natursteinen cellulaire autoclavé. French.Partie 11: Prüfverfahren für Mauersteine . Croatia. en béton Porenbetonsteinen. manufactured stone and natural stone masonry units due to capillary action and the initial rate of water absorption of clay masonry units Méthodes d'essai des éléments de maçonnerie . Belgium. BS EN 772-11:2011 EUROPEAN STANDARD EN 772-11 NORME EUROPÉENNE EUROPÄISCHE NORM May 2011 ICS 91. 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. Cyprus. Denmark. 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. Czech Republic. ......................................................................................................................................................................4 3 Principle ..........................................................................................................................................5 7 Test procedure........................3 1 Scope .......................................................................................................................................................................................................................................................................BS EN 772-11:2011 EN 772-11:2011 (E) Contents Page Foreword .....................................4 4 Symbols ....................................................4 5 Apparatus......................................................................................................................................................................................................6 9 Evaluation of results ................................................................5 6 Preparation of specimens ......................................................................................................................................5 8 Calculation and expression of results ...................................................................................................6 10 Test report ...................................8 2 ........................................................................................................7 Annex A (informative) Significant technical changes between this European standard and the previous edition .................................................................................................................................................................4 2 Normative references ................................................................................................................................................... at the latest by November 2011. Annex A provides details of significant technical changes between this European Standard and the previous edition. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. Denmark. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. Italy. Netherlands. Ireland. Czech Republic. Hungary. Cyprus. Croatia. Slovenia. Spain. the secretariat of which is held by BSI. and conflicting national standards shall be withdrawn at the latest by November 2011. According to the CEN/CENELEC Internal Regulations. France. Portugal. 3 . Finland. BS EN 772-11:2011 EN 772-11:2011 (E) Foreword This document (EN 772-11:2011) has been prepared by Technical Committee CEN/TC 125 “Masonry”. Estonia. Poland. Latvia. Romania. Iceland. either by publication of an identical text or by endorsement. This European Standard shall be given the status of a national standard. Switzerland and the United Kingdom. Bulgaria. Luxembourg. Malta. Lithuania. This document supersedes EN 772-11:2000. Germany. Norway. Belgium. Greece. the national standards organizations of the following countries are bound to implement this European Standard: Austria. Slovakia. Sweden. For undated references. 2 Normative references The following referenced documents are indispensable for the application of this document. natural stone and manufactured stone masonry units the water absorption of face of the unit to be exposed is measured. (s). (g). Specification for masonry units — Part 3: Aggregate concrete masonry units (Dense and light- weight aggregates) EN 771-4. Specification for masonry units — Part 1: Clay masonry units EN 771-2. as described in the relevant product standard.BS EN 772-11:2011 EN 772-11:2011 (E) 1 Scope This European Standard specifies a method of determining the water absorption coefficient due to capillary action for aggregate concrete.s is the coefficient of water absorption due to capillary action for aggregate concrete autoclaved aerated concrete. [kg/(m × min)]. Specification for masonry units — Part 5: Manufactured stone masonry units EN 771-6. mso. 4 Symbols mdry. autoclaved aerated concrete. For dated references. natural stone and manufactured stone masonry units and the initial rate of water absorption for clay masonry units. natural stone and manufactured stone masonry units. EN 771-1. Specification for masonry units — Part 2: Calcium silicate masonry units EN 771-3. the latest edition of the referenced document (including any amendments) applies. 2 cwi. cw. 2 As is the gross area of the face of the specimen immersed in water.s is the mass of the specimen in grams after soaking for time t. In the case of clay masonry units the initial rate of absorption of the bed face is measured. a face of the masonry unit is immersed in water for a specific period of time and the increase in mass is determined. tso is the time of soaking. In the case of aggregate concrete. NOTE Specified in the relevant part of EN 771.s is the initial rate of water absorption for clay masonry units. autoclaved aerated concrete. Methods of test for masonry units — Part 16: Determination of dimensions 3 Principle After drying to constant mass.s is the mass of the specimen after drying. (g). only the edition cited applies. (mm ). Specification for masonry units — Part 4: Autoclaved aerated concrete masonry units EN 771-5. 4 . Specification for masonry units — Part 6: Natural stone masonry units EN 772-16. measure the dimensions of the faces to be immersed in accordance with the principle incorporated in EN 772-16 and calculate the gross area As. For natural stone masonry units. wipe off the water.1 % of their mass when dry. 5. cover the tank to avoid evaporation from the wet specimens. natural stone and manufactured stone units. EN 771-5 or EN 771-6 remove the specimens.1 Large tray of minimum depth of 20 mm and of plan area larger than the face of the masonry unit to be immersed.4) at a temperature of 70 °C ± 5 °C for aggregate concrete.4 Ventilated oven capable of maintaining a temperature of 70 °C ± 5 °C for aggregate concrete. Place the specimens with their faces (bed faces in the case of clay units) supported on a supporting device (5. autoclaved aerated concrete. After the immersion time (tso) specified in EN 771-1. Activate the timing device.2 Drying Dry the test specimens to constant mass mdry. then re-immerse them. 6 Preparation of specimens 6. 5. 7 Test procedure Allow the specimens to cool at room temperature.s). in which case that larger number shall be used.2 Supporting device of 400 mm2 maximum plan area to keep each specimen clear of the base of the tray.5 Weighing instrument capable of weighing the specimens to an accuracy of 0. wipe off surface water and weigh them (mso. autoclaved aerated concrete. For some clay masonry units the initial rate of water absorption can differ for the two bed faces. For natural stone masonry units record whether the test face is parallel or perpendicular to the bedding planes. BS EN 772-11:2011 EN 772-11:2011 (E) 5 Apparatus 5. Maintain the water level constant throughout the test. 5. in which case it will be necessary to measure on both faces. the loss in mass between the two determinations is not more than 0. When cool.1 Sampling The method of sampling shall be in accordance with the relevant part of EN 771. natural stone and manufactured stone units or 105 °C ± 5 °C for clay units. autoclaved aerated concrete. For aggregate concrete. 6. In 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. Constant mass is reached.1) and immerse in water to a depth of 5 mm ± 1 mm for the duration of the test. remove the specimens from the water at regular intervals. EN 771-4. natural stone and manufactured stone masonry units or 105 °C ± 5 °C for clay masonry units. if during the drying process in two subsequent weighings with a 24 h interval. but a larger minimum number may be specified in the product specification.2) so that they are clear of the base of the tray (5. weigh them. The minimum number of specimens shall be six. 5.1 % of the total mass.3 Stopwatch graduated in seconds. 5 . Continue this procedure until no further increase in mass is observed. fitted with a means of maintaining constant water level. EN 771-3.s in a ventilated oven (5. in seconds.s − mdry.5 the nearest 1 g/(m × s ) using the following formula: mso.s In the case of natural stone masonry units.1 kg/(m × min) using the following formula: mso.s − mdry. plot a graph of against the square root of the time As immersed.s −mdry.s c w. For clay masonry units calculate the mean of the initial rates of water absorption to the nearest 2 0.s c w.1 g/(m x s). 6 .2 Coefficient of water absorption due to capillary action of autoclaved aerated concrete and natural stone masonry units Calculate the coefficient of water absorption of the masonry units due to capillary action of each specimen to 2 0.3 Initial rate of water absorption of clay masonry units 2 Calculate the initial rate of water absorption of each clay masonry unit to the nearest 0.1 kg/(m × min).s using the following formula: mso.s c w.5 water absorption due to capillary action to the nearest 1 g/(m x s ).BS EN 772-11:2011 EN 772-11:2011 (E) 8 Calculation and expression of results 8.s = As ⋅t so [ ( ×10 6 g / m 2 ⋅ s )] 8. 8.i = As t [ ×10 3 kg / (m 2 × min ) ] where t = 1 min. Calculate cw.1g/m .1 Coefficient of water absorption due to capillary action of aggregate concrete and manufactured stone units Calculate the coefficient of water absorption of the masonry units due to capillary action to the nearest 2 0.s = [ ( ×10 6 g / m 2 × s 0.s − mdry.5 )] As t so mso.s as the gradient over the initial linear portion of the graph. For autoclaved aerated concrete and natural stone masonry units calculate the mean of the coefficients of 2 0. 9 Evaluation of results For aggregate concrete and manufactured stone masonry units calculate the mean of the coefficients of water 2 absorption due to capillary action to the nearest 0. j) remarks. h) for autoclaved aerated concrete and natural stone masonry units.1 kg/(m × min). e) number of specimens in the sample and whether these are whole units or representative portions thereof.1 g(m x s).1 kg/(m × min).5 absorption coefficient due to capillary action to the nearest 1 g/(m x s ) for each unit. title and date of issue of this European Standard.5 1 g/(m x s ). the length of time of 2 immersion and the mean water absorption coefficient due to capillary action to the nearest 0. and the mean of the initial rates of water absorption to the nearest 0. BS EN 772-11:2011 EN 772-11:2011 (E) 10 Test report The test report shall contain the following information: a) number. if any. the individual values of water 2 0. the individual values of initial rate of water absorption to the nearest 2 2 0. 7 . d) description of the specimens to the relevant part of EN 771. f) date of receipt of the specimens in the testing laboratory.1 g(m x s) for each unit. i) for clay masonry units. the length of time of immersion and the mean water absorption coefficient due to capillary action to the nearest 2 0. g) for aggregate concrete and manufactured stone masonry units. For natural stone masonry units state whether the test face was parallel or perpendicular to the bedding planes. c) date of testing (in the case of aggregate concrete. autoclaved aerated concrete and manufactured stone masonry units only). the individual values of water absorption 2 coefficient due to capillary action to the nearest 0. b) name of the organization that carried out the sampling and the method used. BS EN 772-11:2011 EN 772-11:2011 (E) Annex A (informative) Significant technical changes between this European standard and the previous edition The coefficient of water absorption of aggregate concrete and manufactured stone masonry units is now calculated to a new formula given in 8.2 had been applied to these types of units also. 8 .1. In the previous edition. the formula now given in 8. This page deliberately left blank . Licences can cover as few or as many users as you wish. 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