BS EN 772-1-2011 Methods of test for masonry units Determination of compressive strength《砌块的试验方法 抗压强度的测定》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 772-1:2011Methods of test for masonryunitsPart 1: Determination of compressivestrengthLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 26/07/2011 08:00, Uncontrolled

2、Copy, (c) BSIBS EN 772-1:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 772-1:2011. Itsupersedes BS EN 772-1:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/519/1, Masonry units.A list of organizations

3、represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 70257 0ICS 91.100.25Compliance with a British Standard cannot conf

4、er immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 May 2011.Amendments issued since publicationDate Text affectedLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 26/07/2011 08:00, Uncontrolled Copy, (c)

5、BSIBS EN 772-1:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 772-1 May 2011 ICS 91.100.25 Supersedes EN 772-1:2000English Version Methods of test for masonry units - Part 1: Determination of compressive strength Mthodes dessai des lments de maonnerie - Partie 1: Dtermination de la rsistan

6、ce la compression Prfverfahren fr Mauersteine - Teil 1: Bestimmung der Druckfestigkeit 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

7、 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

8、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

9、, 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

10、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 772-1:2011: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA ST

11、ANDARDS, 26/07/2011 08:00, Uncontrolled Copy, (c) BSIBS EN 772-1:2011EN 772-1:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Principle 44 Symbols 45 Materials .56 Apparatus .57 Preparation of specimens .58 Procedure .99 Calculation and expression of results 1010 Evaluation of

12、results 1011 Test report . 10Annex A (informative) Conversion of the compressive strength of masonry units to the normalised compressive strength 12Annex B (normative) Surface preparation and conditioning of units . 13Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 26/07/2011 08:00, Uncontrol

13、led Copy, (c) BSIBS EN 772-1:2011EN 772-1:2011 (E) 3 Foreword This document (EN 772-1:2011) 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 ide

14、ntical 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 shall not be h

15、eld responsible for identifying any or all such patent rights. This document supersedes EN 772-1:2000. There have been no technical changes compared to EN 772-1:2000. The opportunity has been taken to introduce a normative Annex B which includes the methods of surface preparation and conditioning fo

16、r each unit type. This information was previously available in the product specifications only, consequently EN 771-1 now becomes a stand-alone document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Eur

17、opean Standard: 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, Sweden, Switzerland and

18、the United Kingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 26/07/2011 08:00, Uncontrolled Copy, (c) BSIBS EN 772-1:2011EN 772-1:2011 (E) 4 1 Scope This European Standard specifies a method for determining the compressive strength of masonry units. 2 Normative references The following

19、 referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 771-1, Specification for masonry units Part 1: Clay masonry

20、 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 units (dense and light-weight aggregates) EN 771-4, Specification for masonry units Part 4: Autoclaved aerated concrete masonry units E

21、N 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 EN 772-2, Methods of test for masonry units Part 2: Determination of percentage area of voids in aggregate concrete masonry units (by paper

22、indentation) EN 772-10, Methods of test for masonry units Part 10: Determination of moisture content of calcium silicate and autoclaved aerated concrete units EN 772-13, Methods of test for masonry units Part 13: Determination of net and gross dry density of masonry units (except for natural stone)

23、EN 772-16, Methods of test for masonry units Part 16: Determination of dimensions EN 1015-11, Methods of test for mortar for masonry Part 11: Determination of flexural and compressive strength of hardened mortar EN ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method (ISO 6507-1:

24、2005) 3 Principle The specimens, after preparation, when needed, are laid and centred on the platen of a compression testing machine. A uniformly distributed load is applied and increased continuously up to failure. 4 Symbols fb normalised compressive strength of masonry unit (N/mm2); d shape factor

25、 multiplier used to convert the air-dry compressive strength of the masonry specimens to the normalised compressive strength. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 26/07/2011 08:00, Uncontrolled Copy, (c) BSIBS EN 772-1:2011EN 772-1:2011 (E) 5 5 Materials Sand with a maximum grain s

26、ize of 1 mm. Cement 6 Apparatus 6.1 Testing machine that conforms to the requirements of Table 1. Table 1 Requirements for testing machines Maximum permissible repeatability of forces as percentage of indicated force % Maximum permissible mean error of forces as percentage of indicated force % Maxim

27、um permissible error of zero force as percentage of maximum force of range % 2,0 2,0 0,4 The testing machine shall have adequate capacity to crush all the test specimens, but the scale used shall be such that the failure load on the specimen exceeds one-fifth of the full scale reading. The machine s

28、hall be provided with a load-pacer or equivalent means to enable the load to be applied at the rate given in 8.2. The testing machine shall be equipped with two steel-bearing platens. The stiffness of the platens and the manner of load transfer shall be such that the deflection of the platen surface

29、s at failure load shall be less than 0,1 mm measured over 250 mm. The platens shall either be through hardened or the faces case hardened. The testing faces shall have a Vickers hardness of at least 600 HV when tested in accordance with EN ISO 6507-1. One platen of the machine shall be able to align

30、 freely with the specimens as contact is made, but shall be restrained by friction or other means from tilting during loading. The other platen shall be a plane non-tilting block. The bearing faces of both platens shall be larger than the size of the largest specimen to be tested. Where auxiliary pl

31、atens are used, they shall be properly located and of the same hardness, stiffness and planeness as the main platens. The bearing surfaces of the platens shall not depart from a plane by more than 0,05 mm. 6.2 Weighing instrument capable of weighing specimens to an accuracy of 0,1 % of their mass. 6

32、.3 Sufficient stiff steel strips for use on shell bedded or strip bedded ground units (See 8.1). 7 Preparation of specimens 7.1 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 sp

33、ecified in the product specification, in which case that larger number shall be used. In the case of large masonry units representative portions, e.g. cubes, may be cut from the masonry unit in different positions as stated in the relevant part of EN 771 (see also Note to 7.2.4). Licensed Copy: Wang

34、 Bin, ISO/EXCHANGE CHINA STANDARDS, 26/07/2011 08:00, Uncontrolled Copy, (c) BSIBS EN 772-1:2011EN 772-1:2011 (E) 6 7.2 Surface preparation 7.2.1 General Specimens shall be tested in the orientation specified, and this shall be stated in the test report. For certain forms of construction, it will be

35、 necessary to test the masonry units in more than one orientation. Where grinding in accordance with 7.2.4 significantly alters the contact surface or reduces the height significantly alternative approaches are required, see 7.2.4. Where it is not practicable to prepare clay HD units by grinding e.g

36、. high strength units, the surface preparation may be carried out by capping in accordance with 7.2.5 After the removal of any superfluous material, e.g. flashing from the production process, the faces of the specimen, whether a whole masonry unit or a piece cut from a larger unit (see 7.1), through

37、 which the load is to be applied, shall be plane to a tolerance of 0,1 mm in any 100 mm and such that the top surface lies between two parallel planes which are parallel to the bottom surface, and not greater than 1 mm apart for every 100 mm. If the test faces of the masonry unit as manufactured, or

38、 the piece cut from a larger unit, fail to achieve this specification, then prepare the surfaces either by grinding (see 7.2.4) or by capping (see 7.2.5). Masonry units containing frogs, and not required to be capped, shall additionally be treated as given in 7.2.3. If the specimens contain grooves

39、or tongues first prepare them as given in 7.2.2. Test specimens shall be prepared in accordance with Annex B. State the method of surface preparation in the test report. 7.2.2 Removal of tongues and grooves Remove any tongues and/or grooves on the test faces of units prior to testing. If pieces are

40、to be cut from larger units, arrange the cutting so that any tongues and/or grooves are eliminated. 7.2.3 Preparation of masonry units containing frogs and which are not to be capped For masonry units with frogs that are assessed to have a net loaded area of more than 35 % of the bed face, test them

41、 without removing or filling the frogs. Where the net loaded area of masonry units with frogs is less than or equal to 35 % of the gross area then the frogs shall be filled with mortar of the same kind as used for capping (see 7.2.5) and the curing shall be carried out in accordance with the require

42、ments of 7.2.5.4. 7.2.4 Grinding Grind the surfaces of the specimen until the requirement for planeness and parallelism given in 7.2.1 is achieved. However, if the masonry units have frogs, indented lettering, cavities, perforations, internal or external holes, leave these in place. If the grinding

43、process would significantly alter the contact area of the tested faces then the capping procedure of 7.2.5 shall be followed. If the remaining height of the specimens after they are ground is less than 40 mm or the height/width ratio less than 0,4, then make up a composite specimen by placing one up

44、on the other without using any mortar or binding material or separating layer(s) between them. NOTE Where a composite specimen is made up from more than one ground unit, this should be considered as a single specimen providing a single test result. Accordingly, a greater number of masonry units than

45、 that specifically stated in EN 771 will be necessary in order to provide the required number of test results. 7.2.5 Capping 7.2.5.1 Capping of masonry units without voids or with voids unfilled Use a cement/sand capping mortar expected to attain a minimum compressive strength, when tested in accord

46、ance with EN 1015-11, at the time of testing the specimens, at least that of the expected masonry unit strength or 30 N/mm2, whichever is the lesser. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 26/07/2011 08:00, Uncontrolled Copy, (c) BSIBS EN 772-1:2011EN 772-1:2011 (E) 7 If necessary, e

47、.g. for units with high water absorption characteristics, first moisten the surfaces to be capped. Bed each specimen on a smooth rigid plate of ground glass or stainless steel which does not depart from a true plane surface by more than 0,1 mm in any 100 mm. A suitable method is as follows: Support

48、the plate firmly with the machined face uppermost and level it in two directions at right angles using a spirit level. Coat the plate with a film of mould release oil or a sheet of thin paper or plastic film to prevent mortar adhering to the plate. Place a uniform layer of mortar about 5 mm thick on

49、 the plate about 25 mm longer than the unit and about 10 mm wider. Press one bed face of the specimen firmly into the layer so that the vertical axis of the specimen is perpendicular to the plane of the plate. Check this condition by using a square or spirit level held against each of the four vertical faces of the specimen in turn. Ensure that the thickness of the mortar bed is at least 3 mm over the whole area and that any cavity in the bed face normally filled when the masonry units are