1、Methods of test for masonry units - Part 6: Determination of bending tensile strength of aggregate concrete masonry units The European Standard EN 772-6:2001 has the status of a British Standard ICs 91.100.30 BS EN 772-61200 1 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS
2、 EN 772-612001 Amd.No. O BSI 04 December 2001 ISBN O 580 38770 4 National foreword Date Comments This British Standard is the official English language version of EN 772-6:2001. EN 772-6 is a supporting standard to the forthcoming harmonized European product standard specification on aggregate concr
3、ete masonry units EN 771 -3. These standards are the subject of transitional arrangements agreed under the Commission mandate. The Member States have agreed a nominal transition period for the Co-existence of these standards and their corresponding national standard(s). It is intended that this peri
4、od will comprise a nominal nine month period during which any required changes to national regulations are to be made, followed by a further nominal twelve month period for the implementation of CE marking. At the end of this Co-existence period, the national standard(s) will be withdrawn. In the UK
5、, the corresponding national standard to EN 772-6 and EN 77 1-3 is: - B S 6073 : 19 8 1, Precast concrete masonry units SpeciJicafion forprecast concrete masonry units. As EN 772-6 is a supporting standard to the forthcoming harmonized EN 771-3, the nominal transition period of twenty-one months for
6、 EN 772-6 will commence upon the date of availability of this forthcoming harmonized EN 77 1-3. At the end of this period BS 6073:1981 will be withdrawn. NOTE Users of BS 6073: 198 1 should contact BSI Customer Services for confirmation of withdrawal. The UK participation in its preparation was entr
7、usted by Technical Committee B/519, Masonry and associated tests, to Subcommittee B/5 19/1, Masonry 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
8、 UK interests informed; monitor related international and European developments and promulgate them in the UK. - - This British Standard, having been prepared under the direction of the Sector Policy and Strategy Committee for Building and Civil Engineering, was published under the authority of the
9、Standards Policy and Strategy Committee on 04 December 200 1 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 i
10、n the BSI Standards Catalogue under the section entitled “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 ar
11、e responsible for their correct application. Compliance 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 to 6, an inside back cover and a back cover. The BSI co
12、pyright date displayed in this document indicates when the document was last issued. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 772-6 September 2001 ICs 91.100.30 English version Methods of test for masonry units - Part 6: Determination of bending tensile strength of aggregate concrete mas
13、onry units Mthodes dessai des lments de maonnerie - Partie 6: Dtermination de la rsistance la traction par flexion des lments de maonnerie en bton de granulats Prfverfahren fr Mauersteine -Teil 6: Bestimmung der Biegezugfestigkeit von Mauersteinen aus Beton This European Standard was approved by CEN
14、 on 18 August 2001 CEN members are bound to comply with the CENKENELEC Internal Regulations 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 ma
15、y be obtained on application to the Management Centre or to any CEN member. This European 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 Manag
16、ement Centre has the same status as the official versions. CEN members are the national 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.
17、EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2001 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 772-6:2001 E EN 772-
18、612001 (E) Content Page Foreword 3 1 Scope . 4 2 Normative references . 4 3 Principle 4 4 Symbols . 4 5 Apparatus . 4 6 Preparation of specimens . 5 7 Test procedure . 5 8 Calculation of results . 5 9 Test report 6 2 EN 772-612001 (E) Foreword This European Standard has been prepared by Technical Co
19、mmittee 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 March 2002, and conflicting national standards shall be withdrawn at the lates
20、t by June 2003. 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, Luxembourg, Netherla
21、nds, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 3 EN 772-612001 (E) 1 Scope This European Standard specifies a method of determining the bending tensile strength of aggregate concrete masonry units having a width less than 100 mm and a ratio of length to width greater than
22、1 O, in accordance with prEN 77 1-3. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated referen
23、ces, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies (including amendments). prEN 771-3, Specification for mason
24、ry units - Part 3: Aggregate concrete masonry units (dense and lightweight aggregates). EN 772- 16, Methods of test for masonry units - Part 16: Determination of dimensions. EN 1015-1 1, Methods of test for mortar for masonry - Part II: Determination of flexural and compressive strength of hardened
25、mortar. 3 Principle The principle of this test is to measure the bending tensile strength of concrete units by a flexural test. 4 Symbols Rtf is the bending tensile strength of the specimen, in Newton per square millimetres (N/mm2) F is the failure load, in Newton (N) 1 is the distance between suppo
26、rts, in millimetres (mm) b is the specimen width in millimetres (mm) h is the specimen height, in millimetres (mm) 5 Apparatus 5.1 Test machine of appropriate capacity, in accordance with EN 1015-1 1. The bending device shall consist of two roller supports having the same diameter between 15 and 40
27、mm, on which the specimen rests, and two upper rollers of the same diameter, through which the load is applied. The distance between the two support rollers should be at least 4 times the height of the specimen. The two upper rollers should be positioned at the third points of the span. 4 EN 772-612
28、001 (E) To allow a uniform distribution of the forces on the specimen, all rollers except one shall be able to oscillate slightly about their centre, in a vertical plane perpendicular to the major axis of the specimen. 5.2 Weighing instrument capable of weighing specimens to an accuracy of at least
29、0,l % of their mass. 6 Preparation of specimens The minimum number of specimens shall be three, but a larger minimum number may be specified in the product specification, in which case that larger number shall be used. Whole unit test specimens shall be conditioned by air drying in an environment un
30、der the following conditions: Relative humidity I65 % Temp erature 2 15 “C Duration 14 days If during the conditioning process the loss in mass in consecutive weighings at not less than 24 h intervals, is less than 1 % of the mass of the unit, the unit may be regarded as air dry. The method of sampl
31、ing shall be stated in the test report. Measure the dimensions of the specimens in accordance with EN 772- 16. 7 Test procedure Apply the load gradually and without shock at any convenient rate such that failure occurs within 30 s to 90 s. Record the maximum load (P), and position of failure. Measur
32、e height h and width b of the cross section at the location of fracture to the nearest 0,l mm. 8 Calculation of results Calculate the tensile bending strength of each specimen to the nearest O, 1 N/mm2 using the formula: FI bh2 R =- tf The position of the failure shall be noted in the report. If the
33、 fracture occurs in the tension surface outside of the middle third of the span length, the test result should be discarded. Three, or the larger number of specimens referred to in clause 6, results shall be determined. Calculate the tensile bending strength as the mean of the individual results to
34、the nearest O, 1 N/mm2. 5 EN 772-612001 (E) 9 Test report The test report shall contain the following information: a) the number, title and date of issue of this European Standard; b) the name of the organization that carried out the sampling and the method used; c) the date of testing; d) the type,
35、 origin and designation of the masonry unit by reference to prEN 771-3; e) the number of specimens in the sample; f) the date of receipt of the specimens in the testing laboratory g) the age of the specimens (if known); h) a sketch of the specimen showing the orientation of loading and the position
36、of rollers; i) the failure load in N, position of failure, strength in N/mm2 to the nearest 0,l N/mm2 and dimensions in mm of each specimen. Note any discarded results; j) the mean bending tensile strength in N/mm2 to the nearest O, 1 N/mm2; k) remarks, if any. 6 BS EN 772-61200 1 B SI 3 89 Chiswick
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