1、BRITISH STANDARD BS EN 772-6:2001 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 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 772-6:2001 This B
2、ritish 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 Standards Policy and Strategy Committee on 04 December 2001 BSI 04 December 2001 ISBN 0 580 38770 4 National foreword Thi
3、s 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 concrete masonry units EN 771-3. These standards are the subject of transitional arrangements agreed unde
4、r 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 period will comprise a nominal nine month period during which any required changes to national regulation
5、s 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 At the end of this co-existence period, the national standard(s) will be withdrawn.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, the corresponding national standard to EN 772-6 and EN 771-3 is: BS 6073:1981, Precast concrete mas
6、onry units Specification for precast 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 EN 772-6 will commence upon the date of availability of this forthcoming harmonized EN 771-3. At the end of
7、 this period BS 6073:1981 will be withdrawn. NOTE Users of BS 6073:1981 should contact BSI Customer Services for confirmation of withdrawal. The UK participation in its preparation was entrusted by Technical Committee B/519, Masonry and associated tests, to Subcommittee B/519/1, Masonry units, which
8、 has the responsibility to: 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 in the BSI Standards Catalogue und
9、er 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 are responsible for their correct a
10、pplication. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor rela
11、ted international and European developments and promulgate them in the UK. 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 copyright date displayed in this document indicates when the docum
12、ent was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN 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 masonry uni
13、ts 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 on 18 Augu
14、st 2001. 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. Up-to-date lists and bibliographical references concerning such national standards may be obta
15、ined 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 Management Cen
16、tre 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. EUROPEAN
17、COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 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 EEN 772-6:2001 (E) 2
18、 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 report6EN 772-6:2001 (E) 3 Foreword This European Standard has been prepared by Technical Committee CEN/TC 125, Maso
19、nry, 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 latest by June 2003. Accordin
20、g 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, Netherlands, Norway, Portugal, S
21、pain, Sweden, Switzerland and the United Kingdom.EN 772-6:2001 (E) 4 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 10, in accordance with pr
22、EN 771-3. 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 references, subsequent amendments
23、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 masonry units Part 3: Aggregate
24、concrete masonry units (dense and lightweight aggregates). 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. 3 Principle The principle o
25、f this test is to measure the bending tensile strength of concrete units by a flexural test. 4 Symbols R tf is the bending tensile strength of the specimen, in Newton per square millimetres (N/mm 2 ) F is the failure load, in Newton (N) l is the distance between supports, in millimetres (mm) b is th
26、e 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 1015-11. The bending device shall consist of two roller supports having the same diameter between 15 and 40 mm, on which the specimen rests,
27、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.EN 772-6:2001 (E) 5 To allow a uniform distrib
28、ution 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 0,1 % of their mass. 6 Preparation
29、 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 under the following conditions: Rela
30、tive humidity 65 % Temperature 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 sampling shall be stated in the test report.
31、 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. Measure height h and width b of the cross sect
32、ion at the location of fracture to the nearest 0,1 mm. 8 Calculation of results Calculate the tensile bending strength of each specimen to the nearest 0,1 N/mm 2using the formula: bh Fl = R 2 tf The position of the failure shall be noted in the report. If the fracture occurs in the tension surface o
33、utside 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 the nearest 0,1 N/mm 2 .EN 772-6:2001 (E)
34、 6 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, origin and designation of the masonry un
35、it 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 of rollers; i) the failure load in N, pos
36、ition of failure, strength in N/mm 2to the nearest 0,1 N/mm 2and dimensions in mm of each specimen. Note any discarded results; j) the mean bending tensile strength in N/mm 2to the nearest 0,1 N/mm 2 ; k) remarks, if any.blankBS EN 772-6:2001 BSI 389 Chiswick High Road London W4 4AL BSI British Stan
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