EN 846-2-2000 en Methods of Test for Ancillary Components for Masonry - Part 2 Determination of Bond Strength of Prefabricated Bed Joint Reinforcement in Mortar Joints《砖石结构辅助部件试验方法.pdf

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1、STD-BSI BS EN 4b-2-ENGL 2COO Lb2Ybb7 085400b 901 S BRITISH STANDARD Methods of test for ancillary components for masonry - Part 2: Determination of bond strength of prefabricated bed joint reinforcement in mort ar j oints The European Standard EN 84622000 has the status of a British Standard ICs 91.

2、080.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW CS EN 46-2:2000 STD-BSI BS EN 84b-2-ENGL 2000 Lb29bbS 0859007 898 = BS EN846-2:2000 been prepared under the direction of the Sector AmdNo. Committee for BUUding and Civil Engineering, was published under the authority of t

3、he Standards Committee and comes into effect on 15 June Zoo0 0 BSI 6-2000 ISBN0580 34889X National foreword Date Comments This British Standard is the officiai English language version of EN 846-22000 which is included in a package of new European Standards being prepared by CENEC 125 relating to an

4、cillary components for masonry - bed joint reinforcement. No British Standard is being superseded The UK participation in its preparation was entrusted by Technical committee M19, Masonry and associated tests, to Subcommittee B/519B, Ancillary components, which has the responsibility to: - aid enqui

5、rers to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK. A list of organizations represented

6、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 under the section entitled “International Standards Correspondence

7、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 application, Compliance with a British Standard does not of itsel

8、f 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 12, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document WaSlaStiSSUed. STD-ES1 BS

9、EN Bqb-Z-ENGL 2000 e lb24bb9 085Li008 78q EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 846-2 February 2000 ICs 91.060.10; 91.080.30 English version Methods of test for ancillary components for masonry - Part 2: Determination of bond strength of prefabricated bed joint reinforcement in mortar

10、 joints Mthodes dessai des composants accessoires de maonnerie - Partie 2: Dtermination de la rsistance de ladhrence des armatures dans les joints Prfverfahren fr Ergnzungsbauteile fr Mauerwerk - Teil 2: Bestimmung der Verbundfestigkeit der vorgefertigten Lagerfugenbewehrung This European Standard w

11、as approved by CEN on 4 December 1999. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this Europsan Standard the status of a national standard without any alteration. Upto-date lists and bibliographical references concerning uch na

12、tional standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by traislation under the responsibility of a CEN member into its own language and

13、notified to the Central Secretariat has the same status as tie 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, Switzerla

14、nd and United Kingdom. EUROPEAN COMMITEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FOR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels 0 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No

15、. EN 846-2:2000 E STD*BSI BS EN 84b-Z-ENGL 2000 = Lh24bb7 0854007 bLO Page 2 EN 846-2:2000 Contents Page Foreword . 3 1 Scope . 4 2 Normative references . 4 3 Principle 5 4 Symbols . 5 5 Materials 5 6 Apparatus . 6 7 Preparation and storage of test specimens . 9 8 Test Procedwe . 10 9 Expression of

16、results 11 10 Test rep0 rt 12 . Q BSI O-2000 STD-BSI BS EN 8i.lb-2-ENGL 2000 ILI LbZLibbS 085LiOLO 332 II Page 3 EN 846-22000 Foreword This European Standard has been prepared by Technical Committee CEN/TC 125, Masonry, the Secretariat of which is held by BSI. This European Standard shall be given t

17、he status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2000, and conflicting national standards shall be withdrawn at the latest by September 2000. According to the CENCENELEC Internal Regulations, the national standards organizations

18、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, Spain, Sweden, Switzerland and the United Kingdom. This European Standard has bee

19、n prepared under a mandate given to CEN by the European Commission and the European Free Trade Association and supports the essential requirements of the EU Construction Products Directive (89/1O/EEC) and includes the performance requirements referred to in the Eurocode for masonry structures. 8 BSI

20、 06-2000 Page 4 EN 846-22000 i Scope This European Standard specifies a method for determining the bond strength of prefabricated bed joint reinforcement in a masonry specimen made from specified units and mortar. This test method is applicable to designed prefabricated bed joint reinforcement compl

21、ying with prEN 845-3. The method is not applicable to alternative forms of reinforcement which may be used in masonry, for example bars. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited

22、at the appropriate places in the text and the publications are listed hereafter. For dated references, 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 o

23、f the publication referred to applies. prEN 77 1 - 1 prEN 77 1-2 prEN 77 1-3 prEN 77 1-4 prEN 77 1-5 prEN 77 1-6 prEN 772-1 EN 772-1 O prEN 845-3 prEN 998-2 EN 1015-3 Specification for masonry units - Part 1 : Clay masonry units. Specification for masonry units - Part 2: Calcium silicate masonry uni

24、ts. Specification for masonry units - Part 3: Aggregate concrete masonry units (dense and lightweight aggregates). Specification for masonry units - Part 4: Autoclaved aerated concrete masonry units. Specification for masonry units - Part 5: Manufactured stone masonry units. Specification for masonr

25、y units - Part 6: Natural stone masonry units. Methods of test for masonry units - Part 1 : Determination of compressive strength. Methods of test for masonry units - Part 10: Determination of moisture content of calcium silicate and autoclaved aerated concrete units. Specification for ancillary com

26、ponents for masonry - Part 3: Bed joint reinforcement. Specification for mortar for masonry units - Part 2: Masonry mortar. Methods of test for mortar for masonry - Part 3: Determination of consistence of fiesh mortar by flow table. Q BSI 06-2000 STD-BSI BS EN BVb-Z-ENGL 2000 E Lb24bb7 0854012 LO5 P

27、age 5 EN 846-2:2000 EN 1015-7 Methods of test for mortar for masonry - Part 7: Determination of air content of fresh mortar. prEN 101 5-1 1 Methods of test for mortar for masonry - Part 11 : Determination of flexural and compressive strength of hardened mortar, 3 Principle In this test, prefabricate

28、d bed joint reinforcement is embedded in mortar in a small wall of bonded masonry units. The reinforcement is then subjected to tension in order to determine its bond strength. 4 Symbols Fbk Fmem Fx(i.,) is the load capacity of individual bed joint reinforcement specimens, (N); S is the characterist

29、ic load capacity of the bed joint reinforcement, (N); is the mean load capacity of the bed joint reinforcement, (N); is the standard deviation of the log normal values for n- 1 degrees of freedom; k is a numerical factor; n is the number of specimens. 5 Materials 5.1 Masonry units 5.1.1 Conditioning

30、 The conditioning of masonry units shall be as specified. Record the method of conditioning the units prior to laying. Measure the moisture content by mass of autoclaved aerated concrete and calcium silicate masonry units in accordance with EN 772-10. Record the age of non-autoclaved concrete units

31、at the time of testing the masonry specimens. 5.1.2 Testing Determine the compressive strength of a sample of masonry units, using the method given in prEN772-1. For non-autoclaved concrete units determine the compressive strength at the time of testing the masonry specimens. Q BSI 06-2000 Page 6 EN

32、 846-212000 5.2 Mortar The mortar, its mixing procedure and its flow value shall conform to the requirements of prEN 998-2, unless otherwise specified, and these shall be reported in the test report. Take representative samples of fiesh mortar from the masons board to make mortar prisms to determine

33、 the flow value in accordance with EN 1015-3, and to determine the air content in accordance with EN 1015-7. Use the prism specimens to determine the mean compressive strength at the time of testing of the masonry specimens in accordance with prEN 1 O 15- 1 1. 6 Apparatus 6.1 Simple support, for hol

34、ding the test specimen such that the reaction is as close as possible to the centre line of the applied load. 6.2 Means of applying and maintaining on the test specimen a measured compressive load,providing a stress of between 0,05 N/mm2 and O, 1 N/mm2, accurate to *1 O %. The precompression platens

35、 shall be sufficiently stiff to distribute the applied load evenly. 6.3 Clamp, for gripping the free end of the prefabricated bed joint reinforcement and transmitting the load. Note: A possible arrangement is shown in Figure 1. Ideally the clamp should have serrated grooves for the wires to lie in a

36、nd the force should be applied using a small hydraulic ram. Q BSI 06-2000 STD-BSI BS EN Bqb-Z-ENGL 2000 = LbZ4bbS OB5iOLLI TBB ivi 0,6 b 8 1 4 Specimen of reinforcement Length of one cycle of the reinforcement Packing mortar Loading clamp Precompression platens Load cell to measure the precompressio

37、n force Small wall specimen Displacement measuring device Clamp Page 7 EN 846-2:2000 Figure 1- Specimen format and test arrangement for truss-type reinforcement O BSI 06-2000 STD.BS1 BS EN 84b-2-ENGL 2000 m Lb2Lfbb 0854015 71L( m Page 8 EN 846-22000 b 4 :w b I 181 4 Key 1 2 3 4 5 6 7 8 9 1 5 3 ;. -.

38、 .li- -_ I 7 II _ Y I Y I Specimen of reinforcement Length of one cycle of the reinforcement Packing mortar Loading clamp Precompression platens Load cell to measure the precompression force Small wall specimen Displacement measuring device Clamp Figure 2 - Specimen format and test arrangement for l

39、adder-type reinforcement 6.4 Test system, with a suitable load capacity. The load shall be measured using a device having a maximum error of 2 % of the full scale reading. The read-out shall be such that the maximum load reading or the reading at a specimen displacement of 0,l mm, whichever is the l

40、esser, occurs above 20 YO of the full scale reading. 6.5 Displacement measuring device, with a range of 10 mm and a maximum measuring error of 0,Ol mm. Q BSI 06-2000 STDDBSI BS EN 8Llb-2-ENGL 2000 S LbZLlbbS 0859OLb 50 S Page 9 EN 846-2:2000 7 Preparation and storage of test specimens 7.1 General At

41、 least five specimens of prefabricated bed joint reinforcement shall be tested. 7.2 Preparation Masonry specimens shall be constructed as specified incorporating a representative length of the prefabricated reinforcement. The representative length shall be taken to be: (1) for truss-type reinforceme

42、nt, one complete length of the diagonal cross wire of the reinforcement (0,5 b) plus 0,05 b additional embedment at either end; (2) for ladder-type reinforcement, a length containing one cross wire of the reinforcement as shown in Figure 2. The width of the specimen shall be chosen so as to allow a

43、minimum of 10 mm and a maximum of 50 mm lateral cover to both longitudinal wires. Products designed to be used in cavity or shell bedded masonry shall be tested in an appropriate specimen as shown in Figure 3. The specimen shall be constructed in and mortared up to a jig with a flat horizontal base

44、surface and an upstand such that the reaction faces are flat and perpendicular to the axis of the reinforcement. Measure and record the thickness of the mortar joint. 7.3 Storage Take appropriate steps to prevent the test specimen from drying out during the first three days after construction, e.g.

45、by covering with polyethylene sheets, and then leave uncovered in a laboratory environment until tested. Use a curing period of 7 days for thin layer mortars and 28 days for general purpose mortars. 8 BSI 06-2000 STDmBSI BS EN 84b-Z-ENGL 2000 Lb2Libb9 085LiO37 777 m Page 10 EN 846-22000 3 Figure 3 -

46、 Specimens for (a) divided joints and (b) cavity walls, showing only the lower layer of units and the position of the mortar layer (hatched). 8 Test procedure 8.1 Placing the specimen in the test machine At the end of the curing period place the specimens in the test machine such that the wire is ax

47、ial and aligned at the centre of action of the test system. 8.2 Test environment Carry out the tests at ambient laboratoq temperature. 8.3 Loading Apply the specified precompression load. Apply the tensile load smoothly, at the rates given in Table 1. Record the complete load displacement curve, the

48、 maximum load and the mode of failure. Acceptable modes of failure are: (1) one wire breaks, (2) both wires break, (3) wires pull out. If the mortar pulls out or the masonry splits the result shall be discarded and further specimens shall be tested until at least five results are obtained. O BSI 06-

49、2000 STD-BSI BS EN Bqb-Z-ENGL 2000 Lb24bbS O854038 b23 (NI 500 2 O00 5 O00 Page 11 EN 846-2:2000 whin) 200 800 2 O00 Table 1 - Maximum loading rates and increments I Anticipated minimum failure load I Maximum rate of load increase I Record the load capacity of each specimen, being the maximum load achieved or the load to cause a 1 mm deflection, whichever is the lesser. 9 Expression of results Calculate the mean load capacity (Fmem) as the arithmetic mean of the individual load capacities. Calculate the characte