1、BRITISH STANDARD Methods of test for masonry - Part 4: Determination of shear strength including damp proof course The European Standard EN 105242000 has the status of a British Standard ICs 91.080.30 IS EN O5242000 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITED BY COPYBIGI LAW STD*BSI BS EN L
2、052-Li-ENGL 2000 W Lb2Libb7 0870288 TLib M BS EN 1062-4:2000 Amd.No. This British Standard, having been prepared under the direction of the Sector Committee for Buiidng and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 September 2000 Date
3、 Comments Q BSI 09-2000 ISBN O 580 36530 1 National foreword This British Standard is the official Engiish language version of EN 10524:2. The UK participation in its preparation was entrusted by Technical Committee M19, Masonry and associated tests, to Subcommittee B/519/4, Tests, which has the res
4、ponsibility 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 UK interests informed; - monitor related intern - the cross-sectional area Ai of the specimens parallel to the shear forc
5、e with an accuracy of 1 %; - the precompression load F,i; - the load Fi, where failure of one of the bed joints occurs; - the mode of failure, e.g. slipping along damp proof course or material failure within the damp proof course. 8 BSI 09-2000 STD-BSI BS EN L052-V-ENGL 2000 Lb24bb7 0870277 T57 m Pa
6、ge 9 EN 1052-42000 8.4 Replications If failure is by shear failure in the unit parallel with the bed joint or crushing or splitting of the units, then either further specimens may be tested until three shear failures for each precompression level have been achieved or alternatively the result may be
7、 used as a lower bound to the shear strength. However, circumstances may be such that the use of an alternative unit is appropriate. 9 Calculations For each specimen at each compressive stress calculate the shear strength to the nearest 0,Ol N/md using the following formula: Calculate the precompres
8、sive stress at each precompression load as: Fpi 2 fpi =-N/mm Ai 10 Evaluation of results Plot a graph of the individual shear strengthfvi against the normal compressive stresshi as shown in Figure 2. Plot the line determined from a linear regression of the points. Record the mean initial shear stren
9、gth b) name of the testing laboratory; c) number of specimens; d) date of building the specimens; e) curing conditions (e.g. time, temperature, humidity); f) date of testing the specimens; g) laboratory temperature range during test period; h) description of the specimens including dimensions; Q BSI
10、 09-2000 STD-BSI BS EN L052-4-ENGL 2000 1b24bb9 0870297 821 Page 11 EN 1052-42000 i) description of the masonry units and the mortar (to include also details of the mortar mixing procedure and flow value, air content and compressive strength), preferably consisting of the appropriate test reports, o
11、r of extracts taken from these reports; j) description of damp proof course materiais (test certifications); k) age of non-autoclaved concrete units at the time of testing the specimens; 1) moisture content by mass of autoclaved aerated concrete and calcium silicate units at the time of laying or, f
12、or other types of unit, the method of conditioning prior to the time of laying; m) compressive load at the beginning of testing and at the moment of failure; n) maximum shear load reached by the test specimens; o) individual values for the shear strength a precompression stress for each specimen in
13、N/mm2 to the nearest 0,O 1 N/mm2 and the description of the failure mechanism of each specimen; p) mean and characteristic initial shear strength in N/mm2 to the nearest 0,Ol N/mmz; q) angle of internal friction and characteristic angle of internal fiction; r) remarks, if any. Q BSI 09-2000 STD-BSI
14、BS EN 1052-4-ENGL 2000 W lbZLlbb9 0870300 373 = Page 12 EN 1052-42000 Bibliography prEN 772- 16 Methods of test for masonry units - Part 16: Determination of dimensions. prEN772-20 Methods of test for masonry units - Part 20: Determination of flatness of faces of aggregate concrete, manufactured sto
15、ne and natural stone masonry units. Q BSI 09-2000 STDOBSI BS EN L052-4-ENGL 2000 E lb24bb7 0870301 ZUT BS EN 1052-42000 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK vi
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