1、BRITISH STANDARDBS EN14488-5:2006Testing sprayed concrete Part 5: Determination of energy absorption capacity of fibre reinforced slab specimensThe European Standard EN 14488-5:2006 has the status of a British StandardICS 91.100.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g
2、40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 14488-5:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 April 2006 BSI 2006ISBN 0 580 48236 7Natio
3、nal forewordThis British Standard is the official English language version of EN 14488-5:2006.The UK participation in its preparation was entrusted by Technical Committee B/517, Concrete, to Subcommittee B/517/10, Sprayed concrete, which has the responsibility to: A list of organizations represented
4、 on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or
5、by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immun
6、ity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in t
7、he UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date
8、CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14488-5April 2006ICS 91.100.30English VersionTesting sprayed concrete - Part 5: Determination of energyabsorption capacity of fibre reinforced slab specimensEssais pour bton projet - Partie 5: Dtermination de lacapacit dabsorption de lnergie
9、dune dalle-prouvetterenforce par des fibresPrfung von Spritzbeton - Teil 5: Bestimmung derEnergieabsorption bei faserverstrkten plattenfrmigenPrfkrpernThis European Standard was approved by CEN on 27 February 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipul
10、ate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists
11、 in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies o
12、f Austria, Belgium, 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 F
13、OR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14488-5:2006: EEN 14488-5:2006 (E) 2 Contents P
14、age Foreword3 1 Scope 4 2 Normative references 4 3 Principle4 4 Apparatus .4 4.1 Testing machine.4 4.2 Load application 4 4.3 Deflection measurement and control 5 5 Test specimen5 6 Procedure .5 6.1 Preparation and positioning of specimens.5 6.2 Loading .5 7 Expression of results 5 8 Test report 6 9
15、 Accuracy.6 EN 14488-5:2006 (E) 3 Foreword This European Standard (EN 14488-5:2006) has been prepared by Technical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publica
16、tion of an identical text or by endorsement, at the latest by October 2006, and conflicting national standards shall be withdrawn at the latest by December 2007. This European Standard is part of a series of standards concerning testing sprayed concrete. This series EN 14488 Testing sprayed concrete
17、 includes the following parts: Part 1: Sampling fresh and hardened concrete Part 2: Compressive strength of young sprayed concrete Part 3: Flexural strengths (first peak, ultimate and residual) of fibre reinforced beam specimens Part 4: Bond strength of cores by direct tension Part 5: Determination
18、of energy absorption capacity of fibre reinforced slab specimens Part 6: Thickness of concrete on a substrate Part 7: Fibre content of fibre reinforced concrete According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement t
19、his European Standard: Austria, Belgium, 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 Kingd
20、om. EN 14488-5:2006 (E) 4 1 Scope This part of European Standard specifies a method for the determination of the load/deflection response of a slab specimen in order to calculate the energy absorption capacity up to a specified deflection. 2 Normative references The following referenced documents ar
21、e 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 12390-2, Testing hardened concrete - Part 2: Making and curing specimens for streng
22、th tests EN 12390-4:2000, Testing hardened concrete Part 4: Compressive strength Specification for testing machines EN 14488-1, Testing sprayed concrete - Part 1: Sampling fresh and hardened concrete 3 Principle A fibre reinforced slab specimen, sprayed in accordance with EN 14488-1 is subject to a
23、load, under deflection control, through a rigid steel block positioned at the centre of the slab. The load-deflection curve is recorded and the test is continued until a deflection of at least 30 mm is achieved at the centre point of the slab. From the load-deflection curve a second curve is calcula
24、ted giving the absorbed energy as a function of the slab deflection. 4 Apparatus 4.1 Testing machine 4.1.1 The test shall be carried out using a testing machine conforming to 4.2 and 4.3 of EN 12390-4:2000. 4.1.2 The stiffness and control system of the testing machine shall be such that the test can
25、 be displacement controlled. The stiffness of the load system (including frame, load cell, loading block and support frame) shall be at least 200 kN/mm. 4.1.3 A calibrated electronic transducer with a resolution of at least 0,02 mm. 4.1.4 An electronic data logger or XY plotter. 4.2 Load application
26、 The device for applying the load shall consist of: A frame with a rigid square support (20 1) mm thick and (500 2) mm x (500 2) mm internal dimension supporting the slab. A rigid steel square loading block having a contact surface of (100 1) mm x (100 1) mm and thickness of (20 1) mm, positioned at
27、 the centre of the upper face of the slab (see Figure 1). EN 14488-5:2006 (E) 5 A suitably stiff bedding material to be applied between the sample and both the loading block and the square support. NOTE Suitable materials are mortar and plaster. 4.3 Deflection measurement and control 4.3.1 Bending d
28、eflection at the centre of the slab, relative to the frame support shall be measured by means of an electronic transducer. 4.3.2 The testing machine shall be displacement controlled at a constant rate. 5 Test specimen 5.1 A square specimen shall be produced from a panel, sprayed and cured in a mould
29、, in accordance with EN 14488-1, with dimensions of 600 mm x 600 mm and trimmed to a thickness of 10050+mm immediately after spraying. 5.2 The prepared slab shall be cured under conditions according to EN 12390-2, for a minimum of 3 d immediately before testing and kept moist until testing. 5.3 Test
30、ing shall normally be performed at 28 d. 5.4 The specimens shall be examined and any abnormality observed shall be reported. 6 Procedure 6.1 Preparation and positioning of specimens 6.1.1 The load shall be applied to the sprayed face, the smooth moulded side of the test slab being on the bottom duri
31、ng the test. 6.1.2 The moulded face shall be bedded with the bedding material at the location of contact with the supporting frame. Also the loading block shall be bedded onto the slab so that it is perpendicular to the applied load. 6.2 Loading 6.2.1 The testing machine shall be displacement contro
32、lled at a constant rate of (1 0,1) mm/min at the centre of the slab. 6.2.2 The test shall be finished when the central deflection exceeds 30 mm. 6.2.3 The load and deflection shall be continuously recorded with the data logger or XY plotter until a deflection of at least 30 mm is obtained (see Figur
33、e 2). 7 Expression of results From the load-deflection curve the energy diagram giving the work performed as a function of displacement shall be calculated (see Figure 3). The energy absorption capacity in joules is reported as the area under the load-deflection curve between 0 and 25 mm deflection.
34、 EN 14488-5:2006 (E) 6 8 Test report The report shall include: a) identification of the test specimen; b) shape and dimensions of slab (diameter or width) to the nearest millimetre; c) average thickness of the slab, evaluated to within 1 mm, at the location of the loading block; d) sketch or photogr
35、aph showing number and location of the cracks; e) type and stiffness of the testing machine; f) load-deflection curve; g) maximum load in kN; h) calculated energy-deflection diagram; i) energy absorption capacity to nearest 10 J; j) any deviation from this standard; k) a declaration from the person
36、technically responsible for the test that the testing was carried out in accordance with this standard, except as detailed in item j). NOTE The report may also include, if known: - conditions of specimen at receipt; - curing conditions; - age of specimen at test. 9 Accuracy Currently no accuracy dat
37、a are available for this test EN 14488-5:2006 (E) 7 Figure 1 Arrangement of loading of test specimen Key A Load in KN B Deflection at centre in mm Figure 2 Example of load/deflection curve EN 14488-5:2006 (E) 8 Key A Energy in joules (10) B Deflection at centre in mm E Energy absorption capacity Fig
38、ure 3 Example of energy/deflection curve blankBS EN 14488-5:2006BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is
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