SIST EN 14651:2005+A1:2008
(Main)Test method for metallic fibre concrete - Measuring the flexural tensile strength (limit of proportionality (LOP), residual)
Test method for metallic fibre concrete - Measuring the flexural tensile strength (limit of proportionality (LOP), residual)
This European Standard specifies a method of measuring the flexural tensile strength of metallic fibered concrete on moulded test specimen. The method provides for the determination of the limit of proportionality (LOP) and of a set of residual flexural tensile strength values.
This testing method is intended for metallic fibres no longer than 60 mm. The method can also be used for a combination of metallic fibres and, a combination of metallic fibres with other fibres.
Prüfverfahren für Beton mit metallischen Fasern - Bestimmung der Biegezugfestigkeit (Proportionalitätsgrenze, residuelle Biegezugfestigkeit)
Méthode d'essai du béton de fibres métalliques - Mesurage de la résistance a la traction par flexion (limite de proportionnalité (LOP), résistance résiduelle)
Preskusna metoda za beton s kovinskimi vlakni - Merjenje upogibne natezne trdnosti (meja proporcionalnosti (LOP), zaostale)
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Test method for metallic fibre concrete - Measuring the flexural tensile strength (limit of proportionality (LOP), residual)Preskusna metoda za beton s kovinskimi vlakni - Merjenje upogibne natezne trdnosti (meja proporcionalnosti (LOP), zaostale)Méthode d'essai du béton de fibres métalliques - Mesurage de la résistance a la traction par flexion (limite de proportionnalité (LOP), résistance résiduelle)Prüfverfahren für Beton mit metallischen Fasern - Bestimmung der Biegezugfestigkeit (Proportionalitätsgrenze, residuelle Biegezugfestigkeit)Ta slovenski standard je istoveten z:EN 14651:2005+A1:2007SIST EN 14651:2005+A1:2008en,fr,de91.100.30ICS:SLOVENSKI
STANDARDSIST EN 14651:2005+A1:200801-marec-2008
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14651:2005+A1
September 2007 ICS 91.100.30 Supersedes EN 14651:2005 English Version
Test method for metallic fibre concrete - Measuring the flexural tensile strength (limit of proportionality (LOP), residual)
Méthode d'essai du béton de fibres métalliques - Mesurage de la résistance à la traction par flexion (limite de proportionnalité (LOP), résistance résiduelle)
Prüfverfahren für Beton mit metallischen Fasern - Bestimmung der Biegezugfestigkeit (Proportionalitätsgrenze, residuelle Biegezugfestigkeit) This European Standard was approved by CEN on 3 April 2005 and includes Amendment 1 approved by CEN on 16 August 2007.
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 obtained on application to the CEN 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 CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
B-1050 Brussels © 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14651:2005+A1:2007: E
EN 14651:2005+A1:2007 (E) 2 Contents page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.4 4 Symbols and abbreviated terms.5 4.1 Symbols.5 4.2 Abbreviations.5 5 Principle.6 6 Apparatus.6 7 Test specimens.7 7.1 Shape and size of test specimens.7 7.2 Manufacture and curing of test specimens.7 7.3 Notching of test specimens.7 8 Testing procedure.8 8.1 Preparation and positioning of test specimens.8 8.2 Bending test.10 9 Expression of results.11 9.1 Equivalence between CMOD and deflection.11 9.2 Limit of proportionality.12 9.3 Residual flexural tensile strength.13 10 Test report.14 11 Precision.15 Annex A (informative)
Expressions for limit of proportionality and for residual flexural tensile strength.16
EN 14651:2005+A1:2007 (E) 3 Foreword This document (EN 14651:2005+A1:2007) has been prepared by Technical Committee CEN/TC 229 “Precast concrete products”, the secretariat of which is held by AFNOR. This document shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2008 and conflicting national standards shall be withdrawn at the latest by March 2008. This document includes Amendment 1, approved by CEN on 2007-08-16. This document supersedes EN 14651:2005. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". This standard is one of a series concerned with testing metallic fibered concrete. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, 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.
EN 14651:2005+A1:2007 (E) 4 1 Scope This European Standard specifies a method of measuring the flexural tensile strength of metallic fibered concrete on moulded test specimen. The method provides for the determination of the limit of proportionality (LOP) and of a set of residual flexural tensile strength values. This testing method is intended for metallic fibres no longer than 60 mm. The method can also be used for a combination of metallic fibres and, a combination of metallic fibres with other fibres. 2 Normative references The following referenced documents are 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 12350-1, Testing fresh concrete − Part 1: Sampling. EN 12390-1, Testing hardened concrete – Part 1: Shape, dimensions and other requirements for specimens and moulds. EN 12390-2, Testing hardened concrete – Part 2: Making and curing specimens for strength tests. EN 12390-4, Testing hardened concrete – Part 4: Compressive strength – Specification for testing machines. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 crack mouth opening displacement linear displacement measured by a transducer installed as specified in 7.1 and illustrated in Figure 4, on a prism subjected to a centre-point load F 3.2 deflection linear displacement measured by a transducer installed as specified in 7.1 and illustrated in Figure 5, on a prism subjected to a centre-point load F 3.3 limit of proportionality stress at the tip of the notch which is assumed to act in an uncracked mid-span section, with linear stress distribution, of a prism subjected to the centre-point load FL defined in 8.2 3.4 residual flexural tensile strength fictitious stress at the tip of the notch which is assumed to act in an uncracked mid-span section, with linear stress distribution, of a prism subjected to the centre-point load Fj corresponding to CMODj where CMODj > CMODFL or to δj where δj > δFL (j = 1,2,3,4)
EN 14651:2005+A1:2007 (E) 5 4 Symbols and abbreviated terms 4.1 Symbols CMODFL CMOD at LOP CMODj value of CMOD, j = 1, 2, 3 or 4 F load Fj load value, j = 1, 2, 3 or 4 FL load at LOP L length of test specimen M bending moment Mj bending moment value, j = 1, 2, 3 or 4
ML bending moment corresponding to the load at LOP b width of test specimen fR,j residual flexural tensile strength, j = 1, 2, 3 or 4 fct,Lf LOP hsp distance between the tip of the notch and the top of the test specimen in the mid-span section l length of span x width of notch y distance between bottom of test specimen and axis of displacement transducer δ deflection δFL deflection at LOP δj deflection value, j = 1, 2, 3 or 4 4.2 Abbreviations CMOD crack mouth opening displacement LOP limit of proportionality
EN 14651:2005+A1:2007 (E) 6 5 Principle The tensile behaviour of metallic fibre concrete is evaluated in terms of residual flexural tensile strength values determined from the load-crack mouth opening displacement curve or load-deflection curve obtained by applying a centre-point load on a simply supported notched prism. 6 Apparatus 6.1 Saw with rotating carborundum or diamond blade with adjustable and fixable cutting depth and 90° direction of saw-cut to the specimens lengths for notching the test specimens. 6.2 Calliper, capable of reading the dimensions of test specimens to an accuracy of 0,1 mm. 6.3 Rule, capable of reading the dimensions of test specimens to an accuracy of 1 mm. 6.4 Testing machine meeting the machine class 1 requirements in EN 12390-4, capable of operating in a controlled manner i.e. producing a constant rate of displacement (CMOD or deflection), and with sufficient stiffness to avoid unstable zones in the load-CMOD curve or load-deflection curve. 6.5 Device for transmitting the load of the testing machine to the test specimen, made up
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