EN 14651:2005+A1:2007

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 à 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)

General Information

• Status: Published
• Publication Date: 25-Sep-2007
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: CEN/TC 229 - Precast concrete products
• Drafting Committee: CEN/TC 229/WG 3 - Products for which the stability requirements is not dominant
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 05-Dec-2022
• Completion Date: 14-Apr-2025
• Ref Project: SIST EN 14651:2005+A1:2008 - Test method for metallic fibre concrete - Measuring the flexural tensile strength (limit of proportionality (LOP), residual)

Relations

• Merged From: EN 14651:2005 - Test method for metallic fibered concrete - Measuring the flexural tensile strength (limit of proportionality (LOP), residual)
• Effective Date: 18-Jan-2023

Overview

EN 14651:2005+A1:2007 is the CEN test method for measuring the flexural tensile strength of metallic fibre concrete. The standard prescribes how to test notched, moulded prisms to determine the limit of proportionality (LOP) and a set of residual flexural tensile strength values from load–CMOD (crack mouth opening displacement) or load–deflection curves. It applies to metallic fibres up to 60 mm long and can be used for mixes containing metallic fibres alone or in combination with other fibres.

Key topics and technical requirements

• Specimen geometry: nominal prism cross-section 150 mm × 150 mm; specimen length 550–700 mm; span between supporting rollers = 500 mm.
• Notch: wet sawed at mid-span; notch width ≤ 5 mm; distance from notch tip to top (hsp) = 125 mm ± 1 mm.
• Loading rig: two supporting rollers and one loading roller, steel rollers Ø 30 mm ± 1 mm; testing machine compliant with EN 12390-4 (machine class 1).
• Instrumentation: CMOD (clip gauge) or mid-span deflection transducers with 0.01 mm accuracy; data acquisition rate ≥ 5 Hz initially. The standard provides an equivalence relation between CMOD and deflection for transforming results.
• Test procedure: controlled CMOD or deflection rate (e.g., CMOD increase 0.05 mm/min, accelerated to 0.2 mm/min after CMOD = 0.1 mm); record load–CMOD/deflection until CMOD ≥ 4 mm; reject tests where cracking starts outside the notch.
• Results: determination of FL (load at LOP), calculation of LOP stress and residual flexural tensile strengths fR,j at defined CMOD/deflection points. The standard specifies how to express and report these results and includes precision information.

Applications

• Quality control of metallic fibre concrete production and incoming materials.
• Performance-based specifications for fibre-reinforced concrete used in structural elements, pavements, tunnels, precast products and industrial floors where post-crack load-carrying capacity is required.
• Mix design optimization to compare fibre types, dosages and combinations (metallic + other fibres).
• Research and certification: material characterization, durability studies and compliance testing for product standards.

Who uses this standard

• Test laboratories and technical control units
• Precast concrete manufacturers and contractors
• Structural and pavement engineers specifying fibre-reinforced concrete performance
• Researchers and certification bodies assessing residual toughness and flexural behaviour

Related standards

• EN 12350-1 (sampling of fresh concrete)
• EN 12390-1, EN 12390-2 (hardened concrete specimens, curing)
• EN 12390-4 (testing machines - machine class requirements)

Keywords: EN 14651, metallic fibre concrete test, flexural tensile strength, LOP, residual strength, CMOD, fibre‑reinforced concrete, CEN.

Standards Content (Sample)

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.
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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

Expressions for limit of proportionality and for residual flexural tensile strength.16

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
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