EN 14488-7:2006

Testing sprayed concrete - Part 7: Fibre content of fibre reinforced concrete

This part of European Standard specifies a method for the determination of the fibre content of sprayed concrete from either a fresh or hardened (i.e. before or after set) concrete sample. Only the method using a fresh sample is appropriate with polymer fibres, while both types are applicable with steel fibres.

Prüfung von Spritzbeton - Teil 7: Fasergehalt von faserverstärktem Beton

Dieser Teil der Europäischen Norm legt ein Verfahren zur Bestimmung des Fasergehaltes von Spritzbeton in einer Probe fest, die entweder aus Frischmörtel/-beton oder Festmörtel/-betonFrisch- oder Festbeton (d. h. vor oder nach dem Erstarren) besteht. Bei Polymerfasern  ist nur die Prüfung am Frischbeton geeignet, während bei Stahlfasern beide Prüfmethoden möglich sind.

Essais pour béton projeté - Partie 7 : Teneur en fibres du béton renforcé par des fibres

La présente partie de cette Norme européenne spécifie une méthode de détermination de la teneur en fibres
du béton projeté sur un échantillon de béton frais ou durci (c’est-à-dire avant ou après prise). Les deux types
d’échantillons peuvent être utilisés avec des fibres d’acier, mais seule la méthode portant sur un échantillon
de béton frais convient pour des fibres polymères.

Preskušanje brizganega betona – 7. del: Vsebnost vlaken v vlaknatem armiranem betonu

General Information

• Status: Published
• Publication Date: 11-Apr-2006
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: CEN/TC 104 - Concrete ( performance, production, placing and compliance criteria )
• Drafting Committee: CEN/TC 104/WG 10 - Sprayed concrete
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 30-Jun-2023
• Completion Date: 14-Apr-2025
• Ref Project: SIST EN 14488-7:2006 - Testing sprayed concrete - Part 7: Fibre content of fibre reinforced concrete

Overview

EN 14488-7:2006 (CEN) specifies a test method to determine the fibre content of fibre-reinforced sprayed concrete using either fresh or hardened samples. The standard clarifies sampling options, extraction procedures and result expression to support reliable quality control and compliance assessment on sprayed concrete works. Note: Method B (fresh sample) is the only appropriate route for polymer fibres; both Method A (hardened) and Method B apply to steel fibres.

Key Topics

• Scope and purpose: Determine fibre content from a representative sprayed concrete coupon or core by extracting fibres and relating their mass to the specimen volume.

• Test methods:

  • Method A - Hardened sample: Cut three cores (diameter 50–100 mm; length 75–150 mm unless layer is thinner), determine specimen volume (by dimension calculation or water displacement), crush the core, extract and clean fibres, then weigh.
  • Method B - Fresh sample: Cut three coupons (1–2 kg each) from the full depth of the sprayed layer before final set, determine volume by weighing-in-water, wash out matrix material to recover fibres (alcohol soak may be used for synthetic fibres), dry and weigh.

• Apparatus and environment: Typical equipment includes an accurate balance, immersion tank for displacement at 20 ± 2 °C, non-absorbent cutting trowel and sieving/wash equipment for fibre separation.

• Mass and volume measurement: Mass of fibres is measured to 0.1 g for steel and 0.01 g for polymer fibres as appropriate. Sample volume is determined by weighing-in-water (reference) or dimensional calculation following EN 12350-6 and EN 12390-7.

• Result calculation: Fibre content (kg/m3) is obtained by converting extracted fibre mass into kilograms and dividing by specimen volume in m3. In practice: Cf (kg/m3) = (mf (g) ÷ 1000) ÷ Vd (m3).

• Reporting: Test reports should identify specimen and fibre type, specify method (A or B), list masses and calculated fibre contents for each specimen, give the mean and standard deviation, and note any deviations from the standard.

Applications

• Quality control and acceptance testing of sprayed concrete in tunnels, shotcrete repair, and civil engineering structures.
• Verification of supplied fibre dosage and homogeneity through depth to confirm design and performance assumptions for toughness, residual strength and crack control.
• Selection of sampling method depending on fibre type: use fresh-sample extraction for polymer fibres and either method for steel fibres.

Related Standards

• EN 14488-1 - Testing sprayed concrete: Sampling fresh and hardened concrete
• EN 12350-6 - Testing fresh concrete: Density (weighing-in-water method)
• EN 12390-7 - Testing hardened concrete: Density of hardened concrete
• EN 12504-1 - Testing concrete in structures: Cored specimens

This guidance focuses on practical test stages and reporting to help laboratories and site teams implement EN 14488-7:2006 for robust fibre-content determination and consistent quality control.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Testing sprayed concrete - Part 7: Fibre content of fibre reinforced concretePreskušanje brizganega betona – 7. del: Vsebnost vlaken v vlaknatem armiranem betonuEssais pour béton projeté - Partie 7 : Teneur en fibres du béton renforcé par des fibresPrüfung von Spritzbeton - Teil 7: Fasergehalt von faserverstärktem BetonTa slovenski standard je istoveten z:EN 14488-7:2006SIST EN 14488-7:2006en91.100.30Beton in betonski izdelkiConcrete and concrete productsICS:SLOVENSKI
STANDARDSIST EN 14488-7:200601-oktober-2006

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14488-7April 2006ICS 91.100.30 English VersionTesting sprayed concrete - Part 7: Fibre content of fibrereinforced concreteEssais pour béton projeté - Partie 7 : Teneur en fibres dubéton renforcé par des fibresPrüfung von Spritzbeton - Teil 7: Fasergehalt vonfaserverstärktem BetonThis European Standard was approved by CEN on 27 February 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate 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 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 of 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 FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14488-7:2006: E

This European Standard is part of a series concerned with testing sprayed concrete.
This series EN 14488 ‘Testing sprayed concrete’ 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 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 this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany,
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