Steel fibres for concrete — Definitions and specifications

ISO 13270:2013 specifies definitions and symbols, classification and codes, dimensions, masses and permissible variations, inspection methods, packing, delivery and storage for steel fibres for concrete. ISO 13270:2013 covers fibres intended for use in fibre-reinforced concrete, in all types of concrete and mortar, including sprayed concrete, flooring, precast, in situ and repair concretes. ISO 13270:2013 can also be referred to for fibres used in fibre-reinforced engineering material, such as stainless steel fibre use in reinforced refractory material.

Fibres d'acier pour béton — Définitions et spécifications

General Information

Status
Published
Publication Date
07-Jan-2013
Current Stage
9093 - International Standard confirmed
Start Date
06-Jun-2018
Completion Date
06-Jun-2018
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ISO 13270:2013 - Steel fibres for concrete -- Definitions and specifications
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INTERNATIONAL ISO
STANDARD 13270
First edition
2013-01-15
Steel fibres for concrete — Definitions
and specifications
Fibres d’acier pour béton — Définitions et spécifications
Reference number
ISO 13270:2013(E)
ISO 2013
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ISO 13270:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any

means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the

address below or ISO’s member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
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ISO 13270:2013(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols .......................................................................................................................................................................................................................... 3

5 Classification ............................................................................................................................................................................................................ 3

6 Ordering information ...................................................................................................................................................................................... 4

7 Requirements .......................................................................................................................................................................................................... 4

7.1 Dimensions and tolerances .......................................................................................................................................................... 4

7.2 Surface condition .................................................................................................................................................................................. 5

7.3 Tensile strength of fibres ................................................................................................................................................................ 6

7.4 Modulus of elasticity .......................................................................................................................................................................... 6

7.5 Bending requirements ...................................................................................................................................................................... 6

7.6 Mixing ............................................................................................................................................................................................................. 6

7.7 Reinforcing effect of the steel fibres in concrete ........................................................................................................ 6

7.8 Effect on consistency of concrete ............................................................................................................................................ 7

7.9 Effect on air of concrete................................................................................................................................................................... 7

8 Testing and Inspection ................................................................................................................................................................................... 7

8.1 General ........................................................................................................................................................................................................... 7

8.2 ITT (Initial Type Test) ....................................................................................................................................................................... 7

8.3 Factory production control (FPC) ........................................................................................................................................... 8

9 Packaging and package marking ......................................................................................................................................................11

Annex A (normative) Reference concretes ..................................................................................................................................................13

Bibliography .............................................................................................................................................................................................................................17

© ISO 2013 – All rights reserved iii
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ISO 13270:2013(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International

Standards adopted by the technical committees are circulated to the member bodies for voting.

Publication as an International Standard requires approval by at least 75 % of the member bodies

casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 13270 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 17, Steel wire rod

and wire products.
iv © ISO 2013 – All rights reserved
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INTERNATIONAL STANDARD ISO 13270:2013(E)
Steel fibres for concrete — Definitions and specifications
1 Scope

This International Standard specifies definitions and symbols, classification and codes, dimensions,

masses and permissible variations, inspection methods, packing, delivery and storage for steel fibres

for concrete.

This International Standard covers fibres intended for use in fibre-reinforced concrete, in all types of

concrete and mortar, including sprayed concrete, flooring, precast, in situ and repair concretes

This International Standard can also be referred to for fibres used in fibre-reinforced engineering

material, such as stainless steel fibre use in reinforced refractory material.
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.
ISO 404, Steel and steel products — General technical delivery requirements
ISO 1920-2:2005, Testing of concrete — Part 2: Properties of fresh concrete

ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic

method for the determination of repeatability and reproducibility of a standard measurement method

ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

ISO 7989-1, Steel wire and wire products — Non-ferrous metallic coatings on steel wire — Part 1:

General principles
ISO 10474, Metallic products — Inspection documents
ISO 22034-1, Steel wire and wire products — Part 1: General test methods

EN 197-1:2011, Cement — Part 1: Composition, specifications and conformity criteria for common cements

EN 206-1, Concrete — Part 1: Specification, performance,production and conformity

EN 933-2, Tests for geometrical properties of aggregates — Part 2: Determination of particle size distribution

— Test sieves, nominal size of apertures

EN 934-2:2009, Admixtures for concrete. mortar and grout — Part 2: Concrete admixtures — Definitions.

requirements, conformity, marking and labeling

EN 1008, Mixing water for concrete — Specification for sampling, testing and assessing the suitability of

water, including water recovered from processes in the concrete industry, as mixing water for concrete

EN 1766:2000, Products and systems for the protection and repair of concrete structures — Test methods —

Reference concretes for testing

EN 1992-1-1, Eurocode 2: Design of concrete structures — Part 1-1: General rules and rules for buildings

EN 12350-1, Testing fresh concrete — Part 1: Sampling
EN 12350-3, Testing fresh concrete — Part 3: Vebe test
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ISO 13270:2013(E)
EN 12350-4, Testing fresh concrete — Part 4: Degree of compactability

EN 14651, Test method for metallic fibre concrete — Measuring the flexural tensile strength (limit of

proportionality (LOP). residual)
EN 14845-2, Test methods for fibres in concrete — Part 2: Effect on concrete
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
steel fibres

straight or deformed pieces of cold-drawn steel wire, straight or deformed cut sheet fibres, melt-

extracted fibres, shaved cold-drawn wire fibres and fibres milled from steel blocks which are suitable

to be homogenously mixed into concrete or mortar

Note 1 to entry: Steel fibres are suitable reinforcement material for concrete because they possess a thermal

expansion coefficient equal to that of concrete, their Young’s Modulus is at least 5 times higher than that of

concrete and the creep of regular carbon steel fibres can only occur above 370 °C.

3.2
length
distance between the outer ends of the fibre
3.2.1
developed length

length of the deformed fibres after straightening the fibre without deforming the cross-section

3.3
equivalent diameter

diameter of a circle with an area equal to the mean cross-sectional area of the fibre

Note 1 to entry: For circular fibres, the equivalent diameter is equal to the diameter of the fibres.

3.4
aspect ratio
ratio of length (l) to equivalent diameter of the fibre
3.5
fibre shape

specific outer configuration of the fibres, both in the longitudinal direction and in the shape of the cross-

section and also the possible surface coatings and/or bundling of fibres
3.6
tensile strength of fibre
stress corresponding to the maximum force that one fibre can resist

Note 1 to entry: The methods concerning how to determine the tensile strength are explained in 7.3. The tensile

strength is calculated by dividing the maximum force a fibre can resist by the mean cross-sectional area of the fibre.

3.7
crack mouth opening displacement
CMOD

linear displacement measured by a transducer installed on a prism subjected to a centre-point load F

3.8
elastic modulus
initial slope of the tensile stress versus tensile strain curve
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ISO 13270:2013(E)
3.9
declared value

value for a product property, determined in accordance with this standard, that a manufacturer is confident

of achieving within the given tolerances taking into account the variability of the manufacturing process

3.10
linear displacement

displacement measured by a transducer installed on a prism subjected to a centre-point load F

3.11
residual flexural strength

notional 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 > CMODδ; or to δj where δj > δF ( j = 1,2,3,4)
Note 1 to entry: F is the load at LOP (see EN 14651).
4 Symbols
For the purposes of this document, the symbols and definitions in Table 1 apply.
Table 1 — Symbols and definitions
Symbols Definitions Unit
w width of the fibre mm
t thickness of the fibre mm
d diameter or equivalent diameter of the fibre mm
R tensile strength of the fibre MPa
l length of the fibre mm
λ aspect ratio of the fibre (λ = l/d)
l developed length of the fibre mm
m mass of the fibre g
ρ density of steel kg/m
Description for rectangular fibres.
5 Classification

The steel fibres shall conform to one of the groups and one of the shapes listed below:

a) Group

Steel fibres shall be classified into one of the following groups, in accordance with the basic material

used for the production of the fibres.
Group I: cold-drawn wire
Group II: cut sheet
Group III: melt extracted
Group IV: shaved cold-drawn wire
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ISO 13270:2013(E)
Group V: milled from blocks
b) Shape

Fibres shall be either straight or deformed. The manufacturer shall declare the shape of the fibre. The

control and tolerances on the shape shall be specified for each different shape separately.

When applicable, the type of bundling shall be declared.
c) Coating

When steel fibres are supplied with a coating (e.g. zinc coating), the type and characteristic quantity in

g/m shall be declared. The control of the quantity shall be a function of the type of coating and shall be

declared by the manufacturer. In the case of a zinc coating, the determination of the coating thickness

shall be performed according to ISO 7989-1. In the case of a Zn or Zn/Al coating, a protection against the

alkaline environment is recommended (passivation).
6 Ordering information

The purchaser shall clearly provide the following information concerning the product in his enquiry or order:

a) the desired quantity;
b) the number of this International Standard;

c) group, shape, coating if any, class A, class B for Group I and nominal tensile strength ;

d) diameter or equivalent diameter;
e) length;
f) the type of inspection document;

g) for stainless steel fibres, the steel grade shall be agreed at the time of ordering.

7 Requirements
7.1 Dimensions and tolerances
7.1.1 General

For fibres of group I and II, the length, equivalent diameter, the class (A or B), and the aspect ratio shall

be declared. The tolerances shall be as given in Table 2.

Specimens of fibres, when sampled in accordance with 8.2 and 8.3, and measured in accordance with

7.1.2 and 7.1.3, shall not deviate from the declared value by more than the tolerances given in Table 2. At

least 95 % of the individual specimens shall meet the specified tolerances.

For fibres of group III, IV and V, the range of lengths, equivalent diameters and aspect ratios shall be

declared. Specimens of fibres, when sampled in accordance with 8.2 and measured in accordance with

7.1.2 e 7.1.3 shall be within the specified range. At least 90 % of the individual specimen fibres shall meet

the specified tolerances in both cases.
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ISO 13270:2013(E)
Table 2 — Tolerances on fibre length and diameter
Deviation of the individual
Deviation of the average value
value relative to the declared
relative to the declared value
Property Range
value
Class A Class B Class A Class B
Length and devel- >30 mm ±3 mm ±5 %
±10 %
oped length l (or l ) ≤30 mm ±10 % ±1,5 mm
(Equivalent) diam- >0,30 mm ±5 %
±0,02 mm ±10 % ±0,015
eter d ≤0,30 mm ±0,015 mm
Length/diameter
±15 % ±7,5 %
ratio λ
7.1.2 Determination of length

The length shall be measured with a marking gauge (callipers) with an accuracy of 0,1 mm.

In the case of an irregular cross-section, the developed length of the fibre shall also be determined to

calculate the equivalent diameter. If straightening of the fibre is necessary, it shall be done by hand or,

if this is not possible, by hammering on a level of wood, plastic material or copper using a hammer of

similar material. During the straightening, the cross-section should not be changed.

7.1.3 Determination of (equivalent) diameter
7.1.3.1 Round wire fibres

The diameter of the fibre shall be measured with a micrometer, in two directions, approximately at right

angles, to an accuracy of 0,01 mm. The fibre diameter shall be the mean of the two diameters.

7.1.3.2 Rectangular fibres

The width (w) and thickness (t) of the fibres shall be measured with a micrometer with an accuracy of

0,01 mm.
The equivalent diameter (d) is calculated using the following formula:
4wt
7.1.3.3 Fibres with irregular cross-section

The mass (m) and the developed length (l ) of the fibre shall be determined. The mass shall be determined

to an accuracy of 0,001 g. The equivalent diameter is computed from the mass and the developed length

using the following formula:
41m× 0
πl ρ

Where ρ is the nominal density: for all steels except stainless steel, it may be taken as 7850 kg/m ; for

stainless steel, it may be taken as 7950 kg/m .”
7.2 Surface condition

The surface of fibre should be kept dry and clean, with no greasy dirt substances and inclusions existing

which may effect the consistence behaviour of steel-fibre concrete.
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ISO 13270:2013(E)

Seams and surface irregularities shall not be the cause for rejection, provided that tensile properties

are not less than the requirements of this specification and mixing performance in concrete is not

adversely affected.

Rust, mill scale, or other coatings shall not be the cause for rejection provided that the individual fibres

separate when mixed in concrete, and tensile and bending properties are not less than the requirements

of this specification.
7.3 Tensile strength of fibres

The tensile strength (R ) shall be determined in accordance with ISO 6892-1, except as indicated below,

and shall be declared.

For Group I (cold-drawn wire), the tensile strength shall be determined from the source wire before

deformation. The acceptable tolerance on the declared value of R shall be 15 % for individual values

and 7,5 % for the mean value. At least 95 % of the individual specimens shall meet the specified tolerance.

For Group II (cut sheet), the tensile strength shall be determined from the source plate before deformation.

The acceptable tolerance on the declared value of R shall be 15 % for individual values and 7,5 % for the

mean value. At least 95 % of the individual specimens shall meet the specified tolerance.

For Group III (melt-extracted fibres), Group IV (shaved cold-drawn wire) and Group V (milled from steel

blocks) the tensile strength shall be determined from fibres with a minimum length of 20 mm clamped

within the jaws of the testing machine. These fibre types have an irregular cross-section and therefore

the fibres will break at the minimum cross-section. The nominal tensile strength shall be determined by

dividing the maximum load during the tensile test by the cross-section calculated from the equivalent

diameter. The manufacturer may determine the cross-section at the break by an optical method, in

which case the tensile strength, obtained by dividing the maximum tensile load during the tensile test

by the fracture cross-section, may also be declared, giving the precision of the area measurement.

For Groups III, IV and V, the manufacturer may instead declare a minimum tensile strength and at least

90 % of the individual specimens of fibres shall then comply with this value.
7.4 Modulus of elasticity
The manufacturer shall declare the modulus of elasticity of the fibres.

The modulus of elasticity may be determined for Groups I and II fibres using the tensile test as described

in ISO 6892-1. The test shall be done on the basi
...

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