ISO 6935-3:2023

Steel for the reinforcement of concrete - Part 3: Welded fabric

This document specifies technical requirements for factory made sheets or rolls of welded fabric, manufactured from steel wires or bars with diameters from 4 mm to 18 mm and designed for the reinforcement of concrete structures and the ordinary reinforcement of prestressed concrete structures.

Aciers à béton pour armatures passives — Partie 3: Treillis soudés

General Information

• Status: Published
• Publication Date: 28-Nov-2023
• ICS: 77.140.15 - Steels for reinforcement of concrete
• ICS: 91.080.40 - Concrete structures
• Technical Committee: ISO/TC 17/SC 16 - Steels for the reinforcement and prestressing of concrete
• Drafting Committee: ISO/TC 17/SC 16 - Steels for the reinforcement and prestressing of concrete
• Current Stage: 6060 - International Standard published
• Start Date: 29-Nov-2023
• Due Date: 20-May-2024
• Completion Date: 29-Nov-2023

Relations

• Revises: ISO 6935-3:1992 - Steel for the reinforcement of concrete - Part 3: Welded fabric
• Effective Date: 06-Jun-2022

Overview

ISO 6935-3:2023 - "Steel for the reinforcement of concrete - Part 3: Welded fabric" defines technical requirements for factory-made sheets or rolls of welded fabric (welded wire fabric/welded mesh) used as reinforcement in concrete structures. It covers welded fabric manufactured from steel wires or bars with nominal diameters from 4 mm to 18 mm, intended for ordinary reinforcement of reinforced and prestressed concrete.

Keywords: ISO 6935-3, welded fabric, welded mesh, steel reinforcement, reinforcement of concrete, welded wire fabric.

Key topics and technical requirements

• Scope and product types
  • Applies to machine-made welded fabric produced by electrical resistance welding from cold-reduced wire, plain bars or ribbed bars (4–18 mm range; plain/ribbed bars typically 6–18 mm).
• Geometry and tolerances
  • Defines fabric geometry (length, width, longitudinal/transverse wires, overhang) and two families: regular fabric (uniform diameters and spacing) and designed fabric (custom, by agreement).
  • Minimum overhang: 25 mm. Spacing guidance: longitudinal spacing preferably multiples of 50 mm, transverse multiples of 25 mm; minimum spacing 100 mm.
  • Permitted deviations: length/width ±25 mm or ±0.5% (whichever greater); spacing ±10 mm or ±5%; diagonal difference ±0.5%.
• Weld quality and permitted defects
  • Welds must be shear-resistant; broken welds limited to ≤ 1% of total or ≤ half along any one wire.
• Mechanical and chemical properties
  • Chemical and mechanical requirements reference ISO 10544 (cold-reduced wire), ISO 6935‑1 (plain bars) and ISO 6935‑2 (ribbed bars).
  • Shear strength of welded joints: at least 30% of specified characteristic yield/proof stress × nominal cross-sectional area of the thickest wire (reducible to 25% by agreement).
• Testing and inspection
  • Mechanical tests (tensile, bend, joint shear) performed per ISO 15630‑2. Test pieces taken from delivered fabric, with specific gauge lengths and sampling rules.
• Designation, marking and conformity
  • Clauses cover product designation, marking requirements and production/acceptance inspection procedures.

Applications and users

• Practical uses: floor slabs, walls, precast elements, shotcrete or other reinforced concrete applications where welded mesh is specified for distribution and crack control.
• Primary users:
  • Structural and civil engineers specifying reinforcement
  • Fabric manufacturers and quality control teams
  • Contractors and precast producers purchasing welded fabric
  • Inspection bodies and procurement professionals verifying conformity

Related standards

• ISO 6935-1 (plain bars), ISO 6935-2 (ribbed bars)
• ISO 10544 (cold-reduced wire for welded fabric)
• ISO 15630-2 (test methods for welded fabric and lattice girders)

ISO 6935-3:2023 provides a concise, standardized basis for producing, testing and specifying welded fabric for reliable steel reinforcement in concrete construction.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 6935-3
Second edition
2023-11
Steel for the reinforcement of
concrete —
Part 3:
Welded fabric
Aciers à béton pour armatures passives —
Partie 3: Treillis soudés
Reference number
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Form and dimensions . 3
4.1 General requirements . 3
4.2 Geometry of regular fabric . 4
4.3 Geometry of designed fabric . 5
5 Chemical composition .5
6 Mechanical properties .5
7 Testing of mechanical properties .5
7.1 General . 5
7.2 Tensile test . 5
7.3 Bend test . 6
7.4 Strength of welded joints . 6
8 Designation . 7
8.1 Regular fabric . 7
8.2 Designed fabric . 8
9 Marking . . 8
10 Testing and inspection . 8
10.1 General . 8
10.2 Evaluation of conformity during production . 8
10.3 Acceptance testing of a specific delivery . 9
10.3.1 General . 9
10.3.2 Evaluation of characteristic values . . 9
10.3.3 Verification of guaranteed minimum values . 11
10.3.4 Test report . 11
Bibliography .12
iii
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
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
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For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 16, Steels for
the reinforcement and prestressing of concrete.
This second edition cancels and replaces the first edition (ISO 6935-3:1992), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 6935-3:1992/Cor 1:2000.
The main changes are as follows:
— Clauses 1, 2, 3 and 4 have been revised;
— Figure 1 has been replaced with a new figure.
A list of all parts in the ISO 6935 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
INTERNATIONAL STANDARD ISO 6935-3:2023(E)
Steel for the reinforcement of concrete —
Part 3:
Welded fabric
1 Scope
This document specifies technical requirements for factory made sheets or rolls of welded fabric,
manufactured from steel wires or bars with diameters from 4 mm to 18 mm and designed for
the reinforcement of concrete structures and the ordinary reinforcement of prestressed concrete
structures.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 6935-1, Steel for the reinforcement of concrete — Part 1: Plain bars
ISO 6935-2, Steel for the reinforcement of concrete — Part 2: Ribbed bars
ISO 10544, Cold-reduced steel wire for the reinforcement of concrete and the manufacture of welded fabric
ISO 15630-2, Steel for the reinforcement and prestressing of concrete — Test methods — Part 2: Welded
fabric and lattice girders
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
characteristic value
value having a prescribed probability of not being attained in a hypothetical unlimited test series
Note 1 to entry: Equivalent to “fractile”, which is defined in ISO 3534-1:2006.
Note 2 to entry: A nominal value is used as the characteristic value in some circumstances.
[SOURCE: ISO 16020:2005, 2.4.10, modified —Note 2 to entry has been added.]
3.2
fabric
geometrical arrangement of longitudinal and transverse wires that are arranged substantially at right
angles to each other and welded together at all points of intersection
Note 1 to entry: See Figure 1.
Key
b spacing of the longitudinal wire
b spacing of the transverse wire
u overhang of the longitudinal wire
u overhang of the longitudinal wire
u overhang of the transverse wire
u overhang of the transverse wire
B width of fabric (length of the transverse wire)
L length of fabric (length of the longitudinal wire)
Figure 1 — Geometric characteristics of fabric
3.3
inspection
activities such as measuring, examining, testing, gauging one or more characteristics of a product or
service and comparing these with specified requirements to determine conformity
3.4
length of fabric
longest side of the fabric, irrespective of the manufacturing direction
3.5
longitudinal wire
wire in the manufacturing direction of the fabric
3.6
nominal cross-sectional area
cross-sectional area equivalent to the area of a circular plain bar of the same nominal diameter
[SOURCE: ISO 16020:2005, 2.2.15, modified — “wire” has been removed from the definition.]
3.7
overhang
length of longitudinal or transverse wires beyond the centre of the outer crossing wire in a fabric
Note 1 to entry: For twin wire fabric, the overhang is measured from the tangent line of the adjacent wires, see
Figure 2.
3.8
spacing
centre-to-centre distance of wires in a fabric
Note 1 to entry: For twin wire fabric, the spacing is measured between the tangents of the adjacent wires, see
Figure 2.
Figure 2 — Wire spacing, b, and overhang, u
3.9
transverse wire
wire perpendicular to the manufacturing direction of the fabric
3.10
twin wires
two wires of the same type and size placed adjacently and in contact with each other as a pair
3.11
width of fabric
shortest side of the fabric, irrespective of the manufacturing direction
3.12
wire
material from which the fabric is welded
Note 1 to entry: For the purposes of this document, the term “wire” also includes bars within the size range
specified in 4.1.1.
4 Form and dimensions
4.1 General requirements
4.1.1 The fabric shall be made of either
— cold-reduced wires with nominal diameters in the range from 4 mm to 18 mm and with mass and
geometry in accordance with ISO 10544,
— plain bars with nominal diameters of 6 mm to 18 mm (recommended: 6 mm, 8 mm, 10 mm and
12 mm, 18 mm plain bars may be used by agreement between the manufacturer and purchaser) and
with mass in accordance with ISO 6935-1, or
— ribbed bars with nominal diameters of 6 mm to 18 mm (recommended: 6 mm, 8 mm, 10 mm and
12 mm, 18 mm ribbed bars may be used by agreement between the manufacturer and purchaser)
and with mass and geometry in accordance with ISO 6935-2.
4.1.2 All fabric shall be machine made, and the joints at the in
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