ISO 18319-2:2022

Fibre reinforced polymer (FRP) reinforcement for concrete structures - Part 2: Specifications of CFRP strips

This document specifies requirements for unidirectional carbon fibre-reinforced polymer (CFRP) strips as external-bonded reinforcements on the concrete substrate. This document is applicable for the CFRP strips that: - consist of carbon fibre and thermoset resin; - are manufactured by pultrusion method; - have a carbon fibre fraction over 60 % by volume; and - have a thickness within 3 mm. This document specifies the methodologies to express the mechanical properties as characteristic values, appearance and dimensions, and sampling test.

Polymère renforcé par des fibres (PRF) pour l’armature du béton — Partie 2: Spécifications des bandes en PRFC

General Information

• Status: Published
• Publication Date: 16-Jan-2022
• ICS: 83.120 - Reinforced plastics
• ICS: 91.080.40 - Concrete structures
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: ISO/TC 71/SC 6 - Non-traditional reinforcing materials for concrete structures
• Drafting Committee: ISO/TC 71/SC 6 - Non-traditional reinforcing materials for concrete structures
• Current Stage: 6060 - International Standard published
• Start Date: 17-Jan-2022
• Due Date: 09-Sep-2022
• Completion Date: 17-Jan-2022

Relations

• Consolidated By: ISO 10855-2:2024 - Offshore containers and associated lifting sets - Part 2: Design, manufacture and marking of lifting sets
• Effective Date: 06-Jun-2022

Overview

ISO 18319-2:2022 defines specifications for unidirectional carbon fibre‑reinforced polymer (CFRP) strips used as external‑bonded reinforcement on concrete structures. The standard applies to CFRP strips that: consist of carbon fibre and thermoset resin, are manufactured by the pultrusion method, have a carbon‑fibre fraction > 60% by volume, and a thickness ≤ 3 mm. It provides requirements and methods for expressing mechanical properties as characteristic values, appearance and dimensional tolerances, straightness, and sampling tests.

Key topics and requirements

• Scope and materials: Unidirectional CFRP strips with thermoset resin, pultruded manufacture, >60% carbon fibre by volume, thickness within 3 mm.
• Appearance: Strips must be free from visible defects such as cracks, whitening (incomplete curing), and blistering.
• Dimensions & tolerances:
  • Nominal width, thickness, cross‑sectional area and length are agreed between parties.
  • Thickness tolerance: ±10% of nominal.
  • Width and cross‑sectional area shall be no less than nominal (see standard for complete table).
  • Length tolerances vary by nominal length (detailed bands for l ≥ 30 m, 30–10 m, 10–5 m, < 5 m).
• Straightness: Sampling straightness tolerance shall not exceed 0.5 mm; measurement procedure is specified (flattened strip on surface plate with 1 m metallic scale).
• Mechanical properties:
  • Characteristic values required for tensile strength, Young’s modulus, and ultimate strain (ultimate strain = tensile strength / Young’s modulus).
  • Characteristic tensile strength (initial inspection) = mean strength − 3 × standard deviation.
  • Characteristic Young’s modulus (initial inspection) = mean value.
• Sampling & testing:
  • Tensile test method referenced to ISO 10406‑3.
  • Initial inspection: ≥ 20 test pieces (from two or more production lots). Periodic inspection: ≥ 5 test pieces.
  • Dimensional measurement intervals and precisions specified (e.g., width/thickness every 10 m using caliper, 0.1 mm precision).

Applications and users

ISO 18319-2:2022 is essential for:

• Structural engineers and designers specifying FRP reinforcement for concrete strengthening, retrofitting and seismic upgrades.
• Manufacturers of CFRP strips (pultruded products) for quality control and compliance.
• Construction quality inspectors and testing laboratories performing sampling, dimensional checks and tensile testing.
• Procurement managers and contractors who need defined acceptance criteria for external‑bonded CFRP reinforcement.

Keywords: ISO 18319-2:2022, CFRP strips, pultrusion, carbon fibre, thermoset resin, external‑bonded reinforcement, tensile strength, Young’s modulus, sampling test, FRP reinforcement.

Related standards

• ISO 10406‑3 - Test methods for CFRP strips (referenced for tensile testing).
• ISO 14484 - Guidelines for design of concrete structures using FRP materials (for design use of characteristic values).

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 18319-2
First edition
2022-01
Fibre reinforced polymer (FRP)
reinforcement for concrete
structures —
Part 2:
Specifications of CFRP strips
Polymère renforcé par des fibres (PRF) pour l’armature du béton —
Partie 2: Spécifications des bandes en PRFC
Reference number
© ISO 2022
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 Appearance, dimensions, and straightness . 2
4.1 Appearance . 2
4.2 Dimensions . 2
4.2.1 Nominal width, thickness, cross sectional area and length . 2
4.2.2 Tolerance for width, thickness and cross-sectional area . 2
4.2.3 Tolerance for length . 2
4.3 Straightness . 3
5 Mechanical properties .3
5.1 General . 3
5.2 Characteristic value of tensile strength and Young’s modulus . 3
5.3 Characteristic value of ultimate strain . 3
6 Sampling test. 3
6.1 Dimensions . 3
6.1.1 Width, thickness and cross-sectional area . 3
6.1.2 Length . 3
6.1.3 Straightness . 4
6.2 Tensile properties . 4
6.2.1 Test method . 4
6.2.2 Tensile strength and Young’s modulus . 5
Bibliography . 6
iii
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This document was prepared by Technical Committee ISO/TC 71, Concrete, reinforced concrete and pre-
stressed concrete, Subcommittee SC 6, Non-traditional reinforcing materials for concrete structures.
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