Foreword

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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.

This third edition cancels and replaces the second edition (ISO 10406-1:2015), which has been technically revised.

The main changes are as follows:

inclusion of thermoplastic resin for FRP bars;
addition of the test method for fibre volume fraction of FRP bars;
revision of test methods for alkaline resistance, long-term relaxation, tensile fatigue strength, and creep failure strength to enhance rigor and comprehensiveness;
increase in the minimum number of test specimens from 3 to 5 for all test methods to ensure data reliability.

A list of all parts in the ISO 10406 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.

Introduction

Fibre reinforced polymer (FRP) bars, renowned for their high strength, lightweight nature, excellent bond behaviour, and superior durability, serve a pivotal role in reinforcing new constructions and rehabilitating existing reinforced concrete structures. As the global use of FRP bars continues to expand, the need for standardized test methods has become paramount. Unlike steel, FRP bars exhibit anisotropic behaviour and their performance is influenced by the type of fibres, resin matrix, and manufacturing processes. As such, rigorous and consistent test methods are essential to accurately evaluate the physical properties, mechanical properties, long-term durability, and reliability of FRP bars in various environmental and loading conditions.

This document provides a comprehensive framework for evaluating the physical properties, mechanical properties, durability, and long-term performance of FRP bars. It aims to promote uniformity in test methods globally, thereby ensuring consistency in product quality and facilitating international trade. By establishing these test methods, this document supports engineers, manufacturers, and regulators in the design, production, and certification of FRP reinforcement systems for safe and sustainable infrastructure.

1 Scope

This document specifies test methods applicable to fibre-reinforced polymer (FRP) bars as reinforcement or pre-stressing tendons in concrete, including physical, mechanical, durability, and long-term properties.

FRP bars in this document are made of fibre and resin matrix. Types of fibres are aramid fibre, basalt fibre, carbon fibre or glass fibre. The matrix includes thermosetting resins, such as vinylester, unsaturated polyester resins, as well as thermoplastic resins, including polypropylene, polyamides, and polymethyl methacrylate.

2 Normative references

3 Terms, definition, and symbols

3.1 Terms and definitions

3.2 Symbols

4 General provision concerning test pieces

5 Test method for physical properties

5.1 Cross-sectional area

5.2 Fibre volume fraction

5.3 Coefficient of thermal expansion

6 Test method for short-term mechanical properties

6.1 Tensile properties

6.2 Bond strength

6.3 Anchorages and couplers

6.4 Transverse shear strength

6.5 Flexural tensile properties

7 Test method for durability

7.1 Alkali resistance

8 Test method for long-term mechanical properties

8.1 Long-term relaxation

8.2 Tensile fatigue strength

8.3 Creep rupture strength