National foreword

This British Standard is the UK implementation of ISO 23945‑2:2026.

The UK participation in its preparation was entrusted to Technical Committee B/517/1, Concrete production and testing.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2026.

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.

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 documents 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 patent rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s) which may be required to implement this document. However, implementers are cautioned that this may not represent the latest information, which may be obtained from the patent database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

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 71, Concrete, reinforced concrete and pre- stressed concrete, Subcommittee SC1, Test methods for concrete.

A list of all parts in the ISO 23945 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

Sprayed concrete is widely used for the stabilization of structures in a very short time and for concrete applications without using moulds. In addition to being ideal for ground support in tunnelling and mining, sprayed concrete is also used in repairs, restoration, new constructions and many other fields.

The requirements for properties, test methods, standards and specifications for the spray forming process of concrete are different from those of cast forming concrete. This document is intended to provide a normative test method for sprayed concrete.

This document is applied under various climatic and geographical conditions, various levels of protection and under different established regional traditions and experiences. Consequently, this document includes conditions for tests covering standard, tropical and subtropical region environments.

This document is intended for use with other parts of the ISO 23945 series which provide requirements associated with the level of quality specified and the methods to be employed for the execution of sprayed concrete.

1 Scope

This document specifies a method for obtaining samples of fresh or hardened sprayed concrete or mortar in laboratory or in situ, depending on the property to be measured and its associated test method.

This document does not purport to address all of the safety concerns, if any, associated with its use.

2 Normative references

3 Terms and definitions

4 Principle

5 Apparatus

5.1 Mixer

5.2 Spraying equipment

5.3 Scoop

5.4 Trowel

5.5 Moulds

5.6 Coring or cutting equipment

6 Procedures

6.1 General

6.2 Obtaining a fresh sample from the basic mix before spraying

6.3 Obtaining a fresh sample from in situ sprayed concrete

6.4 Making a test panel

6.5 Obtaining a fresh sample from a test panel

6.6 Curing

6.7 Obtaining a hardened sample from in situ sprayed concrete

6.8 Obtaining a hardened sample from a test panel

6.9 Shape and size of hardened samples

7 Identification of sample

7.1 Fresh samples

7.2 Hardened samples

Bibliography