Quality control for batching and mixing steel fibre-reinforced concretes

This document specifies the principles and procedures to secure quality control of steel fibre-reinforced concretes (SFRC) during batching and mixing procedures to deliver to a purchaser with the ingredients uniformly mixed, and that can be sampled and tested at the point of delivery.

Contrôle qualité pour le dosage et le mélange des bétons armés de fibres d'acier

General Information

Status
Published
Publication Date
07-Apr-2021
Current Stage
6060 - International Standard published
Start Date
08-Apr-2021
Completion Date
08-Apr-2021
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INTERNATIONAL ISO
STANDARD 22873
First edition
2021-04
Quality control for batching and
mixing steel fibre-reinforced
concretes
Contrôle qualité pour le dosage et le mélange des bétons armés de
fibres d'acier
Reference number
ISO 22873:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 22873:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 22873:2021(E)
Contents Page

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

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

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

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Materials ....................................................................................................................................................................................................................... 2

4.1 Steel fibres .................................................................................................................................................................................................. 2

4.1.1 Classification ....................................................................................................................................................................... 2

4.1.2 Shape .......................................................................................................................................................................................... 2

4.2 Admixture .................................................................................................................................................................................................... 2

4.3 Storage of fibres ..................................................................................................................................................................................... 2

5 Mixture proportioning ................................................................................................................................................................................... 3

5.1 General ........................................................................................................................................................................................................... 3

5.2 Proportioning methods ................................................................................................................................................................... 3

6 Batching ......................................................................................................................................................................................................................... 3

6.1 Measuring materials........................................................................................................................................................................... 3

6.2 Batching plant .......................................................................................................................................................................................... 3

7 Mixing............................................................................................................................................................................................................................... 3

7.1 General ........................................................................................................................................................................................................... 3

7.2 Mixer equipment ................................................................................................................................................................................... 4

7.3 Mixing method ........................................................................................................................................................................................ 4

7.3.1 Add fibres to transit mix truck ............................................................................................................................. 4

7.3.2 Add fibres to aggregate on a conveyor belt ............................................................................................... 4

8 Quality ............................................................................................................................................................................................................................. 5

8.1 Slump and air content ....................................................................................................................................................................... 5

8.2 Tolerances in slump ............................................................................................................................................................................ 5

8.3 Tolerances in air content ................................................................................................................................................................ 5

Bibliography ................................................................................................................................................................................................................................ 6

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 22873:2021(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.

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).

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. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

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 SC 6, Non-traditional reinforcing materials for concrete structures.

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 © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 22873:2021(E)
Quality control for batching and mixing steel fibre-
reinforced concretes
1 Scope

This document specifies the principles and procedures to secure quality control of steel fibre-reinforced

concretes (SFRC) during batching and mixing procedures to deliver to a purchaser with the ingredients

uniformly mixed, and that can be sampled and tested at the point of delivery.
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 13270, Steel fibres for concrete — Definitions and specifications
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 13270 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
slump

distance from the top of the slumped concrete to the level of the top of the slump cone.

3.2
workability
property measure of the ease of moulding or shaping an unshaped concrete.
3.3
segregation

separation of aggregate and fines during fabrication of a concrete to leave a honeycomb appearance

and/or a layer of excess fines.
3.4
fibre balling
bunch of fibres sticking together during fibre integration in the concrete mix.
3.5
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.
© ISO 2021 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 22873:2021(
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 22873
ISO/TC 71/SC 6
Quality control for batching and
Secretariat: JISC
mixing steel fibre-reinforced
Voting begins on:
2021­01­23 concretes
Voting terminates on:
2021­03­20
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 22873:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2021
---------------------- Page: 1 ----------------------
ISO/FDIS 22873:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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
CH­1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 22873:2021(E)
Contents Page

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

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

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

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Materials ....................................................................................................................................................................................................................... 2

4.1 Steel fibres .................................................................................................................................................................................................. 2

4.1.1 Classification ....................................................................................................................................................................... 2

4.1.2 Shape .......................................................................................................................................................................................... 2

4.2 Admixture .................................................................................................................................................................................................... 2

4.3 Storage of fibres ..................................................................................................................................................................................... 2

5 Mixture proportioning ................................................................................................................................................................................... 3

5.1 General ........................................................................................................................................................................................................... 3

5.2 Proportioning methods ................................................................................................................................................................... 3

6 Batching ......................................................................................................................................................................................................................... 3

6.1 Measuring materials........................................................................................................................................................................... 3

6.2 Batching plant .......................................................................................................................................................................................... 3

7 Mixing............................................................................................................................................................................................................................... 3

7.1 General ........................................................................................................................................................................................................... 3

7.2 Mixer equipment ................................................................................................................................................................................... 4

7.3 Mixing method ........................................................................................................................................................................................ 4

7.3.1 Add fibres to transit mix truck ............................................................................................................................. 4

7.3.2 Add fibres to aggregate on a conveyor belt ............................................................................................... 4

8 Quality ............................................................................................................................................................................................................................. 5

8.1 Slump and air content ....................................................................................................................................................................... 5

8.2 Tolerances in slump ............................................................................................................................................................................ 5

8.3 Tolerances in air content ................................................................................................................................................................ 5

Bibliography ................................................................................................................................................................................................................................ 6

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 22873:2021(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.

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).

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. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

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 SC 6, Non-traditional reinforcing materials for concrete structures.

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 © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 22873:2021(E)
Quality control for batching and mixing steel fibre-
reinforced concretes
1 Scope

This document specifies the principles and procedures to secure quality control of steel fibre-reinforced

concretes (SFRC) during batching and mixing procedures to deliver to a purchaser with the ingredients

uniformly mixed, and that can be sampled and tested at the point of delivery.
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 13270, Steel fibres for concrete — Definitions and specifications
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 13270 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
slump

distance from the top of the slumped concrete to the level of the top of the slump cone.

3.2
workability
property measure of the ease of moulding or shaping an unshaped concrete.
3.3
segregation

separation of aggregate and fines during fabrication of a concrete to leave a honeycomb appearance

and/or a layer of excess fines.
3.4
fibre balling
bunch of fibres sticking together during fibre integration in the concrete mix.
3.5
steel fibres

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

extracted fibr
...

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