ISO 1920-4:2020
(Main)Testing of concrete — Part 4: Strength of hardened concrete
Testing of concrete — Part 4: Strength of hardened concrete
This document specifies procedures for testing the strength of hardened concrete.
Essais du béton — Partie 4: Résistance du béton durci
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INTERNATIONAL ISO
STANDARD 1920-4
Second edition
2020-01
Testing of concrete —
Part 4:
Strength of hardened concrete
Essais du béton —
Partie 4: Résistance du béton durci
Reference number
©
ISO 2020
© ISO 2020
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Determination of compressive strength . 1
4.1 Test specimens . 1
4.2 Apparatus . 2
4.3 Age at test . 2
4.4 Number of specimens . 2
4.5 Procedure . 2
4.5.1 Preparation and positioning of specimens. 2
4.5.2 Loading . 3
4.5.3 Assessment of type of failure . 3
4.6 Test results. 6
4.7 Test report . 6
5 Determination of flexural strength . 6
5.1 Test specimens . 6
5.2 Age at test . 6
5.3 Number of specimens . 6
5.4 Apparatus . 7
5.5 Force application . 7
5.6 Procedures . 8
5.6.1 Preparation and positioning of specimens. 8
5.6.2 Loading . 9
5.6.3 Assessment of type of fracture . 9
5.7 Test results.10
5.8 Test report .11
6 Determination of tensile splitting strength .11
6.1 Specimens .11
6.2 Apparatus .11
6.3 Age at test .13
6.4 Number of specimens .13
6.5 Procedure .13
6.5.1 Condition of specimen at the time of testing: .13
6.5.2 Marking .13
6.5.3 Specimen positioning .14
6.5.4 Loading .14
6.5.5 Examination of specimen .14
6.6 Test results.15
6.7 Test report .15
7 Test report .15
Annex A (informative) Precision data for measurements of compressive strength .17
Annex B (normative) Adjustment of test specimens for the compressive strength test .18
Annex C (informative) Examples of test reports .27
Bibliography .30
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 1, Test methods for concrete.
This second edition cancels and replaces the first edition (ISO 1920-4:2005), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— the requirements for compressive testing machine have been included and defined;
— the testing age and number of specimens that need to be tested have been included and defined;
— the subclause on loading (see 5.6.2) has been updated.
A list of all parts in the ISO 1920 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 © ISO 2020 – All rights reserved
INTERNATIONAL STANDARD ISO 1920-4:2020(E)
Testing of concrete —
Part 4:
Strength of hardened concrete
1 Scope
This document specifies procedures for testing the strength of hardened concrete.
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 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between
10 IRHD and 100 IRHD
ISO 679, Cement — Test methods — Determination of strength
ISO 1920-3, Testing of concrete — Part 3: Making and curing test specimens
ISO 1920-6, Testing of concrete — Part 6: Sampling, preparing and testing of concrete cores
ISO 2781, Rubber, vulcanized or thermoplastic — Determination of density
ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
ISO 4662, Rubber, vulcanized or thermoplastic — Determination of rebound resilience
EN 316, Wood fiberboards — Definition, classification and symbols
3 Terms and definitions
No terms and definitions are listed in this document.
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/
4 Determination of compressive strength
4.1 Test specimens
The test specimen shall be:
— a cube or a cylinder in accordance with ISO 1920-3; or
— cores in accordance with ISO 1920-6.
Damaged specimens shall not be tested.
Specimens that are badly honeycombed and cracked shall not be regarded as being representative of
the quality of concrete supplied. In general, standard cube and cylinder specimens should not be tested
if they are badly honeycombed as this is an indication of poor specimen making. When such specimens
are tested, the tes
...
INTERNATIONAL ISO
STANDARD 1920-4
Second edition
2020-01
Testing of concrete —
Part 4:
Strength of hardened concrete
Essais du béton —
Partie 4: Résistance du béton durci
Reference number
©
ISO 2020
© ISO 2020
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Determination of compressive strength . 1
4.1 Test specimens . 1
4.2 Apparatus . 2
4.3 Age at test . 2
4.4 Number of specimens . 2
4.5 Procedure . 2
4.5.1 Preparation and positioning of specimens. 2
4.5.2 Loading . 3
4.5.3 Assessment of type of failure . 3
4.6 Test results. 6
4.7 Test report . 6
5 Determination of flexural strength . 6
5.1 Test specimens . 6
5.2 Age at test . 6
5.3 Number of specimens . 6
5.4 Apparatus . 7
5.5 Force application . 7
5.6 Procedures . 8
5.6.1 Preparation and positioning of specimens. 8
5.6.2 Loading . 9
5.6.3 Assessment of type of fracture . 9
5.7 Test results.10
5.8 Test report .11
6 Determination of tensile splitting strength .11
6.1 Specimens .11
6.2 Apparatus .11
6.3 Age at test .13
6.4 Number of specimens .13
6.5 Procedure .13
6.5.1 Condition of specimen at the time of testing: .13
6.5.2 Marking .13
6.5.3 Specimen positioning .14
6.5.4 Loading .14
6.5.5 Examination of specimen .14
6.6 Test results.15
6.7 Test report .15
7 Test report .15
Annex A (informative) Precision data for measurements of compressive strength .17
Annex B (normative) Adjustment of test specimens for the compressive strength test .18
Annex C (informative) Examples of test reports .27
Bibliography .30
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 1, Test methods for concrete.
This second edition cancels and replaces the first edition (ISO 1920-4:2005), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— the requirements for compressive testing machine have been included and defined;
— the testing age and number of specimens that need to be tested have been included and defined;
— the subclause on loading (see 5.6.2) has been updated.
A list of all parts in the ISO 1920 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 © ISO 2020 – All rights reserved
INTERNATIONAL STANDARD ISO 1920-4:2020(E)
Testing of concrete —
Part 4:
Strength of hardened concrete
1 Scope
This document specifies procedures for testing the strength of hardened concrete.
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 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between
10 IRHD and 100 IRHD
ISO 679, Cement — Test methods — Determination of strength
ISO 1920-3, Testing of concrete — Part 3: Making and curing test specimens
ISO 1920-6, Testing of concrete — Part 6: Sampling, preparing and testing of concrete cores
ISO 2781, Rubber, vulcanized or thermoplastic — Determination of density
ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
ISO 4662, Rubber, vulcanized or thermoplastic — Determination of rebound resilience
EN 316, Wood fiberboards — Definition, classification and symbols
3 Terms and definitions
No terms and definitions are listed in this document.
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/
4 Determination of compressive strength
4.1 Test specimens
The test specimen shall be:
— a cube or a cylinder in accordance with ISO 1920-3; or
— cores in accordance with ISO 1920-6.
Damaged specimens shall not be tested.
Specimens that are badly honeycombed and cracked shall not be regarded as being representative of
the quality of concrete supplied. In general, standard cube and cylinder specimens should not be tested
if they are badly honeycombed as this is an indication of poor specimen making. When such specimens
are tested, the tes
...
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