ISO 1920-6:2019
(Main)Testing of concrete — Part 6: Sampling, preparing and testing of concrete cores
Testing of concrete — Part 6: Sampling, preparing and testing of concrete cores
This document specifies a method for taking cores from hardened concrete, their examination, preparation for testing and determination of compressive strength. This document does not give guidance on the decision to drill cores or on the locations for drilling and does not provide procedures for interpreting the core strength results. It is recommended that before coring, full agreement should be reached by all parties on the need for core testing and how the results should be interpreted.
Essais du béton — Partie 6: Échantillonnage, préparation et essais sur des carottes de béton
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 1920-6
Second edition
2019-10
Testing of concrete —
Part 6:
Sampling, preparing and testing of
concrete cores
Essais du béton —
Partie 6: Échantillonnage, préparation et essais sur des carottes de
béton
Reference number
ISO 1920-6:2019(E)
©
ISO 2019
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ISO 1920-6:2019(E)
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© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2019 – All rights reserved
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ISO 1920-6:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 1
5 Taking of cores . 2
5.1 Age of concrete . 2
5.2 Location . 2
5.3 Drilling . 3
5.4 Number of cores. 3
5.5 Diameter of cores . 3
5.6 Length of cores . 3
5.7 Length-to-diameter (l/d) ratio . 4
5.8 Marking and identification . 4
5.9 Reinforcement . 4
6 Examination . 4
6.1 Visual inspection . 4
6.2 Measurements and calculations of drilled core specimens . 4
7 Preparation of cores . 4
7.1 General . 4
8 Compression test . 5
8.1 Storage . 5
8.2 Testing . 5
9 Test results . 5
10 Test report . 5
Annex A (informative) Example of a test report of core strength . 7
© ISO 2019 – All rights reserved iii
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ISO 1920-6:2019(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
prestressed concrete, Subcommittee SC 1, Test methods for concrete.
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.
This second edition cancels and replaces the first edition (ISO 1920-6:2004), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— requirements of compressive testing machine have been included and defined;
— Clause 5 has been redrafted;
— accuracy requirements at the time of measuring core diameter, core length have been redefined;
— tolerances of the prepared test specimen have been redefined;
— the curing of test specimens under tropical climate has been included and defined.
A list of all parts in the ISO 1920 series can be found on the ISO website.
iv © ISO 2019 – All rights reserved
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INTERNATIONAL STANDARD ISO 1920-6:2019(E)
Testing of concrete —
Part 6:
Sampling, preparing and testing of concrete cores
1 Scope
This document specifies a method for taking cores from hardened concrete, their examination,
preparation for testing and determination of compressive strength.
This document does not give guidance on the decision to drill cores or on the locations for drilling and
does not provide procedures for interpreting the core strength results.
It is recommended that before coring, full agreement should be reached by all parties on the need for
core testing and how the results should be interpreted.
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 1920-4, Testing of concrete — Part 4: Strength of hardened concrete
ISO 1920-5, Testing of concrete — Part 5: Density and water penetration depth
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
core strength
compressive strength of the cored specimen, as determined by the test defined in this document
4 Apparatus
4.1 Core drill, capable of extracting cores from the hardened concrete to the dimensions specified in
5.3 with the tolerances specified in Clause 7.
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ISO 1920-6:2019(E)
4.2 Compression testing machine
4.2.1 The test shall be carried out using a compression-testing machine which shall be robust, related
to the size of specimen and capable of providing rate of loading with minimum desired specifications the
place of testing.
4.2.1.1 Accuracy of the test machine shall be such that the percentage error for the loads within
proposed range of use of the machine and shall not exceed ±1,0 % of the indicated load.
4.2.1.2 The compression testing machine shall be provided with a control system. The control system
can be operated either by manual or automatic means. If the machine is not equipped with automatic
application of force, a pacer shall be fitted to enable the operator to maintain the specified rate. The
pacer shall indicate a rate within ±5,0 % of the specified rate.
4.2.1.3 Machine platens and auxiliary platens shall have a hardness value at least 550 HV (Vickers
Hardness).
4.2.1.4 The thic
...
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