ISO 1920-10:2010

INTERNATIONAL ISO
STANDARD 1920-10
First edition
2010-09-15
Testing of concrete —
Part 10:
Determination of static modulus of
elasticity in compression
Essais du béton —
Partie 10: Détermination du module d'élasticité statique en compression

Reference number
©
ISO 2010
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ii © ISO 2010 – All rights reserved

Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 Principle.2
5 Apparatus.2
5.1 Testing machine .2
5.2 Strain measuring apparatus.2
6 Test specimens.2
6.1 General .2
6.2 Shape and dimensions of test specimens.2
6.3 Preparation of test specimens .3
7 Procedure.3
7.1 Determination of density .3
7.2 Determination of compressive strength .3
7.3 Determination of static modulus of elasticity.4
7.4 Calculation and expression of results .4
8 Test report.5
8.1 Information to be provided by the producer of the test specimens for inclusion in the test
report .5
8.2 Information to be provided by the test laboratory for inclusion in the test report.5
Annex A (informative) Automatic measuring method with monotonic loading for static modulus of
elasticity .7

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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 1920-10 was prepared by Technical Committee ISO/TC 71, Concrete, reinforced concrete and pre-
stressed concrete, Subcommittee SC 1, Test methods for concrete.
This first edition cancels and replaces ISO 6784:1982 which has been technically revised.
ISO 1920 consists of the following parts, under the general title Testing of concrete:
⎯ Part 1: Sampling of fresh concrete
⎯ Part 2: Properties of fresh concrete
⎯ Part 3: Making and curing test specimens
⎯ Part 4: Strength of hardened concrete
⎯ Part 5: Properties of hardened concrete other than strength
⎯ Part 6: Sampling, preparing and testing of concrete cores
⎯ Part 7: Non-destructive tests of hardened concrete
⎯ Part 8: Determination of drying shrinkage of concrete for samples prepared in the field or in the laboratory
⎯ Part 9: Determination of creep of concrete cylinders in compression
⎯ Part 10: Determination of static modulus of elasticity in compression

iv © ISO 2010 – All rights reserved

INTERNATIONAL STANDARD ISO 1920-10:2010(E)

Testing of concrete —
Part 10:
Determination of static modulus of elasticity in compression
1 Scope
This part of ISO 1920 specifies a test method for the determination of the static modulus of elasticity in
compression of hardened concrete, on test specimens which are cast or taken from a structure.
2 Normative references
The following referenced documents are indispensable for the application 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 1920-3, Testing of concrete — Part 3: Making and curing test specimens
ISO 1920-4, Testing of concrete — Part 4: Strength of hardened concrete
ISO 1920-5, Testing of concrete — Part 5: Properties of hardened concrete other than strength
ISO 1920-6, Testing of concrete — Part 6: Sampling, preparing and testing of concrete cores
EN 12390-4, Testing hardened concrete — Part 4: Compressive strength — Specification for testing machines
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
static modulus of elasticity in compression of hardened concrete
property of concrete, that corresponds to the tangent of the stress-strain curve
NOTE 1 For design purposes the modulus of elasticity is considered equivalent to the chord modulus of deformation,
when the test specimen is loaded between 0,5 MPa and F /3, as described in this part of ISO 1920.
c
NOTE 2 The modulus of elasticity can be considered as a modulus of deformation when the material is evaluated in
the elastic range.
3.2
gauge length
each part of the test specimen, over which the strain or change in length is determined
4 Principle
A basic stress of 0,5 N/mm (MPa) is applied to a test specimen and then the stress is gradually increased
until it is equal to one-third of the 2:1 cylinder strength of the concrete. The strains at the different loadings are
recorded.
The modulus of elasticity is calculated by dividing the difference between the basic stress and the upper
stress by the difference between the corresponding strains.
5 Apparatus
5.1 Testing machine
The test shall be carried out using a compression-testing machine conforming to EN 12390-4 or to a national
standard valid in the place of testing. The test machine shall be in calibration at the time of test. The
calibration shall be carried out at least once a year. The compression testing machine shall be capable of
applying the specified load at the specified rate and maintaining it at the required level.
5.2 Strain measuring apparatus
Instruments for measuring the changes in length (for example mirror or dial gauge extensometers, resistance
strain gauges, inductance gauges, vibrating wire-strain gauges) shall have a gauge length of not less than
two-thirds of the diameter of the test specimen (2/3 d) and shall not exceed its diameter size (d). It shall be
attached in such a way that the gauge points are equidistant from the two ends of the specimen and at a
distance not less than one-quarter of the length of the test specimen (L/4) from its ends.
Measurements shall normally be taken on not less than two opposite sides of the specimen. With specimens
cast in a horizontal position, the gauge lengths should be arranged on the vertical sides as cast.
−6
The measuring apparatus shall have an accuracy of ± 5 × 10 .
−6
Measu
...