Test methods for fibre-reinforced cementitious composites — Load-displacement curve using notched specimen

ISO 19044:2016 specifies the test method for the load-displacement curves of fibre-reinforced cementitious composites (FRCC) by three-point loading of notched prisms. The main purpose of this test is to evaluate the tension softening curve of FRCC.

Méthodes d'essai des composites à base de ciment renforcés par des fibres — Courbe de déplacement de charge utilisant un échantillon entaillé

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Status
Published
Publication Date
30-Oct-2016
Current Stage
9020 - International Standard under periodical review
Start Date
15-Oct-2021
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ISO 19044:2016 - Test methods for fibre-reinforced cementitious composites -- Load-displacement curve using notched specimen
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INTERNATIONAL ISO
STANDARD 19044
First edition
2016-11-01
Test methods for fibre-reinforced
cementitious composites — Load-
displacement curve using notched
specimen
Méthodes d’essai des composites à base de ciment renforcés par des
fibres — Courbe de déplacement de charge utilisant un échantillon
entaillé
Reference number
ISO 19044:2016(E)
ISO 2016
---------------------- Page: 1 ----------------------
ISO 19044:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

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ii © ISO 2016 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 19044:2016(E)
Contents Page

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

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

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

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

4 Symbols .......................................................................................................................................................................................................................... 2

5 Test specimen .......................................................................................................................................................................................................... 2

5.1 Geometry ...................................................................................................................................................................................................... 2

5.2 Fabrication of specimen .................................................................................................................................................................. 2

5.3 Loading of specimen .......................................................................................................................................................................... 3

6 Test equipment....................................................................................................................................................................................................... 3

6.1 Testing machine ..................................................................................................................................................................................... 3

6.2 Loading apparatus ............................................................................................................................................................................... 3

6.3 Measuring device for load ............................................................................................................................................................. 4

6.4 Measuring device for CMOD ........................................................................................................................................................ 4

6.5 Measuring device for LPD .............................................................................................................................................................. 5

7 Test procedure ........................................................................................................................................................................................................ 5

8 Calculations................................................................................................................................................................................................................ 6

9 Test report ................................................................................................................................................................................................................... 6

Annex A (informative) Method of estimating tension softening curve ............................................................................. 7

Bibliography .............................................................................................................................................................................................................................10

© ISO 2016 – All rights reserved iii
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ISO 19044:2016(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 on 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 the following URL: www.iso.org/iso/foreword.html.

The committee responsible for this document is ISO/TC 71, Concrete, reinforced concrete and pre-

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

iv © ISO 2016 – All rights reserved
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INTERNATIONAL STANDARD ISO 19044:2016(E)
Test methods for fibre-reinforced cementitious
composites — Load-displacement curve using notched
specimen
1 Scope

This document specifies the test method for the load-displacement curves of fibre-reinforced

cementitious composites (FRCC) by three-point loading of notched prisms. The main purpose of this

test is to evaluate the tension softening curve of FRCC.

NOTE 1 Both crack mouth opening displacement (CMOD) and load point displacement (LPD) are specified as

the displacement in load-displacement curves, but measurement of both might not be necessary. Either can be

selected depending on the purpose of measurement.

NOTE 2 Three-point bending test using notched specimen generally provides higher results than those

observed in four-point bending test, in which the fracture occurs at the weakest point of the specimen.

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 1920-3:2004, Testing of concrete — Part 3: Making and curing test specimens
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:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
fibre-reinforced cementitious composite
FRCC

concrete or mortar containing short discrete fibres that are distributed in matrix

Note 1 to entry: Fibres include chemical fibres (metallic fibres, inorganic fibres, synthetic fibres, and so on) and

natural fibres.
3.2
ligament
area above the notch subject to fracture
3.3
notch
cut for the initiation of fracture
© ISO 2016 – All rights reserved 1
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ISO 19044:2016(E)
4 Symbols
Symbol Unit Description Reference
a mm depth of notch 5.1
b mm width of ligament 5.1
D mm depth of cross section of specimen 5.1
h mm height of ligament 5.1
L mm overall length of specimen 5.1
n mm width of notch 5.1
S mm loading span 5.1
5 Test specimen
5.1 Geometry

Specimens shall be prisms of square cross section with a notch at the mid-length as shown in Figure 1.

a) The cross sectional size of the specimen shall be fixed with two types for the ease of operating

as follows: 150 mm × 150 mm and 100 mm × 100 mm. The side length of the cross section of the

specimen shall be equal to or larger than three times the fibre length.

The specimens with different dimensions provide different test results even if the same FRCC is

used. These test results should not be compared.
b) The overall length of the specimen (L) shall not be less than 3,5 D.

c) The notch depth (a ) and notch width (n ) shall be 0,3 D and not more than 5 mm, respectively.

0 0
Key
1 direction of casting
Figure 1 — Specimen
5.2 Fabrication of specimen

a) The maximum aggregate size shall not be larger than 1/4 of the side length of the cross section of

the specimen.
b) Moulds specified in ISO 1920-3:2004, 5.2.1 shall be used.
2 © ISO 2016 – All rights reserved
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ISO 19044:2016(E)

c) FRCC shall be placed in one placing sequence without joints. In case of flowable FRCC, pouring

toward the axial direction from the one side of the mould is recommended. The internal vibrator

and compacting rod/bar shall not be used.

d) The notch shall be cut using a concrete saw when the FRCC has developed sufficient strength.

The notch should be cut in one side that faced the s
...

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