Steels for the reinforcement of concrete — Reinforcement couplers for mechanical splices of bars — Part 2: Test methods

This document specifies test methods applicable to couplers for mechanical splices of steel reinforcing bars. This document is applicable to the various standards for steel reinforcing bars as well as the various reinforced concrete design standards.

Aciers pour l'armature du béton — Coupleurs d'armature destinés aux raboutages mécaniques de barres — Partie 2: Méthodes d'essai

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Status
Published
Publication Date
11-Oct-2018
Current Stage
6060 - International Standard published
Start Date
12-Oct-2018
Completion Date
12-Oct-2018
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ISO 15835-2:2018 - Steels for the reinforcement of concrete -- Reinforcement couplers for mechanical splices of bars
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INTERNATIONAL ISO
STANDARD 15835-2
Second edition
2018-10
Steels for the reinforcement of
concrete — Reinforcement couplers
for mechanical splices of bars —
Part 2:
Test methods
Aciers pour l'armature du béton — Coupleurs d'armature destinés
aux raboutages mécaniques de barres —
Partie 2: Méthodes d'essai
Reference number
ISO 15835-2:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO 15835-2:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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
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Phone: +41 22 749 01 11
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Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 15835-2:2018(E)
Contents Page

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

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

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

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

4 Symbols .......................................................................................................................................................................................................................... 1

5 Testing of mechanical splices .................................................................................................................................................................. 2

5.1 General ........................................................................................................................................................................................................... 2

5.2 Preparation of test pieces .............................................................................................................................................................. 2

5.3 Tensile test .................................................................................................................................................................................................. 3

5.3.1 General...................................................................................................................................................................................... 3

5.3.2 Testing equipment .......................................................................................................................................................... 3

5.3.3 Test procedure ................................................................................................................................................................... 3

5.3.4 Failure mode and location ....................................................................................................................................... 4

5.4 Slip test .......................................................................................................................................................................................................... 4

5.4.1 General...................................................................................................................................................................................... 4

5.4.2 Testing equipment .......................................................................................................................................................... 4

5.4.3 Test procedure ................................................................................................................................................................... 4

5.4.4 Evaluation of slip under Option 1 as defined in ISO 15835-1 ................................................... 5

5.4.5 Evaluation of slip under Option 2 as defined in ISO 15835-1 ................................................... 5

5.5 High-cycle fatigue test ....................................................................................................................................................................... 6

5.5.1 Principle of the test ........................................................................................................................................................ 6

5.5.2 S-N diagram .......................................................................................................................................................................... 6

5.6 Low-cycle loading test ...................................................................................................................................................................... 7

5.7 Identification and marking ........................................................................................................................................................... 8

6 Test report ................................................................................................................................................................................................................... 8

© ISO 2018 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 15835-2:2018(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.

The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 16, Steels for the

reinforcement and prestressing of concrete.

This second edition cancels and replaces the first edition (ISO 15835-2:2009), which has been

technically revised with changes made to Clauses 5 and 6, 5.2, 5.4 and 5.6 and Table 1. The figures have

been revised and renumbered.
A list of all the parts in the ISO 15835 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 2018 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 15835-2:2018(E)
Steels for the reinforcement of concrete — Reinforcement
couplers for mechanical splices of bars —
Part 2:
Test methods
1 Scope

This document specifies test methods applicable to couplers for mechanical splices of steel

reinforcing bars.

This document is applicable to the various standards for steel reinforcing bars as well as the various

reinforced concrete design standards.
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 6892-1:2016, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

ISO 9513, Metallic materials — Calibration of extensometer systems used in uniaxial testing

ISO 15630-1, Steel for the reinforcement and prestressing of concrete — Test methods — Part 1: Reinforcing

bars, wire rod and wire

ISO 15835-1, Steels for the reinforcement of concrete — Reinforcement couplers for mechanical splices of

bars — Part 1: Requirements
ISO 16020, Steel for the reinforcement and prestressing of concrete — Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 15835-1 and ISO 16020 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/
4 Symbols
Table 1 — Symbols
Symbol Unit Designation
A % Percentage total elongation at maximum tensile force, F
gt max
d mm Nominal diameter of the reinforcing bar
E MPa Nominal modulus of elasticity of the reinforcing bar
a 2
1 MPa = 1 N/mm .
© ISO 2018 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 15835-2:2018(E)
Table 1 (continued)
Symbol Unit Designation
L mm Length of mechanical splice as defined in ISO 15835-1
L mm Coupler length
L mm Gauge length for the measurement of slip
L mm Gauge length for conducting the low-cycle loading test
N — Specified number of load cycles in high-cycle fatigue test
Specified characteristic (or nominal) yield strength value of the
R MPa
eH, spec
reinforcing bar
ΔL mm Calculated elastic elongation of an unspliced bar
Total elongation of the spliced bar measured as elongation of the
ΔL mm
gauge length
ΔL mm Slip of the mechanical splice
ΔL mm Gauge length extension under load
ε % Strain at nominal yield strength
2σ MPa Stress range for high-cycle fatigue test
σ MPa Upper stress in the axial load fatigue test
max
σ MPa Lower stress in the axial load fatigue test
min
a 2
1 MPa = 1 N/mm .
5 Testing of mechanical splices
5.1 General
The test methods covered by this document are as follows:
a) tensile test (see 5.3);
b) slip test (see 5.4);
c) high-cycle fatigue test (see 5.5);
d) low-cycle loading test (see 5.6).

A reference bar shall always be tested in the case of qualification testing and continuous independent

testing, for each test except the fatigue test. The reference bar shall be taken from the same length of

reinforcing bar as used in the test splice. Where different diameters are used in a splice, the reference

bar shall be taken from the smaller bar diameter of the splice.

For the calculation of stresses, the nominal cross-sectional area of the reinforcing bar shall be used.

For couplers with adjustable length, splices should be tested at their maximum extension in accordance

with the manufacturer’s instructions.
The temperature in the testing laboratory should be between 10 °C and 30 °C.
5.2 Preparation of test pieces

All tests shall be performed on mechanical splices prepared and assembled in the same manner as they

are prepared for normal use, according to written installation instructions from the supplier of the

coupler. The installation instruction documents for the coupler shall be made avail

...

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