ISO 19993:2020
(Main)Timber structures — Glued laminated timber — Face and edge joint cleavage test
Timber structures — Glued laminated timber — Face and edge joint cleavage test
This document specifies methods of evaluating the effectiveness of glued laminated timber face and edge bonds within a manufacturing plant by cleaving of the glue line in both dry and wet conditions. It is not intended that it be used for initial type testing where cyclic delamination or block shear is preferred. It is based on the principle that, provided minimum wood failure percentages are met, then the bond strength exceeds the perpendicular to the grain tension strength of the under-lying substrate and therefore the bond is not the weak element limiting the integrity of a glulam assembly.
Structures en bois — Bois lamellé-collé — Essai de fendage des joints face à face et longitudinaux
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 19993
Second edition
2020-04
Timber structures — Glued laminated
timber — Face and edge joint
cleavage test
Structures en bois — Bois lamellé-collé — Essai de fendage des joints
face à face et longitudinaux
Reference number
ISO 19993:2020(E)
©
ISO 2020
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ISO 19993:2020(E)
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ISO 19993:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
6 Preparation of test pieces . 2
7 Procedure. 3
7.1 General . 3
7.2 Conditioning for wet cleavage . 4
7.3 Cleaving and assessment . 4
8 Test report . 4
Annex A (informative) Advisory acceptance criteria after both ambient and wet conditioning .5
© ISO 2020 – All rights reserved iii
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ISO 19993:2020(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
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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).
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on the ISO list of patent declarations received (see www .iso .org/ patents).
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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 165, Timber structures.
This second edition cancels and replaces the first edition (ISO 19993:2007), which has been technically
revised.
The main changes compared to the previous edition are as follows.
— The acceptance criteria have been amended so that they are now contained in Annex A in keeping
with the fact that this document deals only with a testing method.
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
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ISO 19993:2020(E)
Introduction
This document was developed by TC 165 as a factory quality assurance test to be used for structural
glulam and applied to the face and edge joints of each production batch. Advisory acceptance criteria
are included in Annex A so that ISO 19993 is an independent document. The test is intended for use
in establishing the effectiveness of inter-laminar face and edge bond in structural glued laminated
timber of each production batch. It is not intended for use in initial type testing or to establish the
effectiveness inter-laminar bond brought about by major changes of a production process such as
change of adhesive, cramping pressures, adhesive curing or similar where cyclic delamination or block
shear is preferred. There is nothing in principle that would prevent the test method from being applied
to non-structural glulam
...
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