ISO/FDIS 12236

ISO/TC 221
Secretariat: BSI
Date: 2025-122026-01-16
Geosynthetics — Static puncture test (CBR test)
Géosynthétiques — Essai de poinçonnement statique (essai CBR)
F/DISFDIS stage
Warning for WD’s and CD’s
This document is not an ISO International Standard. It is distributed for review and comment. It is subject to change
without notice and may not be referred to as an International Standard.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which
they are aware and to provide supporting documentation.
TThhiis drs draafftt i is s susubbmmiitttteed d ttoo aa ppaarraallellel l vvoottee i inn IISSOO,, CCEEN.N.

ISO/DISFDIS 12236:20252026(en)
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iii
Contents
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Apparatus . 3
5.1 Testing machine . 3
5.2 Plunger . 3
5.3 Clamping system . 4
6 Specimens . 6
7 Conditioning . 6
8 Procedure . 7
9 Recording, calculation and expression of results . 7
9.1 Recording of data . 7
9.2 Calculation and expression of results . 7
10 Test report . 7
Bibliography . 9

iv
ISO/DISFDIS 12236:20252026(en)
Foreword
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This document was prepared by Technical Committee ISO/TC 221 Geosynthetics, in collaboration with the
European Committee for Standardization (CEN) Technical Committee CEN/TC 189, Geosynthetics, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 12236:2006) which has been technically
revised.
The main changes are as follows:
— Figure 4 has been revised;
— Clause 10 has been updated;
— units have been made consistent.
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.
v
Geosynthetics — Static puncture test (CBR test)
1 Scope
This document specifies a method for the determination of the puncture resistance by measuring the force
required to push a flat-ended plunger through geosynthetics.
The test is normally carried out on dry specimens conditioned in the specified atmosphere.
The test is applicable to most types of geosynthetic products, but does not apply to products with apertures
greater than 10 mm.
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 554, Standard atmospheres for conditioning and/or testing — Specifications
ISO 7500-1, Metallic materials — Calibration and verification
...