ISO 12958-2-2020 PDF

Full title and description

Geotextiles and geotextile-related products — Determination of water flow capacity in their plane — Part 2: Performance test. This International Standard specifies a performance test method to determine the constant‑head in‑plane water flow capacity of geotextiles and geotextile‑related products using representative boundary materials and test conditions of interest (soil confinement, low hydraulic gradients, seating times and an array of normal loads).

Abstract

ISO 12958-2:2020 defines a laboratory performance procedure for measuring the constant‑head water flow capacity within the plane of geotextiles or related products under realistic boundary conditions. The document establishes test apparatus and materials, specimen preparation and boundary conditions, the test procedure, calculation and expression of results, and reporting requirements. Informative annexes provide temperature correction, worked examples and guidance on using reference soils.

General information

• Status: Published
• Publication date: October 2020 (ISO edition 1, published 2020-10)
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 59.080.70 (Geotextiles)
• Edition / version: Edition 1 (2020)
• Number of pages: 16

Bibliographic and status details as provided in the ISO catalog entry for ISO 12958-2:2020.

Scope

This part of ISO 12958 specifies a performance test for determining the in‑plane, constant‑head water flow capacity of geotextiles and geotextile‑related products under representative boundary conditions. The scope covers selection of boundary materials (including soil), confinement arrangements, low hydraulic gradients, seating times and a range of normal loads to simulate field conditions. It is intended to complement the index test method given in ISO 12958-1 (index test) and to replace/extend the prior 2010 edition of ISO 12958.

Key topics and requirements

• Definition of principle and purpose of the constant‑head in‑plane flow performance test.
• Detailed apparatus and materials requirements (test cell, boundary materials, instrumentation).
• Specimen preparation, conditioning and selection of boundary conditions including use of representative soils or reference soils.
• Test procedure: seating, application of normal load, establishment of low hydraulic gradients and steady‑state flow measurement.
• Calculations and expression of results (conversion to standard temperature where required).
• Test report content and required data to demonstrate reproducibility and traceability; informative annexes with worked examples and correction factors.

Typical use and users

This standard is used by geotechnical and civil engineers, geosynthetics manufacturers, independent testing laboratories, product specification writers and researchers who need performance‑based measurements of in‑plane water flow capacity for design, quality control, acceptance testing and R&D of geotextiles and related products.

Related standards

ISO 12958-1:2020 (Index test for in‑plane flow) — complements Part 2 by providing a factory index test. The earlier consolidated ISO 12958:2010 has been withdrawn and superseded by ISO 12958-1:2020 and ISO 12958-2:2020. Regional/adopted versions include EN/ISO adoptions (EN ISO 12958-2:2020, national implementations).

Keywords

geotextile, geotextile-related product, in‑plane water flow, constant‑head, performance test, hydraulic gradient, soil confinement, reference soil, test method, ISO 12958-2:2020

FAQ

Q: What is this standard?

A: ISO 12958-2:2020 is an International Standard specifying a laboratory performance test method to determine the constant‑head in‑plane water flow capacity of geotextiles and geotextile‑related products.

Q: What does it cover?

A: It covers apparatus and materials, specimen and boundary condition selection (including soils), the stepwise test procedure under low hydraulic gradients and specified normal loads, calculations for expressing results (including temperature correction), and test reporting; informative annexes give worked examples and guidance.

Q: Who typically uses it?

A: Geotechnical and civil engineers, geosynthetics manufacturers and designers, independent testing laboratories, standards committees, and researchers conducting product performance evaluation and quality control.

Q: Is it current or superseded?

A: ISO 12958-2:2020 is the current published Part 2 performance test (published October 2020). It, together with ISO 12958-1:2020 (index test), supersedes the earlier ISO 12958:2010 which has been withdrawn.

Q: Is it part of a series?

A: Yes — it is Part 2 of the ISO 12958 series; Part 1 (ISO 12958-1:2020) provides an index test and Part 2 provides the performance test. The series addresses determination of in‑plane water flow capacity for geotextiles and related products.

Q: What are the key keywords?

A: Geotextile, in‑plane flow, water flow capacity, constant‑head, performance test, hydraulic gradient, soil boundary, ISO 12958-2:2020.