DIN EN ISO 12958-2 E 2019-05 PDF

Full title and description

STB DIN EN ISO 12958-2 E 2019-05 — Geotextiles and geotextile-related products — Determination of water flow capacity in their plane — Part 2: Performance test. Note: the given designation ("STB" and date "2019-05") appears to combine different national prefixes and an earlier date; the international standard ISO 12958-2 was published as ISO 12958-2:2020 and adopted in national/EN/DIN collections subsequently (German adoption: DIN EN ISO 12958-2 published May 2021).

Abstract

This standard specifies a laboratory performance test method for determining the constant‑head in‑plane water flow capacity of geotextiles and geotextile‑related products. The method uses representative boundary materials and test conditions (soil confinement, seating time, low hydraulic gradients and a range of normal loads) to measure water flow capacity under conditions that simulate field performance. Results are reported as water flow capacity for the specified test conditions.

General information

• Status: Published / Current (international standard; also published as EN/DIN adoption).
• Publication date: ISO publication: 21 October 2020 (ISO 12958-2:2020); German adoption (DIN EN ISO 12958-2): 1 May 2021 (May 2021).
• Publisher: International: ISO (ISO/TC 221); National adoption: DIN (as DIN EN ISO 12958-2).
• ICS / categories: 59.080.70 — Geotextiles.
• Edition / version: Edition 1 (ISO 12958-2:2020); EN/DIN edition published 2021.
• Number of pages: ISO PDF: 16 pages; DIN/EN national text varies (commonly published with editorial national forewords — e.g., 26 pages in some German editions).

Key bibliographic items above are derived from the ISO bibliographic record and national adoption listings.

Scope

Defines a laboratory performance test to determine the capacity for water to flow within the plane of geotextiles and geotextile‑related products under specified boundary and loading conditions. The method is intended to simulate field confinement and conditions of use so that in‑plane hydraulic performance can be assessed and compared for design, specification and quality control purposes. It complements the part‑1 laboratory test procedures and replaces older consolidated versions of ISO 12958.

Key topics and requirements

• Performance test for constant‑head in‑plane water flow capacity under representative boundary materials and soil confinement.
• Specification of seating times and procedures to reach steady flow conditions before measurement.
• Testing across a range of low hydraulic gradients and normal loads to simulate field stresses.
• Requirements for specimen preparation, boundary material selection and sample mounting to ensure reproducible results.
• Calculation and reporting of in‑plane water flow capacity results and associated test conditions (so that values are comparable between laboratories and products).

Typical use and users

Used by geotechnical and civil engineers, geotextile and filter manufacturers, independent testing laboratories, product specification writers and purchasers, and regulatory bodies. Typical applications include evaluation of drainage performance in filter systems, landfill and soil drainage layers, roadway and embankment filtration/drainage design, and product quality control during production and acceptance testing.

Related standards

ISO 12958 series: ISO 12958-1 and ISO 12958-2 (the 2020/2021 publications supersede earlier consolidated ISO 12958 editions such as ISO 12958:2010). National and regional adoptions exist as EN ISO 12958-2 and DIN EN ISO 12958-2. Related standards in geosynthetics and testing (ISO/TC 221) cover other hydraulic and mechanical test methods for geotextiles.

Keywords

geotextiles, geotextile-related products, in-plane flow, water flow capacity, hydraulic gradient, performance test, boundary material, soil confinement, drainage, filtration.

FAQ

Q: What is this standard?

A: ISO 12958-2 is an international standard that specifies a laboratory performance test for determining the constant‑head in‑plane water flow capacity of geotextiles and geotextile‑related products; it is published as ISO 12958-2:2020 and adopted in EN/DIN collections (e.g., DIN EN ISO 12958-2, 2021).

Q: What does it cover?

A: It covers test apparatus setup, specimen confinement using boundary materials, seating procedures, selection of hydraulic gradients and normal loads, measurement of steady‑state water flow within the plane of the product, and reporting requirements so results are comparable.

Q: Who typically uses it?

A: Geotechnical engineers, product manufacturers, testing laboratories, specifiers and regulators who need controlled, reproducible measurements of in‑plane hydraulic performance for design, product selection and quality control.

Q: Is it current or superseded?

A: The ISO part‑2 document is the current international publication for the performance test (ISO 12958-2:2020). It replaces and updates earlier ISO 12958 consolidated texts (the 2010 edition was withdrawn and the series reissued in 2020). National adoptions (EN/DIN) followed in 2021.

Q: Is it part of a series?

A: Yes — ISO 12958 is a series addressing determination of water flow capacity in the plane of geotextiles; Part 2 is the performance test and is published alongside other part(s) that define laboratory procedures and related methods in the ISO 12958 series.

Q: What are the key keywords?

A: Geotextiles; in‑plane flow; water flow capacity; hydraulic gradient; performance test; boundary material; soil confinement; drainage; filtration.