ISO 12958-1:2020 PDF

Name: ISO 12958-1:2020 — Geotextiles and geotextile-related products — Determination of water flow capacity in their plane — Part 1: Index test
SKU: ISO 12958-1:2020
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Geotextiles and geotextile-related products — Determination of water flow capacity in their plane — Part 1: Index test

Название (английский):

ISO 12958-1:2020

Geotextiles and geotextile-related products — Determination of water flow capacity in their plane — Part 1: Index test

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 14
Дата публикации:: 20 октября 2020 г.
Издание:: ISO IS 12958 edition 1 version 1
ICS:: 59.080.70

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Описание (английский):

This document specifies a method for determining the constant-head water flow capacity within the plane of a geotextile or geotextile-related product. This document describes the in-plane water flow index test, only applicable to factory-assembled products. For the in-plane water flow performance test, see ISO 12958-2.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview - ISO 12958-1:2020 (Geotextiles in‑plane water flow index test)

ISO 12958-1:2020 specifies an index test method to determine the constant‑head in‑plane water flow capacity of geotextiles and geotextile‑related products (factory‑assembled products only). The standard measures volumetric flow per unit width under defined normal compressive stresses and hydraulic gradients, providing a repeatable indication of how water flows parallel to the plane of the product. This part of the series complements ISO 12958-2, which covers the full in‑plane water flow performance test.

Key topics and technical requirements

Scope: Index test for in‑plane water flow capacity of factory‑assembled geotextile products.

Measured quantities: in‑plane flow Q, in‑plane water flow capacity q_p_index(σ/i), hydraulic gradient i, and normal compressive stress σ.

Test principle: constant‑head apparatus measuring flow along the specimen under varying σ and typical hydraulic gradients.

Apparatus requirements:

Maintain constant head for hydraulic gradients at least 0.1 and 1.0.
Discharge head ≤ 100 mm (corrections required if exceeded).
Loading mechanism to apply constant normal stress within ±5%.
Contact surfaces: closed‑cell foam rubber (F) or smooth rigid membrane (R); report boundary used.
Minimum apparatus dimensions: width ≥ 0.2 m, effective flow length ≥ 0.3 m; handle specimen thicknesses up to 50 mm.
Apparatus leakage ≤ 5% of actual test flow.

Water quality & conditions:

Temperature typically 18–22 °C (preferably near 20 °C).
Dissolved oxygen ≤ 10 mg/kg (to avoid air‑clogging).
Water filtered; recirculation permitted with temperature control.

Specimens:

Cut three specimens in machine direction and three in cross‑machine direction.
Typical minimum dimensions: length ≥ 0.3 m (flow direction), width ≥ 0.2 m.
Handle specimens flat and avoid folding.

Reporting & calculations: procedures for calculating q_p_index, corrections for temperature, graphical representation, and required test report content.

Applications

Assessing drainage capacity and lateral transmissivity of geotextiles and geocomposites.

Quality control and comparability of factory‑assembled drainage layers used in:

Landfill and subbase drainage systems
Road and railway subdrainage
Retaining wall and slope drainage
Stormwater management and erosion control systems

Providing index values for design selection, product datasheets, and procurement specifications.

Related standards

ISO 12958-2 - In‑plane water flow performance test

ISO 9862 - Sampling and specimen preparation

ISO 9863-1 - Thickness determination (single layers)

ISO 5813 - Dissolved‑oxygen determination

ISO 2854 - Statistical interpretation of data

ISO 10320 - Geosynthetics identification

Keywords: ISO 12958-1:2020, geotextiles, in‑plane water flow, water flow capacity, index test, geosynthetics, hydraulic gradient, constant‑head apparatus.

ISO 12958-1:2020 PDF

Abstract

Похожие стандарты

Overview - ISO 12958-1:2020 (Geotextiles in‑plane water flow index test)

Key topics and technical requirements

Applications

Who should use this standard

Related standards

Технические детали

BS EN ISO 12958-2:2020

Geotextiles and geotextile-related products. Determination of water flow capacity in their plane. Performance…

SIST EN ISO 9862:2024

Geosynthetics - Sampling and preparation of test specimens (ISO 9862:2023)

ISO 9863-1:2016/Amd 1:2019

Geosynthetics — Determination of thickness at specified pressures — Part 1: Single layers — Amendment 1

SIST EN 25813:1996

Water quality - Determination of dissolved oxygen - Iodometric method (ISO 5813:1983)

SIST ISO 28540:2012

Water quality - Determination of 16 polycyclic aromatic hydrocarbons (PAH) in water - Method using gas chroma…

SIST EN ISO 10320:2019

Geosynthetics - Identification on site (ISO 10320:2019)