ISO 12958-2:2020 PDF

Geotextiles and geotextile-related products — Determination of water flow capacity in their plane — Part 2: Performance test

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Title (English):

ISO 12958-2:2020

Geotextiles and geotextile-related products — Determination of water flow capacity in their plane — Part 2: Performance test

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 16
Publication date:: October 21, 2020
Edition:: ISO IS 12958 edition 1 version 1
ICS:: 59.080.70

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Description (English):

This document specifies a method for determining the constant-head water flow capacity within the plane of a geotextile or geotextile-related product, using boundary materials and test conditions of interest. A standard series of test conditions are proposed, involving soil confinement, low hydraulic gradients, seating times and an array of normal loads.

Technical details

Technical committee: ISO/TC 221 - Geosynthetics
SKU: ISO 12958-2:2020

Abstract

Overview

ISO 12958-2:2020 specifies a performance test method to determine the constant-head in-plane water flow capacity of geotextiles and geotextile-related products. The standard defines how to measure volumetric flow per unit width under representative field-like conditions using project-specific boundary materials (for example soils), a range of normal compressive stresses, seating times and low hydraulic gradients. It is intended to assess short- to mid-term performance (including primary creep effects) and to evaluate how contact with soils or confinement affects the product’s transmissivity.

Key Topics and Requirements

Test principle: measure steady-state flow within the plane of the geotextile at a constant head loss under defined stresses, gradient and boundary conditions.
Apparatus: constant-head in-plane flow cell capable of maintaining precise head loss; minimum useful dimensions (cell width ≥ 0.2 m, effective flow length ≥ 0.3 m); discharge head ≤ 100 mm.
Loading and control: loading mechanism must hold normal compressive stress with ≤1% or 1 kPa error; hydraulic head measurement requirements vary by gradient (pressure transducers required for gradients

Related standards

Other ISO standards

Overview

Key Topics and Requirements

Test principle: measure steady-state flow within the plane of the geotextile at a constant head loss under defined stresses, gradient and boundary conditions.
Apparatus: constant-head in-plane flow cell capable of maintaining precise head loss; minimum useful dimensions (cell width ≥ 0.2 m, effective flow length ≥ 0.3 m); discharge head ≤ 100 mm.
Loading and control: loading mechanism must hold normal compressive stress with ≤1% or 1 kPa error; hydraulic head measurement requirements vary by gradient (pressure transducers required for gradients

ISO 12958-2:2020 PDF

Technical details

Abstract

Overview

Key Topics and Requirements

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Overview

Key Topics and Requirements

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