DIN 60500-4:2024-02
Geotextiles and geotextile related products - Part 4: Determination of permeability normal to the plane under load at constant hydraulic water head

Standard No.

DIN 60500-4:2024-02

Release Date

2024

Published By

German Institute for Standardization  DE  /  DIN

Latest

DIN 60500-4:2024-02

Introduction

Analysis of the Standard's Core Content

DIN 60500-4:2024 specifies a standardized method for determining the vertical plane permeability of geotextiles and related products under conditions of constant hydraulic pressure differential. This standard replaces the 2007 edition and primarily updates the test equipment specifications, sample pretreatment procedures, and reporting requirements.

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Comparison of key test parameters

Test type	Loading method	Accuracy requirements	Applicable products
Stress dependence test	2-200kPa normal stress	±5% stress control	Conventional geotextiles
Thickness dependence test	Preset thickness loading	±0.1mm thickness control	Structural special-shaped products

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Test equipment technical specifications

The penetration tester must meet the following requirements:

• Cylindrical test chamber with inner diameter ≥130mm
• Perforated plate with porosity ≥40% (pore size 5-10mm)
• Height-adjustable water level control system
• ±0.1mm head difference measurement accuracy

Case: For open-cell geogrids, a thickness-dependent test mode is required, and the thickness values under various stresses are pre-determined using DIN EN ISO 9863-1.

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Key points of sample processing

1. After sampling, soak in water containing 0.1% non-ionic surfactant for ≥12 hours
2. Degassing at 80Pa negative pressure for 15 minutes
3. The total thickness of multi-layer specimens is recommended to be controlled between 2-4cm (under 2kPa)

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Data processing formula

Calculation formula for permeability coefficient after water temperature correction:

k_n = (Q×d_n×R_T20) / (A×n×Δh)

Where R_T20 is the water temperature correction coefficient: 1.762 + 0.0337T + 0.00022T²

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Recommendations for standard implementation

• For hydraulic gradients of i>2, laminar flow conditions must be verified.
• The report should include perforated plate technical parameters (porosity/pore size distribution).
• It is recommended to use a three-layer specimen to improve the testing accuracy of thin materials.

DIN 60500-4:2024-02 Referenced Document

• DIN EN ISO 9862 Geosynthetics - Sampling and preparation of test specimens (ISO 9862:2023); German version EN ISO 9862:2023
• DIN EN ISO 9863-1 Geosynthetics - Determination of thickness at specified pressures - Part 1: Single layers (ISO 9863-1:2016 + Amd.1:2019); German version EN ISO 9863-1:2016 + A1:2019

DIN 60500-4:2024-02 history

• 2024 DIN 60500-4:2024-02 Geotextiles and geotextile related products - Part 4: Determination of permeability normal to the plane under load at constant hydraulic water head
• 2024 DIN 60500-4:2024 Geotextiles and geotextile related products - Part 4: Determination of permeability normal to the plane under load at constant hydraulic water head
• 2023 DIN 60500-4:2023-05 Geotextiles and geotextile related products - Part 4: Determination of permeability normal to the plane under load at constant hydraulic water head / Note: Date of issue 2023-03-31*Intended as replacement for DIN 60500-4 (2007-12).
• 2023 DIN 60500-4 E:2023 Draft Document - Geotextiles and geotextile related products - Part 4: Determination of permeability normal to the plane under load at constant hydraulic water head
• 2007 DIN 60500-4:2007-12 Geotextiles and geotextile related products - Part 4: Determination of permeability normal to the plane under load at constant hydraulic water head
• 2007 DIN 60500-4:2007 Geotextiles and geotextile related products - Part 4: Determination of permeability normal to the plane under load at constant hydraulic water head

Standard and Specification