ASTM D6574 Hydraulic Transmissivity Testing for Geosynthetics by Radial Flow
ASTM D6574 describes how to use a radial flow device to determine the in-plane transmissivity of geosynthetics under various normal compressive loads. The test is designed to be an index test for geotextiles or geotextile-like materials. The values stated in SI are considered as standard.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM D6574 is a standard test method for determining the hydraulic transmissivity of geosynthetic drainage materials using a radial flow configuration. Transmissivity measures a geosynthetic’s capacity to conduct water within its plane, which is critical for drainage and filtration applications.
The radial flow approach simulates realistic field conditions where water moves outward or inward through a geosynthetic under compressive stress. This method is particularly relevant for geosynthetic drainage composites, geonets, and geotextiles used in civil, environmental, and geotechnical engineering applications.
Scope, Applications, and Benefits
Scope
ASTM D6574 evaluates:
- In-plane hydraulic transmissivity under radial flow conditions
- Effect of compressive stress on drainage capacity
- Performance at varying hydraulic gradients
- Drainage behavior of geosynthetics under simulated field loading
Applications
- Landfill leachate collection and drainage systems
- Retaining wall drainage layers
- Sports field and golf course drainage
- Road and highway subgrade drainage
- Slope stabilization and earth fill drainage
Benefits
- Simulates realistic radial field drainage conditions
- Accounts for compressive stress effects on geosynthetic performance
- Supports design of efficient drainage systems
- Enables comparison and selection of drainage geosynthetics
- Provides data for regulatory and engineering compliance
Test Process
Specimen Preparation
Circular geosynthetic specimen is cut to required diameter and conditioned per standard requirements.
1Test Setup
Specimen is placed in the radial flow device, subjected to specified normal stress, and saturated with water.
2Flow Measurement
Water is introduced at the center (or perimeter), and flow rate and hydraulic head are measured at multiple points under steady-state conditions.
3Transmissivity Calculation
Hydraulic transmissivity is calculated from flow rate, hydraulic gradient, and specimen geometry and reported.
4Technical Specifications
| Parameter | Details |
|---|---|
| Test Principle | Radial in-plane flow under compressive normal stress |
| Applicable Materials | Geonets, geocomposites, drainage geotextiles |
| Standard | ASTM D6574 |
| Measured Output | Hydraulic transmissivity (m²/s) |
| Normal Stress Range | As specified per application requirements |
| Flow Condition | Steady-state laminar flow |
Instrumentation Used for Testing
- Radial flow transmissivity test device
- Normal stress application system (deadweight or pneumatic)
- Differential pressure transducers and flow meters
- Water reservoir and constant head supply
- Data acquisition system
Results and Deliverables
- Hydraulic transmissivity values (m²/s) at specified normal stresses
- Flow rate vs. hydraulic gradient data
- Stress-transmissivity relationship curves
- Comparative performance data for material selection
- Design support documentation for drainage system engineering
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Frequently Asked Questions
Transmissivity is the volumetric flow rate of water conducted per unit width within the plane of a geosynthetic per unit hydraulic gradient. It quantifies the material's in-plane drainage capacity.
Radial flow better represents field conditions such as circular drainage sumps or well-based collection systems, and provides more uniform stress distribution on the specimen.
Higher compressive loads compress the geosynthetic, reducing its thickness and flow channels, which typically decreases transmissivity. Testing at design-level stress is therefore critical.
ASTM D6574 is applicable to geonets, drainage geocomposites, thick nonwoven geotextiles, and other geosynthetics used for in-plane drainage.
Engineers use transmissivity values to size drainage layers, verify compliance with design flow requirements, and select geosynthetics capable of handling anticipated drainage loads under field stress conditions.
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