ASTM D4491/D4491M-22 PDF
Standard Test Methods for Water Permeability of Geotextiles by Permittivity
Standard Test Methods for Water Permeability of Geotextiles by Permittivity
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 8
- Дата публикации:
- 1 мая 2022 г.
- Издание:
- D4491/D4491M
- ICS:
- 59.080.70
SIGNIFICANCE AND USE 5.1 These test methods are considered satisfactory for acceptance testing of commercial shipments of geotextiles since the methods have been used extensively in the trade for acceptance testing. 5.1.1 In case of a dispute arising from differences in reported test results when using these test methods for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question. The test specimens should then be randomly assigned in numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student's t-test for unpaired data and an acceptable probability level chosen by the two parties before the start of testing. If a bias is found, either its cause must be found and corrected, or the purchaser and the supplier must agree to interpret future test results in light of the known bias. 5.1.2 When the dispute involves test results produced with either the Method B falling head test or the Method C air flow test, the Method A constant head test performed with a 50 mm head should be used as the referee method. 5.1.3 When the dispute involves Method C, the actual water temperature used for the water flow tests must be recorded and the viscosity of water at the test temperature must be used in the conversion from the air flow to water flow as described in Section 16, without the application of the temperature correction. 5.1.4 Permittivity is an indicator of the quantity of water that can pass through a geotextile in an isolated condition. 5.1.5 As there are many applications and environmental conditions under which a geotextile may be used, care should be taken when... SCOPE 1.1 These test methods cover procedures for determining the hydraulic conductivity (water permeability) of geotextiles in terms of permittivity under standard testing conditions, in the uncompressed state. Included are three procedures: the constant head and falling head methods using a water flow apparatus, and the air flow method using an air flow apparatus. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM D4491/D4491M-22: Standard Test Methods for Water Permeability of Geotextiles by Permittivity provides procedures for determining the hydraulic conductivity (water permeability) of geotextiles through measurement of permittivity under standard, uncompressed conditions. These test methods are crucial for the acceptance testing of commercial shipments of geotextiles, ensuring product consistency and performance across a wide range of environmental applications.
The standard describes three test procedures: constant head, falling head (both using water flow), and an air flow method. These tests are instrumental for characterizing the ability of geotextiles to transmit water, supporting their selection and use in geotechnical engineering projects such as drainage, filtration, and soil stabilization.
Key Topics
- Permittivity Measurement: Focuses on determining the rate of water flow per unit of cross-sectional area per unit head through a geotextile under laminar flow conditions. Permittivity is a key indicator of geotextile performance.
- Constant Head Test (Method A): Maintains a steady 50 mm head of water on the geotextile, serving as the referee test for resolving result disputes and for products with high flow rates.
- Falling Head Test (Method B): Suitable for lower permeability geotextiles, measures water flow as the head decreases over time.
- Air Flow Test (Method C): Measures airflow through the geotextile and converts this value to water flow, useful for quality control and comparative testing.
- Sampling and Specimen Preparation: Includes guidance for representative sampling from commercial rolls and specimen preparation procedures to ensure accurate, reproducible results.
- Data Integrity: The standard outlines dispute resolution in case of differences in reported results, recommending comparative laboratory testing and statistical analysis to determine and resolve bias.
- Safety and Compliance: Emphasizes adherence to proper safety, health, and environmental practices during testing.
Applications
The ASTM D4491/D4491M-22 standard is widely used in:
- Construction and Civil Engineering: Assessing geotextiles for use in drainage systems, filtration, embankment stabilization, retaining walls, and erosion control.
- Quality Control: Acceptance testing of geotextile shipments to ensure products meet specified permeability requirements, supporting procurement decisions and regulatory compliance.
- Research and Development: Characterizing new geotextile materials during product development or for performance benchmarking.
- Dispute Resolution: Providing impartial methods for resolving discrepancies between suppliers and purchasers, enhancing transparency in supplier-customer relationships.
Testing geotextiles by permittivity is especially valuable because it provides a direct, standardized comparison between different materials, regardless of thickness or structure. This ensures that performance in controlled lab settings can be reliably translated to field expectations, with clear documentation supporting specification compliance and selection.
Related Standards
- ASTM D123: Terminology Relating to Textiles
- ASTM D653: Terminology Relating to Soil, Rock, and Contained Fluids
- ASTM D4439: Terminology for Geosynthetics
- ASTM D5199: Test Method for Measuring the Nominal Thickness of Geosynthetics
- ASTM E691: Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
These related ASTM standards assist in ensuring measurement consistency, clear terminology, and interoperability of test data across various applications in materials testing and civil engineering.
Keywords: water permeability, permittivity, geotextiles, ASTM D4491, hydraulic conductivity, constant head test, falling head test, air flow test, geotechnical engineering, quality control
Технические детали
- Технический комитет
- D35 - Geosynthetics
- SKU
- ASTM D4491/D4491M-22
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