ASTM D5323-19a(2023) PDF
Standard Practice for Determination of 2 % Secant Modulus for Polyethylene Geomembranes
Standard Practice for Determination of 2 % Secant Modulus for Polyethylene Geomembranes
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 4
- Дата публикации:
- 1 мая 2023 г.
- Издание:
- D5323
- ICS:
- 59.080.70
SIGNIFICANCE AND USE 4.1 Where to draw the tangent to determine the modulus of elasticity is often unclear when performing tensile tests with polyethylene geomembranes. This problem results in a wide variation in test results and, therefore, makes this property unreliable for comparisons. 4.2 A secant modulus based on 2 % strain can be useful when making comparisons between materials, in quality control, and in comparing the same sample after being subjected to a nonstandard environment. 4.3 Secant modulus is an approximation of modulus of elasticity and generally results in a lower value than that for the modulus of elasticity. 4.4 Although the technique for measuring 2 % secant modulus is described here, other percent secant moduli can be measured by this practice. SCOPE 1.1 This practice presents a technique for calculating the 2 % secant modulus for polyethylene geomembranes between 0.5 mm and 5 mm (20 mil and 200 mil) using Test Method D6693/D6693M. 1.2 This practice will facilitate modulus comparisons of similar materials by standardizing the method for deriving the points on the stress-strain curve from which the calculations are performed. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.4 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. 1.5 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 D5323-19a(2023) is the internationally recognized standard practice for the determination of the 2 % secant modulus in polyethylene geomembranes with thicknesses between 0.5 mm and 5 mm (20 mil and 200 mil). Published by ASTM International, this standard standardizes the characterization of mechanical properties of polyethylene geomembranes by ensuring consistency and reliability in modulus measurements. The use of the 2 % secant modulus, determined through tensile testing, provides a comparative value that is vital for quality control, material comparison, and evaluation following exposure to variable environments.
Key Topics
- 2 % Secant Modulus: Defined as the ratio of stress to corresponding strain at 2 % elongation. For polyethylene geomembranes, this value is an approximation of the modulus of elasticity and typically lower than the actual elastic modulus.
- Standard Test Method: Specifies calculations using tensile testing according to ASTM D6693/D6693M, promoting consistency in results.
- Reproducibility and Precision: This standard provides clarity on the points used from the stress-strain curve, minimizing ambiguity in tangent selection and reducing result variability.
- Compensation Procedures: Includes guidance on compensating for test artifacts such as slack removal (toe compensation) and pre-stress to ensure accuracy.
- Reporting Requirements: Outlines the requirement to report the average 2 % secant modulus and standard deviation from multiple specimens.
- Scope of Applicability: Applicable to unreinforced polyethylene geomembranes with specified dimensions.
Applications
The 2 % secant modulus determination for polyethylene geomembranes has several critical applications in the geosynthetics industry:
- Material Comparison: Enables reliable comparison between different polyethylene geomembranes, supporting material selection and specification in engineering projects.
- Quality Control: Assists manufacturers and quality assurance teams in monitoring production consistency and ensuring materials meet specified mechanical performance.
- Performance Evaluation: Useful for comparing the same geomembrane sample before and after exposure to nonstandard or aggressive environments, supporting durability assessments.
- Regulatory Compliance: Facilitates adherence to international guidelines and industry practices for mechanical testing and reporting.
- Research and Development: Provides a standardized methodology for researchers developing new geomembrane formulations or conducting long-term performance studies.
Related Standards
For comprehensive geomembrane characterization and terminology, the following ASTM standards are referenced:
- ASTM D6693/D6693M: Test Method for Determining Tensile Properties of Nonreinforced Polyethylene and Nonreinforced Flexible Polypropylene Geomembranes - the primary test method referenced for conducting tensile tests in this practice.
- ASTM D883: Terminology Relating to Plastics - provides definitions integral to the plastics industry, including modulus terminology.
- ASTM D4439: Terminology for Geosynthetics - covers key terms and concepts for geosynthetic materials used in civil engineering and environmental applications.
Practical Value
Implementing ASTM D5323-19a(2023) allows professionals to:
- Achieve consistent and accurate measurement of the secant modulus for polyethylene geomembranes.
- Improve comparability of test data across manufacturers and projects, which is crucial for procurement and performance validation.
- Enhance project reliability with standardized quality benchmarks.
- Ensure alignment with international trade and regulatory requirements, as this standard was developed under World Trade Organization principles for international standardization.
By adopting ASTM D5323-19a(2023), stakeholders reinforce best practices in geomembrane testing and material verification, supporting safer, more effective geotechnical and environmental applications.
Keywords: ASTM D5323, secant modulus, polyethylene geomembranes, tensile testing, quality control, modulus comparison, geosynthetics.
Технические детали
- Технический комитет
- D35 - Geosynthetics
- SKU
- ASTM D5323-19a(2023)
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