ASTM D7880/D7880M-22 PDF
Standard Test Method for Determining Flow Rate of Water and Suspended Solids Retention from a Closed Geosynthetic Bag
Standard Test Method for Determining Flow Rate of Water and Suspended Solids Retention from a Closed Geosynthetic Bag
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 5
- Дата публикации:
- 1 декабря 2022 г.
- Издание:
- D7880/D7880M
- ICS:
- 55.080
SIGNIFICANCE AND USE 5.1 This test method may be used as an aid to design geotextile container systems that contain fine-grained, high water content slurries such as dredged materials to meet special environmental or operational requirements. This test is often used to demonstrate the efficacy of geotextile dewatering to regulatory agencies in determining the amount of dredged material sediment passing through a geotextile and the flow rate for specific high water content materials. 5.2 The designer can use this test method to assess the quantity of fine-grained dredged material sediment that may pass through the geotextile container into the environment. 5.3 This test method is intended for evaluation of a specific material, as the results will depend on the specific high water content slurry and geotextile evaluated and the location of the geotextile container below or above water. It is recommended that the user or a design representative perform the test because geotextile manufacturers are not typically equipped to handle or test fine-grained slurries. 5.4 This test method provides a means of evaluating geotextile containers with different dredged materials or high water content materials under various conditions. The number of times this test is repeated depends on the users and the test conditions. 5.5 This test method may not simulate site conditions and the user is cautioned to carefully evaluate how the results are applied. SCOPE 1.1 This test method is used to determine the flow rate of water and suspended solids through a geosynthetic permeable closed bag used to contain high water content slurry such as dredged material. 1.2 The results for the water and sediment that pass through the geotextile bag are shown as liters of water per time period, and the percent total suspended solids in milligrams per liter or parts per million. 1.3 The flow rate is the average rate of passage of a quantity of solids and water through the bag over a specific time period. 1.4 This test method requires several pieces of specified equipment such as an integrated water sampler, analytical balance, geotextile bag, stand clear PVC pipes, testing frame, and clean containers to collect the decant water and a representative sample of high water content material from the proposed dredge area or slurry source. 1.5 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. 1.6 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. 1.7 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 D7880/D7880M-22 is the internationally recognized standard test method for determining the flow rate of water and the retention of suspended solids from a closed geosynthetic bag. Published by ASTM International, this method is primarily intended for the evaluation and design of geotextile container systems, especially for applications involving fine-grained, high water content slurries such as dredged materials. The standard aids both designers and regulatory agencies in assessing geotextile bag performance in terms of permeability, sediment capture, and dewatering efficiency.
Geotextile containers, such as bags or tubes, are frequently used to contain and dewater slurry materials as part of environmental, civil, and geotechnical engineering projects. ASTM D7880/D7880M-22 provides a uniform approach for quantifying water flow and suspended solids escape, which is crucial for meeting project-specific environmental or operational requirements.
Key Topics
- Test Objective: To measure the average flow rate and suspended solids passing through a geosynthetic bag containing high-water-content materials, typically fine-grained dredged sediments.
- Metrics: Results are expressed as liters of water per time period and as total suspended solids in milligrams per liter (mg/L) or parts per million (ppm).
- Equipment Requirements: Utilizes specific apparatus including an integrated water sampler, geotextile bag, PVC stand pipes, analytical balance, filtration equipment, and collection containers.
- Test Material: Requires representative samples of both the geotextile and the slurry to accurately simulate field conditions and obtain meaningful, site-specific results.
- Result Interpretation: Flow rate data and sediment retention results are used to compare the effectiveness of various geotextile bag constructions and materials under different operational or environmental scenarios.
- Applicability: This method is an index test, meaning it provides comparative results for different systems but may not fully replicate site conditions.
- Safety & Compliance: Users must ensure compliance with appropriate safety, health, and environmental regulations and confirm local applicability.
Applications
ASTM D7880/D7880M-22 is widely used in areas where management of high water content sludge or slurry is required, such as:
- Dredged Material Dewatering: Assessing and designing geotextile containers for efficient sediment retention during dewatering operations.
- Environmental Protection: Demonstrating geotextile efficacy to regulatory agencies concerned with sediment migration and water quality.
- Civil Engineering Projects: Supporting construction activities involving excavation, lagoon closure, or mine waste management where sludge needs to be contained and water separated.
- Product Comparison and Quality Control: Allowing infrastructure designers and engineers to compare different geotextile bag configurations and materials for optimal performance.
- Regulatory Submittals: Providing verifiable data for compliance documentation when seeking project approvals or environmental permits.
Related Standards
Several ASTM standards complement or provide reference context for ASTM D7880/D7880M-22:
- ASTM D123: Terminology Relating to Textiles
- ASTM D653: Terminology Relating to Soil, Rock, and Contained Fluids
- ASTM D4354: Practice for Sampling of Geosynthetics and Rolled Erosion Control Products (RECPs) for Testing
- ASTM D4439: Terminology for Geosynthetics
Practical Value
By standardizing the methodology for evaluating geotextile container performance, ASTM D7880/D7880M-22 ensures that stakeholders can reliably:
- Quantify and control sediment loss and water flow during dewatering
- Meet stringent regulatory and environmental requirements
- Select suitable geosynthetic bags and materials for site-specific conditions
- Protect natural resources by minimizing the environmental impact of sediment-laden water discharges
Keywords: ASTM D7880, suspended solids, geotextile containers, dredged materials, flow rate, sediment retention, geosynthetic bag, dewatering, environmental protection, slurry containment
Технические детали
- Технический комитет
- D35 - Geosynthetics
- SKU
- ASTM D7880/D7880M-22
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