ASTM D4716, D6574 Transmissivity of Geosynthetics

This video describes ASTM D4716 “Standard Test Method for Determining the (In-Plane) Flow Rate per Unit Width and Hydraulic Transmissivity of a Geosynthetic Using a Constant Head” and ASTM D 6574 “Standard Test Method for Determining the In-Plane Hydraulic Transmissivity of a Geosynthetic by Radial Flow.” These test methods attempt to model specific field conditions of normal pressure, gradient and boundary condition such as site-specific soils. The goal of the test is to determine the flow rate per unit width of water within the plane of the geosynthetic. These methods were originally developed by the Geosynthetic Research Institute (GRI) under the auspices of the Geosynthetic Institute (GSI), with the cooperation of the member organizations and later adopted by both ASTM International and ISO.
GSI constitutes a diverse assembly of stakeholders who actively engage in the manufacturing, design and use of geosynthetics as engineering materials. GSI’s mission is to develop and transfer knowledge, assess and critique geosynthetics, and provide service to its member organizations. One of the major objectives of the institute is to develop test methods, guides, practices and specifications of geosynthetics used in Civil Engineering applications all over the world.
For further information, please consult our website: www.geosynthetic-institute.org.

[@MiguelDuque-c1g]

Thank you! Very helpful video!!!

[@filipepedro563]

Nice video. I have one question. What is the use of the tube exiting the middle of specimen holder?

[@aladinabrash7465]

Thanks for your this informative video.
I have one question, during the calculation of the transmissivity of geocomposite under an specific pressure
For calculating the applied stress , Should we follow ASTM D6364 section 10.2.2 where the cross section of the sample (supporting area) is used instead of using the total area of the sample