The Soil/Geotextile Permeameter measures permeability and clogging characteristics of soil-geotextile systems and meets the requirements of the older, but still popular ASTM D5101-01 (2006) test method. The test determines the compatibility of various types of geotextiles with cohesionless soils by measuring hydraulic gradient, system permeability, and gradient ratio. A 4in (102mm) diameter composite sample is prepared in the permeameter and tested with water in unidirectional flow.
The Permeameter apparatus consists of three acrylic chambers with a total of six manometer ports. Water is supplied through an inlet in the top acrylic chamber, hydraulic gradient is measured through one port in the top chamber, four ports in the middle chamber, and a port in the bottom chamber. Water exits through the outlet in the bottom cap. The anodized aluminum top and bottom caps are fitted with vent valves. Each manometer port is fitted with a No. 100 (150μm) wire mesh filter disc to inhibit algae growth and prevent soil fines from migrating to the manometer.
The assembly includes two 4in (102mm) diameter No. 4 (5mm) support screens and two 150μm (No. 100) soil support screens. The permeameter rests on a sturdy base and is held together with three stainless steel clamping rods. A soil leveling tool is included to maintain proper soil height in the chamber during sample preparation. The Six Manometer Panel is required for proper operation and is sold separately.
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