Geosynthetics vertical permeability tester Overview basis JTGE50-2006, ISO11508: 1999 national standard R & D within the plane of geosynthetics water flow. Measure applicable to all types of geotextile material vertical penetration, stable performance, convenient and practical. Two. Geosynthetics vertical permeability tester technical parameters: 1 Sample size: ф80mm 2. Dimensions: 600X750X1900 3. Total Weight: 150Kg three. Geosynthetics use a vertical penetration tester, the sample is placed in water containing a wetting agent, at least until saturated and soaked 12h off bubbles. Sodium alkylbenzene using sulfur, the wetting agent 0.1% V / V in. 2. Remove the high voltage compartment (see Figure 12 between instruments) Install the specimen (5) to the holder (6), sample requirements: the sample should be clean surface dirt, no visible dirt or creases, not folded, and should be placed at the level of the above shall not impose any load. Then install the high-pressure position, followed by high-pressure positions counterweight tighten the nut. 3, open-pass valve (3) by (1) injecting clean water to high pressure tank (2). Until it reaches the water level on both sides of the head difference of 50mm (11). Turn off the water supply, if the head of the specimen can not be on both sides of the balance within 5min, find out if there is clean air is not ranked. Open (13) re-vent the exhaust valve. And noted in the test report. 4, adjust the water flow, so that the head difference reaches 70mm ± 5mm, record this value. Accurate to 1mm. After 30s head within a predetermined stable time period, with the collection cylinder (8) collecting the permeate flow rate of permeated water through the tube, the exact volume of 10mL, time accurate to s, the permeate flow rate to collect 1000mL, for at least 30s. 5, respectively, the maximum head differential is 0.8, 0.6, 0.4 and 0.2 times the head difference. 2.3.4 Repeat the above procedure, the maximum flow rate from the beginning to the end of the minimum flow rate, and the corresponding record of the permeate flow rate and time. 6, the recording temperature, accurate to 0.2 ℃. 7, the results of calculations based on the appropriate standard T1141-2006's please. Four. Test finished playing open valve (4), drain all parts of water. Clean the surface of the instrument. Five. Test report The test report shall include the following: 1. 2 said sample name, specifications and status description; describe the state of 3 samples; 4 trial date; 5 permeability tester specifications, the main technical means 6 mark 7. ; 8 specimens effective over the water area; 9. all permeability measurement, the flow rate of each set of 10 samples of head loss curve; 11. velocity 50mm head difference means 12 when the number (VI50), as given vertical permeability and water permeability; 13 temperature range; 14 water supply and dissolved oxygen values; 15. detailed description of any deviations from the prescribed procedures.