How to install and commission a geosynthetic impermeability meter?
Installation and Usage:
1. Pressure Setup: After turning on the device, press the "Back" button to enter the setting mode. Use the ">>" key to navigate and adjust the pressure value using the "+" and "-" keys. Once the desired value is set, press "Back" again to save. After adjusting the lower limit, press the "Set" key to exit. For example, after setting the lower limit of 8 hours, the pressure should be raised to 0.1 MPa.
2. Time Reset: To reset the time, redo the experiment and keep pressing the "--" button without releasing it. The display will first show the time value, and after 10 seconds, the timer will restart from 0 hours. Be careful not to press the "!" key by mistake.
3. Time Review: Press the "--" key to switch to hour display mode. The upper limit shows minutes, while the lower limit shows seconds. After 30 seconds, the system will automatically return to the pressure display screen.
4. Zero Calibration: If no pressure is detected after starting, and the reading doesn’t return to zero, press the "Set" key once to recalibrate. Avoid pressing the "Clear" key when there is active pressure; instead, release the pressure first and then perform the zero adjustment.
5. Water Injection: Open the water injection cover and fill it with pure water. When the tank is full, start the pump and open the pressure regulating valve to allow water to flow into the high-pressure chamber until it just begins to overflow.
6. Sample Placement: Place the sample on the net in the sump, ensuring it is flat without wrinkles. Remove any excess water to prevent air bubbles from forming in the clamp. Cover the porous plate and evenly secure the sample. For composite materials with membranes and textiles, ensure the membrane faces the water surface. If both sides are textile, one side can be carefully peeled back, and an adhesive like glass glue may be used to prevent leaks in the gripping area.
7. Pressure Adjustment: Slowly open the inlet valve to increase the pressure in the clamp to 0.1 MPa. If the approximate hydrostatic pressure resistance of the sample is known, you can directly apply the lower end of that range and maintain it for at least 1 hour. Observe if water appears in the pores of the perforated plate. If no seepage occurs, gradually increase the pressure in 0.1 MPa steps, maintaining each level for at least 1 hour. If water appears, it indicates the presence of holes or damage. The hydrostatic pressure resistance is measured to the nearest 0.1 MPa.
8. Flow Rate Evaluation: If using a device specified in GB/T 19979.2, evaluate the seepage flow rate. A very low flow rate under a certain pressure suggests no seepage. A rapid increase in flow indicates damage, and the test should be stopped.
Note: If a water droplet appears in the hole of the perforated plate, wipe it off. If no further seepage occurs, it may be due to edge overflow, and the test can continue. If water continues to seep, stop the test immediately. If only a specific pressure resistance is required, apply that pressure for at least 1 hour. If no seepage occurs, the sample meets the standard. If the results vary significantly (more than 50% difference between the lowest two values), additional samples should be tested.
9. Final Calculation: Use the lowest of the three measured hydrostatic pressure values as the result. If the value exceeds 3, use the average of the two lowest values. If the lowest value is more than 50% less than the next, discard it. Follow relevant standards for final reporting.
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