LQH-10 Full-Graded Concrete Permeability Coefficient Tester
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Description
Product Introduction:
This instrument was developed and designed in accordance with the national standard SL 352-2006, “Test Procedures for Hydraulic Concrete,” specifically for determining the permeability coefficient of concrete. It features stable performance, user-friendly operation, an automatic water‑supply system powered by a pressure pump, and automated calculation of test data.
Technical Specifications:
| Parameter item | Parameter Description |
| Accuracy | 0.5% |
| Pressure range | 0.1-10MPa |
| Specimen dimensions | Standard configuration includes a φ300×300 mm mold for 3 stations (a φ450×450 mm mold is available upon request). |
| External dimensions | 970×620×1000mm 850×600×1180mm |
| Voltage | 380V |
| Overall machine weight | 150Kg |
Procedure:
Fabricate and cure specimens in accordance with the specifications for fully graded concrete.
1. Place the specimen in the test container lined with a permeable plate, and fill the space between the specimen and the mold wall with an impermeable material (for low-temperature tests, the steel mold should be preheated). Fill the lower two-thirds with hot asphalt at a temperature exceeding 80°C, and the upper one-third with a highly flexible joint‑filling material. It is advisable to add 5%–10% diesel fuel to the asphalt to reduce its hardness.
2. After the sealing material has cooled, place the test specimen and the container into the steel support frame, position the sealing ring on the top surface of the container, and tighten the lid bolts.
3. Connect the water supply and pressure source hoses to the specimen chamber, open the inlet valve to fill the upper portion of the specimen chamber with water, and close the vent valve after all air has been expelled. Then, turn on the pressure source, adjust the pressure to maintain a constant value, ensuring that the pressure fluctuation remains within ±0.1 MPa.
4. When the concrete compressive strength is below 30 MPa, the test pressure may be initiated at 0.2 MPa. Under constant pressure, increment the pressure by 0.1 MPa every 8 hours until all three specimens exhibit water leakage at their bases. Maintain the final pressure level and proceed with the permeability coefficient test: install the lower sealing cap, connect the collection bottle, and record the water volume in the bottle every 8 hours until the measured seepage volumes over successive intervals become essentially consistent.
5. When the compressive strength of concrete exceeds 30 MPa, the test pressure may be initiated at 0.5–1.0 MPa. Under constant pressure, increase the pressure by 0.4 MPa every 8 hours until water leakage occurs in three specimens.
Record the volume of water discharged, and plot the cumulative discharge versus time on a Cartesian graph. When the curve becomes a straight line, it indicates that the flow rate has stabilized, and the experiment may be terminated.
6. After the test is completed, remove the specimen container from the test unit, heat to soften the asphalt sealing material, and extract the specimen.
The permeability coefficient test for fully graded concrete has been completed. Open the pressure‑relief valve of the high-pressure chamber, clean the instrument’s exterior, close the lid of the standard test chamber, and thoroughly dry and lubricate the base of the high-pressure chamber with anti‑rust grease. If the equipment will remain idle for an extended period, open the drain valve located at the lower right side of the main unit to completely empty the system, thereby preventing freeze‑induced cracking.
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