**Asphalt Concrete Permeameter**
**I. Overview**
The asphalt concrete permeameter is designed in accordance with the DL/T 5362-2006 standard for hydraulic asphalt concrete testing, specifically to measure the permeability coefficient of asphalt concrete. This device is commonly used in conjunction with the constant and variable head water tests, which are essential methods for evaluating the water flow characteristics through the material.
**II. Purpose and Application**
This asphalt concrete permeameter complies with the technical requirements outlined in the DL/T 5326-2006 standard issued by the Ministry of Power. It is primarily used to determine the permeability coefficient of asphalt concrete samples. The constant head test is suitable for specimens with high permeability, while the variable head test is ideal for materials with low permeability. This flexibility ensures accurate results across a wide range of asphalt mixtures.
**III. LSY-2 Asphalt Concrete Permeation Instrument Parameters**
1. **Test Device and Mode**: The permeation testing system shown in Figure 1 is capable of performing both variable head and constant head penetration tests, offering versatility in testing conditions.
2. **Additional Equipment**: Alongside the main apparatus, the setup includes measuring cylinders, stopwatches, thermometers, water-stop fillers, and heating devices. These tools help ensure precise control over the testing environment.
**IV. Test Procedure**
1. Prepare the asphalt mixture according to the specified standards (refer to the appendix) and form Marshall specimens as required. If core samples are used, cut the top and bottom surfaces flat using a core cutter, then measure the average height and diameter of the specimen.
2. Remove the upper cover of the permeation mold, place the specimen in the center, and clean its surface thoroughly to remove any oil, dust, or contaminants. Ensure that no water or asphalt seeps around the specimen. Apply hot asphalt to seal the gap between the mold and the specimen, being careful not to let the hot asphalt come into contact with the surface of the sample. Once cooled to room temperature, install the top cover and tighten the bolts securely. After installation, inspect the mold to confirm it is properly sealed and that all piping is clear.
3. Use distilled or filtered water for the test, and degas the water before starting the test using suction or boiling. Maintain the water temperature 3°C to 4°C higher than room temperature during the test. Ensure all necessary water is prepared in advance.
4. Conduct the test using the permeation device illustrated in Figure 1, following the appropriate procedure based on the selected test method. Record the time and volume of water flow accurately to calculate the permeability coefficient.
This detailed process ensures reliable and repeatable results, making the asphalt concrete permeameter an essential tool in civil engineering and pavement design.
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