Infrared thermometers - Huaqiang Electronic Network

**Application Range of Infrared Thermometer** 1. This method is suitable for preparing asphalt mixture test pieces using either the standard compaction method or the large compaction method, and it is used to evaluate the physical and mechanical properties of asphalt mixtures in a laboratory setting. 2. The standard compaction method is commonly used for tests such as the Marshall test and indirect tensile test (split method), where cylindrical specimens with dimensions of Φ101.6mm × 63.5mm are molded. On the other hand, the large compaction method is applied for larger cylindrical specimens with dimensions of Φ152.4mm × 95.3mm. 3. The specifications of mineral materials and the number of test pieces must follow certain requirements: 3.1 When designing the mix ratio of asphalt mixtures or preparing them manually in the lab, the size of the test piece should have a diameter not less than the nominal maximum particle size of the aggregate. The thickness should be at least 1–1.5 times the nominal maximum particle size. For a test piece with a diameter of 101.6mm, the nominal maximum particle size of the aggregate should not exceed 26.5mm. For coarse-grained asphalt mixtures with particles larger than 26.5mm, an equal amount of 13.2–26.5mm aggregates can be used as a replacement. Alternatively, larger cylindrical specimens with a diameter of Φ152.4mm may also be used. Large cylindrical specimens are appropriate for aggregates with a nominal maximum particle size up to 37.5mm. In the lab, the number of test pieces should generally be less than 4, but it can be increased to 5–6 if necessary. 3.2 When collecting finished asphalt mixtures from a mixing plant or construction site, and preparing test pieces with a diameter of 101.6mm, the sampling method and number of test pieces should be selected based on the following rules: - If the nominal maximum particle size of the aggregate is ≤26.5mm, direct sampling (direct method) is possible, and usually 4 test pieces are prepared. - If the nominal maximum particle size is >26.5mm but ≤31.5mm, the material should be sieved using the screening method. Still, 4 test pieces are typically prepared. However, if the direct method is used, the number should be increased to 6. - If the nominal maximum particle size is >31.5mm, the sieving method must be used, with a sieve hole size of 26.5mm. Again, 4 test pieces are prepared per set. **Instruments and Materials** - **Standard Compactor**: Includes a hammer, a flat circular compaction head with a diameter of Φ98.5mm, and a guide bar with a handle. The hammer is lifted manually or mechanically and falls freely from a height of 457.2mm ± 1.5mm. The standard compaction hammer weighs 4536g ± 9g. - **Large-Scale Compactor**: Consists of a compaction hammer, a flat round compaction head with a diameter of Φ149.5mm, and a guide bar with a handle (diameter 15.9mm). It is operated mechanically, falling freely from a height of 457.2mm ± 2.5mm. The mass of the large compaction hammer is 10210g ± 10g. - **Standard Compaction Table**: Used to fix the test setup. It includes a wooden pier (305mm × 305mm × 25mm steel plate) and is fixed on a concrete slab below. The wooden pier is made of hardwood like Cyclobalanopsis glauca or pine with a dry density between 0.67g/cm³ and 0.77g/cm³. It supports both manual and mechanical compaction. - **Automatic Compactor**: Integrates the standard compaction hammer and table, driven electrically to compact test pieces continuously and count the compaction cycles automatically. The compaction speed is 60 cycles/min ± 5 cycles/min. The power for large-scale compaction should be at least 250W. - **Laboratory Asphalt Mixer**: Ensures proper mixing temperature and time, with a capacity of at least 10L. The stirrer rotates at 70–80 r/min, while the mixing speed is 40–50 r/min. - **Mold Release Device**: Can be electric or manual, allowing for smooth removal of cylindrical test pieces. Standard and large cylindrical molds are available. - **Test Mold and Sleeve**: Made of high carbon steel or tool steel. Each set includes a cylindrical metal cylinder (inner diameter 101.6mm ± 0.2mm, height 87mm), a base (diameter ~120.6mm), and a sleeve (inner diameter 101.6mm, height 70mm). - **Large Cylindrical Test Die and Sleeve**: As shown in Figure 2, the outer diameter of the sleeve is 165.1mm, inner diameter is 155.6mm ± 0.3mm, total height 83mm. The test die has a diameter of 152.4mm ± 0.2mm, total height 115mm, base plate thickness 12.7mm, and diameter 172mm. - **Oven**: One large and one medium oven, each equipped with a temperature regulator. - **Balance or Electronic Scale**: Used to weigh mineral materials with a sensitivity of no more than 0.5g, and asphalt with a sensitivity of no more than 0.1g. - **Asphalt Kinematic Viscosity Measuring Equipment**: Includes capillary viscometers, Saybolt heavy oil viscometers, or Brookfield viscometers. - **Tools**: A knife or a large screwdriver is required for sample preparation and handling.

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