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Basic Introduction to the Asphalt Extensometer
2022-01-23
Introduction to the Asphalt Extensometer:
Used for measuring plastic deformation of specimens at the moment of fracture, as well as elongation tests on materials such as modified asphalt.
Main features of the asphalt ductility tester:
1. The entire machine is made of stainless steel and will never rust.
2. High-precision temperature control instrument with accurate temperature regulation.
3. It uses a copper rack, so there’s no risk of teeth jumping.
Asphalt Extensibility Tester Instruments and Data
1. Mold for Testing: Use the mold employed in the ductility test, but replace the middle section with a straight-sided mold. The cross-sectional area of the fabricated specimen shall be 1 cm².
2. Water Bath: The water bath shall maintain a stable experimental temperature with fluctuations not exceeding 0.1℃. The water bath’s volume shall be no less than 10 L, and its height must ensure that the specimen is immersed to a depth of at least 10 cm, while remaining at least 5 cm above the bottom of the water bath.
3. Ductility Testing Machine: Same as Procedure T 0605 in this specification.
4. Thermometer: Meets the requirements of the elongation test.
5. Scissors.
Method for Verification of Asphalt Extensometer
1. Adjust the zero point, power on and move the device, then simultaneously start the stopwatch. When the time reaches 1 minute, read and record the displacement interval indicated on the scale. Repeat the measurement three times and calculate the arithmetic mean, ensuring that the moving speed is within the range of (50 ± 5.0) mm/min.
2. Using a dial caliper, measure three 300-mm segments on the scale. Each measurement must not deviate by more than 1 mm to be considered qualified.
3. Use a dial caliper to measure the inner dimensions of the test mold three times each, and take the average value. The measurement is considered qualified as long as it falls within the allowable deviation range.
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