If a sample has cooled more than 25°C below the test temperature, the test duration should be 70 ± 5 minutes.

• A. False
• B. Not Applicable
• C. Cannot Determine
• D. True

Answer: (D)

In asphalt testing, the timing of a test must reflect how long it takes for the specimen to reach and stay at the prescribed test temperature so its behavior during the test is representative. When a sample is more than 25°C cooler than the target test temperature, its viscosity and response to the test conditions change more slowly. Extending the test duration to 70 ± 5 minutes provides the necessary time for the sample to thermally equilibrate and for the test to capture accurate performance at the intended temperature. The ±5 minutes portion accommodates small differences in heating efficiency and material variability, ensuring consistency across tests.