While weighing the material, if the sample has cooled more than 25 °C ( 77 °F ) below the test temperature, run the test for 70 ± 5 minutes.

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

Answer: (C)

When weighing material, how the temperature of the sample influences the test outcome is important. If the sample has cooled more than 25 °C below the test temperature, extending the test to 70 ± 5 minutes ensures the material reaches enough workability and behaves consistently for an accurate measurement. Temperature affects viscosity and flow; cooler material slows down settling or compaction, so a longer test time helps achieve a representative result within a standardized window. The 25 °C threshold marks a noticeable change in behavior, and the 70 ± 5 minutes provides a standardized duration to account for that change. So, this rule is applied to maintain reliability; if the temperature difference isn’t that large, you would follow the normal procedure timing.