If the test is run immediately following the test procedures for T164 or T308, the extracted aggregate must still be dried to a constant mass in an oven.

• A. True
• B. Only for large samples
• C. Only for chemical method
• D. False

Answer: (D)

The key idea is that when you determine asphalt content by solvent extraction, the mass you weigh for the dry aggregate must come from the procedure’s defined drying steps, not from an extra, separate oven-drying after finishing the extraction. The test methods T164 and T308 specify the sequence and conditions for drying and weighing the residue, including when solvent has been evaporated and the material has reached a stable mass. If you run the test immediately after those procedures, performing an additional oven-drying to constant mass is not required and could over-dry the material, introducing error in the calculated asphalt content. So the statement is not correct because the procedures themselves determine the appropriate drying/weighing point, and extra oven-drying after completing them is not mandated.