For the ignition method (T308), the mass used should agree with the mass after ignition within 0.1%; if not, the results should not be used for acceptance.

• A. True
• B. It should be within 1%
• C. The mass equals the mineral matter mass
• D. It should be within 0.01%

Answer: (A)

In the ignition method, the accuracy of mass measurements is essential because you determine asphalt content by burning off the asphalt binder and weighing the remaining mineral matter. The mass used for calculating the asphalt content must agree with the mass after ignition to within 0.1% because this tight check ensures that the measured mass reflects what actually remains after ignition and that there was no excessive loss due to incomplete ignition, moisture exchange, or scale error. If the two masses differ by more than 0.1%, the result is considered unreliable for acceptance and must be redone. The other options either propose looser tolerances or mix up which mass is being compared, so they do not fit the procedure.