Should samples be dried to a constant mass unless rapid test results are required for coarse aggregates?

• A. True
• B. False
• C. Not specified
• D. Only for fine aggregates

Answer: (A)

Moisture in the sample will make the weight unreliable, so you dry the aggregate until its mass stops changing to get a true dry-mass basis. This constant-mass condition is what allows test results that depend on weight—like specific gravity, absorption, and asphalt-content calculations—to be accurate and comparable. The statement recognizes the standard practice and notes an exception: if a rapid result is needed for coarse aggregates, you may skip waiting for full drying. Outside that speed-related exception, drying to constant mass is the proper approach.