When using Method A, the thickness of the specimens should be measured to the nearest 1/16 in. or 0.1 cm.

• A. Not specified
• B. True
• C. False
• D. Unknown

Answer: (B)

Precise thickness measurement directly affects the accuracy of density and air-void calculations, since the specimen’s volume depends on its thickness. In Method A, the standard requires recording thickness to the nearest 1/16 inch (0.0625 in) or 0.1 cm (1 mm) to ensure consistent, repeatable results across tests and labs. This resolution matches the typical accuracy of lab calipers and keeps potential rounding errors from skewing density measurements. If thickness were recorded with coarser precision, small variations could lead to noticeable changes in computed density and air-void content, reducing comparability and reliability. Therefore, the statement is correct: thickness should be measured to the nearest 1/16 in or 0.1 cm.