For an aggregate sample with a maximum size of 3/4 in., what is the minimum size required for the moisture content sample?

• A. 5.5 LBS
• B. 8.0 LBS
• C. 6.6 LBS
• D. 10.0 LBS

Answer: (C)

The minimum size required for the moisture content sample in aggregate testing is determined based on the maximum size of the aggregate. When dealing with aggregate samples that have a maximum size of 3/4 inch, the guidelines typically suggest a proportional weight that ensures a sufficient sample for accurate moisture content determination.

A sample weight of 6.6 pounds is considered appropriate because it provides enough mass to allow for reliable moisture measurement while being practical to handle in a laboratory environment. Moisture content determination requires that the sample be large enough to overcome potential variability in smaller samples, ensuring that the results are representative of the bulk material.

In contrast, options that suggest weights above or below this figure may not meet the typical standards for accuracy and representation. A larger sample could lead to unnecessary resource usage, while a smaller sample may increase the risk of not obtaining an accurate moisture content reading for the aggregate being tested. Thus, 6.6 pounds stands as the optimal choice for a maximum aggregate size of 3/4 inch in this context.