What must be done to the sample if Method B or C is used?

In the context of aggregate testing, particularly when utilizing Method B or C, it is crucial to ensure the sample achieves the appropriate moisture content for accurate results. Moistening the sample helps in replicating the conditions under which the aggregate will be used in actual construction applications. This is vital because if the sample is too dry, the test results may inaccurately reflect the moisture conditions in the field, leading to potential failures in compaction, strength, or durability of the aggregate base.

Additionally, moisture can help with the proper performance of subsequent testing procedures, including compaction and density assessments, which are dependant on the right moisture levels to ensure that the sample behaves similarly to how it would in practical scenarios. Thus, ensuring adequate moisture in the sample is essential for obtaining reliable and valid results in aggregate testing.