What is the minimum required mass for a field sample for Method A and B in Standard/Modified Proctors?

For both Method A and Method B in Standard and Modified Proctor testing, the minimum required mass for a field sample plays a crucial role in ensuring that the material's moisture-density relationship is accurately determined. The requirement for 16 kg dry and 23 kg moist reflects the need for a sufficiently large sample to account for variability in the soil and to achieve reliable test results. A larger sample size helps ensure that the results represent the entire lot being tested, which is important for quality control in construction projects.

In these methods, larger samples are advantageous because they allow for more thorough compaction and mixing, which helps produce a more accurate moisture-density curve. When performing these tests, consistency in results is vital for effective soil compaction and ensuring that the soil meets the specifications set for construction projects.

The other options do not meet the requirements established in standard testing procedures, as they either provide inadequate sample sizes for accurate testing or exceed typical practices, which may lead to unnecessary material use or complications. Hence, the specified requirements are essential for obtaining valid test outcomes in soil compaction assessments.