True or False: AASHTO T99 Method B requires material passing the 4.75 mm sieve.

The correct answer is true because AASHTO T99 Method B specifically pertains to the determination of the maximum dry density and optimum moisture content of soil and aggregate mixtures using a compactive effort that resembles that performed in field conditions. This test method mandates that the material being tested must pass through a 4.75 mm sieve.

This requirement is crucial as it ensures that the aggregate particles are small enough to accurately measure their compaction characteristics and provide reliable data for the evaluation of the material's performance in the field. By using material that passes this sieve, the test can better simulate the behavior of finer aggregates and soils in a compacted state, allowing for more accurate assessments of their properties.