What is the required maximum liquid limit for Item 300?

The maximum liquid limit for Item 300 is an important specification in materials engineering, particularly when working with soils and aggregates. Item 300 typically refers to base and subbase materials for asphalt and concrete pavements. These materials must meet certain criteria to ensure stability and performance, and the liquid limit is a key factor in determining the plasticity and workability of the material.

A liquid limit of 35% indicates the maximum amount of water the material can hold without becoming too fluid, which would compromise the structural integrity. This limit helps to ensure proper load-bearing capacity while preventing issues such as excessive deformation or instability when the material is in place.

Maintaining the liquid limit at this level ensures that the material is cohesive enough to be compacted effectively, which is essential for the durability of pavement structures. This understanding also aligns with industry standards for construction materials, as they are designed to perform well under various environmental conditions and load stresses.

In summary, the correct answer reflects a critical threshold for liquid limits in engineering practices related to pavement material specifications, supporting both safety and performance in engineering design.