Which of the following percentages is required for the S4.75A mix compaction?

The required percentage for the S4.75A mix compaction is typically set at 85.0 percent. This specific compaction percentage reflects the necessary density and stability for this type of asphalt mix, ensuring it achieves the desired performance characteristics, such as durability and resistance to deformation under traffic loads.

In the context of roadway construction and quality management systems (QMS), achieving the appropriate compaction level is crucial for minimizing voids within the asphalt, providing a solid foundation that can withstand environmental and traffic stresses. The adherence to this percentage is part of the standards and specifications that guide construction practices, helping to ensure consistent quality in the final roadway material.

Higher percentages in the choices, such as 90.0 percent, 92.0 percent, and 100.0 percent, may lead to unnecessary compaction that could negatively affect the mix properties, potentially causing issues like cracking or reduced flexibility, which are not ideal for the intended performance of the roadway.