What is the CBR requirement for Item 201?

The CBR, or California Bearing Ratio, is a measure of the strength of subgrade soil and is used to evaluate the ability of the soil to support loads from roadways and pavements. For Item 201, which typically refers to a specific type of material used in highway construction, the CBR requirement is set at a maximum of 80%. This standard ensures that the material has sufficient strength and stability to support traffic loads and prevent issues such as pavement deformation or failure.

An 80% maximum requirement indicates that the material must perform adequately under loading conditions typical for its intended use in road construction, ensuring safety and longevity of the pavement. Other options provided are not aligned with the established requirements in materials engineering practices, where a maximum of 70%, 90%, or 100% would not meet the standards typically required for this type of material. The 80% benchmark represents a balance between structural integrity and material availability, making it a widely recognized standard in engineering specifications for construction projects.