What is the maximum tolerance for the surface of the completed base for crushed stone bases and sub-bases?

The maximum tolerance for the surface of the completed base for crushed stone bases and sub-bases is set at 6mm deviation. This standard is crucial in ensuring that the surface is adequately prepared for subsequent layers, such as asphalt or concrete. Maintaining a precise tolerance helps in achieving a smooth, level, and properly aligned surface, which is essential for the stability and longevity of the overall pavement structure.

Deviations beyond this specified limit can lead to various issues, including water pooling, uneven load distribution, and increased wear and tear on vehicles, ultimately compromising the integrity of the roadway. The 6mm tolerance reflects an industry consensus on balancing performance and practical constructability, ensuring that the pavement can withstand the stresses of both environmental conditions and traffic loads effectively.