What is the maximum allowable relative density for cohesionless soils in asphalt paving?

The maximum allowable relative density for cohesionless soils in asphalt paving is important for ensuring stability and integrity of the pavement structure. A relative density not less than 85% strikes a balance between achieving sufficient compaction and allowing for appropriate drainage characteristics. This level of density minimizes pore spaces that can lead to instability while ensuring that the material remains workable during the paving process.

In asphalt paving, cohesionless soils, such as sand and gravel, rely on their density to provide adequate support and to prevent issues such as settling or shifting over time. The specified density criteria help mitigate the risk of performance issues that could arise from under-compacted materials, which could lead to deformation under load.

Selecting the correct range for density is critical. Densities significantly lower than 85% may result in poor load-bearing capacity, while excessive compaction beyond the necessary threshold could compromise the material's drainage and flexibility, leading to premature failure of pavement layers. Thus, maintaining a relative density of 85% or higher aligns with engineering practices aimed at optimizing both strength and durability in asphalt construction.