Skymaster Subgrade Evaluation and Compaction Feasibility

Summary (Newest Update)

Background The Air Force at Travis AFB, California, has a requirement to evaluate the existing subgrade soil on Skymaster Drive. The goal is to verify that the subgrade can achieve 95% compaction and to provide written recommendations regarding its suitability and any need for stabilization. The existing roadway section consists of approximately 6 inches of asphalt concrete (AC), which will be removed along with the underlying aggregate base (AB) to a total depth of 18 inches for reconstruction. Work Details The contractor shall obtain a representative sample of the existing subgrade soil and perform all necessary testing in accordance with applicable codes and standards to confirm that the subgrade can achieve 95% compaction. The work includes determining whether the in-place subgrade soil has sufficient strength and stability to support the new pavement structure, can achieve 95% compaction without requiring lime treatment or other stabilization, does not require additional geotechnical remediation, and meets project specifications for moisture, density, and classification. All findings must be documented in written recommendations regarding subgrade suitability and any need for stabilization, which will be submitted to the base for review. Place of Performance Travis AFB, California