Application of Superpave Gyratory Compactors for Flexible Base and Subgrade

The impact hammer compaction has historically been used to develop moisture-density curves and fabricate specimens for strength testing for flexible base and subgrade materials. However, the precision of compressive strength results by the impact hammer compaction remains a concern that can result in conflicting test results on whether a material meets specification requirements. This project used the Superpave Gyratory Compactor (SGC) to analyze if SGC compaction enables improved precision of compressive strength tests for flexible base and subgrade materials and analyzed a procedure for determining the moisture-density curve of base and subgrade materials using the SGC. Also, the applicability of SGC for base materials was evaluated in context of mechanistic-empirical (M-E) pavement design methods. The results showed that SGC compaction produced compressive strength results with less variability and improved precision compared to impact hammer compaction. Also, from the measurement of M-E properties, base materials compacted with the SGC were associated with lower permanent strain and higher resilient modulus than the materials with the impact hammer. The evaluation of internal structure using X-ray Compute Tomography and Aggregate Image Measurement System helped explain the behavior of materials compacted with both impact hammer and SGC compaction methods.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Technical Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 76p

Subject/Index Terms

Filing Info

  • Accession Number: 01692005
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/TX-17/0-6883-R1, 0-6883-R1
  • Contract Numbers: 06883
  • Files: TRIS, ATRI, USDOT, STATEDOT
  • Created Date: Jan 28 2019 8:07AM