Data from the AASHO Road Test were used to investigate a functional relationship between the cumulative deflections sustained by a rigid pavement and a quantitative measure of the corresponding condition of the pavement. Cumulative deflections were estimated from periodic Benkelman beam deflections. Deflections had been measured at approximate 2-week intervals during the road test, and we assumed in the analysis that such deflections were representative of those that would have been measured had Benkelman beam deflections been measured continually. The present serviceability index (PSI) was used as a quantitative measure of pavement condition. Because of wide variation in response to loading of similarly constructed test sections and even between replicate test sections, no definitive relationship could be established that could predict PSI as a function of cumulative deflection. However, when data from test sections having the same slab thickness were averaged, a PSI-cumulative deflection relationship could be described by two straight lines intersecting at a threshold cumulative deflection. For cumulative deflections less than the threshold, an increase in cumulative deflecton produced small changes in PSI; for cumulative deflection larger than the threshold, relatively small increases in cumulative deflection produced large changes in PSI. The level of the threshold cumulative deflection increased with increasing slab thickness. /Author/

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: pp 40-45
  • Monograph Title: Pavement surface properties and performance
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00173179
  • Record Type: Publication
  • ISBN: 0309026598
  • Report/Paper Numbers: HS-022 762
  • Files: TRIS, TRB
  • Created Date: May 3 2000 12:00AM