The performance of the original portland cement concrete pavement sections from the AASHO Test Road has been studied. Findings indicate that the original AASHO performance equation for rigid pavements predicted a greater servcie life expectation for the thicker pavement slabs than was being observed. To agree with the observed performance, a modified performance equation that slightly increased the performance expectation for the pavement sections 8.0 in. (203 mm) thick and reduced the expectation for the pavement sections 9.5 in. (241 mm), 11.0 in. (279 mm) and 12.5 in. (318 mm) thick was developed. Stabilized aggregate subbases, expecially the BAM, improved rigid pavement performance. On the BAM subbase, rigid pavement sections developed fewer major cracks, and pavements with joints spaced at 100 ft (30.5 m) had the most uniform winter joint opening. Dowel bar corrosion was the primary cause of joint lockup in the rigid pavement test sections. Stabilized aggregate mixtures, used as the base course in flexible pavements, had variable effects on pavement behavior. On the BAM base, the flexible pavements were smoothest. On the CAM base, transverse cracks formed which "tented" in freezing weather. On the granular base, area cracking was the primary form of pavement distress and the deepest ruts formed. But formation was reduced on the rigid base and the least rutting developed where asbestos fiber filler was used in lieu of part of the filler. /FHWA/

  • Supplemental Notes:
    • Study Title: IHR-28, AASHO Road Test Phase 1. This study was conducted with the Department of Transportation, Federal Highway Administration.
  • Corporate Authors:

    Illinois Department of Transportation

    Bureau of Materials and Physical Research
    126 East Ash Street
    Springfield, IL  United States  62704-4766
  • Authors:
    • Little, F J
    • McKenzie, L J
  • Publication Date: 1977-6

Media Info

  • Pagination: 99 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00188503
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-IL-PR-76 Intrm Rpt., FCP 45C3-342
  • Contract Numbers: IHR-28-Phase 1c
  • Created Date: Mar 14 1979 12:00AM