This report documents the fact that the Chang-Majidzadeh design criteria can be used to predict crack spacing in CRC pavement structures. The Chang-Majidzadeh model is also found to be in agreement with the NCHRP proposed design criteria. The major points of agreement are as follows: The optimum average cracking spacing in CRC pavements is 5 feet. Crack spacings smaller than 5 and greater than 8 feet are not desirable. Crack spacing is more uniform in thicker CRC pavements (9") than in thin pavements (6"). Depth of steel reinforcement has a significant influence on crack spacing. As the ratio of steel depth to pavement thickness increases, an increase in crack spacing results. That is, the placement of steel at depths above mid-depth results in closer crack spacing. The results of the analysis indicate that the location of steel reinforcement affects the crack opening. The placement of steel reinforcement below mid-depth results in excessive crack opening. This finding is in agreement with the results of field observations. Optimum crack spacing, crack opening and steel stress are greatly dependent on the environmental conditions during the curing period. Air temperature and climatic conditions such as cloud cover (radiation flux) affect the temperature distribution in the pavement concrete during the plastic and hardened states. Temperature variations during early curing periods, and the temperature differential during the service life affect the pavement performance. /FHWA/

  • Supplemental Notes:
    • Sponsored by the Ohio Department of Transportation. Prepared in cooperation with the Department of Transportation, Federal Highway Administration.
  • Corporate Authors:

    Majidzadeh (Kamran)

    1168 Circle-on-the-Green
    Worthington, OH  United States  43085
  • Authors:
    • Majidzadeh, K
  • Publication Date: 1977-6

Media Info

  • Pagination: 143 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00195595
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-79-S0849 Final Rpt., FCP 45E2-032
  • Contract Numbers: 14278(0)
  • Files: TRIS, USDOT
  • Created Date: Sep 15 1979 12:00AM