EXPERIMENTAL PAVED SHOULDERS ON FROST SUSCEPTIBLE SOILS

FOUR PAVED-SHOULDER TYPES WERE INCLUDED EXPERIMENTALLY IN A CONSTRUCTION PROJECT THAT ALSO INCLUDED CONTINUOUSLY REINFORCED CONCRETE PAVEMENT. THE SHOULDER TYPES WERE A BITUMINOUS-AGGREGATE MIXTURE (BAM) THAT SERVED AS BOTH BASE AND WEARING SURFACE; A CEMENT-AGGREGATE MIXTURE (CAM) AND A POZZOLAN-AGGREGATE MIXTURE (PAM) SURFACED WITH BITUMINOUS CONCRETE; AND PAVING GRADE PORTLAND CEMENT CONCRETE (PCC). THE BAM, CAM, AND PAM MIXTURES ALSO WERE USED AS PAVEMENT SUBBASE. THE CONSTRUCTION TOOK PLACE IN AN AREA OF FROST-SUSCEPTIBLE FINE-GRAINED SOILS THAT HAD BEEN ASSOCIATED PREVIOUSLY IN ILLINOIS WITH SEVERE WINTER HEAVE OF THE CAM AND PAM SHOULDER TYPES AND CONCURRENT FREEZE-THAW DISINTEGRATION AND STRUCTURAL FAILURE. DURABILITY IMPROVEMENTS WERE MADE IN THE NEW CAM AND PAM MIXTURES. THREE YEARS OF SERVICE EXPERIENCE SHOWED THAT IMPROVED CAM AND PAM MIXTURES STILL TO BE SUSCEPTIBLE TO FREEZE-THAW DAMAGE IN SHOULDER BASE CONSTRUCTION, BUT TO SERVE ADEQUATELY AS PAVEMENT SUBBASE. THE SERVICE AFFORDED BY THE BAM SHOULDER TYPE WAS DIASPPOINTING AND AT VARIANCE WITH PREVIOUS EXPERIENCE IN ILLINOIS. CONSTRUCTION ABERRATIONS ARE BELIEVED TO BE A PRINCIPAL CAUSE OF THE POOR SERVICE. THE BAM MATERIAL WAS FOUND TO SERVE ADEQUATELY AS PAVEMENT SUBBASE. THE PCC SHOULDERS WERE STILL GIVING EXCELLENT SERVICE AT THE CONCLUSION OF OBSERVATIONS. THE PRESENCE AND ABSENCE OF SHOULDER SUBBASE AND OF SEALANT IN THE PAVEMENT-SHOULDER JOINT WERE OTHER VARIABLES STUDIED. DETAILED INFORMATION USEFUL IN SELECTING SHOULDER PAVING MATERIALS AND STRUCTURAL DESIGNS IS PRESENTED. CONTRARY TO EXPERIENCE ELSEWHERE IN NORTHERN ILLINOIS, SIGNIFICANT DIFFERENTIAL VERTICAL PAVEMENT-SHOULDER MOVEMENTS DID NOT OCCUR DURING THE PERIOD OF THE STUDY. A CHANGE FROM UNSTABILIZED TO STABILIZED AGGREGATE PAVEMENT SUBBASE IS BELIEVED RESPONSIBLE FOR THE DIFFERENCE.

  • Supplemental Notes:
    • CONTACT NO: IHR-404
  • Corporate Authors:

    Illinois Department of Transportation

    2300 S. Dirksen Parkway
    Springfield, IL  United States  62764

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • McKenzie, L J
  • Publication Date: 1972-3

Media Info

  • Pagination: 79 p.
  • Serial:
    • Issue Number: 39

Subject/Index Terms

Filing Info

  • Accession Number: 00205401
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Files: TRIS, USDOT
  • Created Date: Jul 17 1973 12:00AM