PAVEMENT STUDY-PROJECT I 092-2 /4/

FIVE CONCRETE TEST SECTIONS OF VARIOUS DESIGNS WERE CONSTRUCTED IN THE SOUTHBOUND ROADWAY OF THE DENVER-CASTLE ROCK PORT OF INTERSTATE 25 IN COLORADO TO DEVELOP INFORMATION ON THE BEHAVIOR AND REQUIREMENTS OF RIGID PAVEMENTS CONSTRUCTED ON SWELLING SOILS. ALL TEST SECTIONS WERE 1/2 MILE LONG, EXCEPT THE CONTROL SECTION WHICH WAS ONE MILE LONG. GRADING SPECIFICATIONS REQUIRED 95% STANDARD T-99 AASHO COMPACTION, AND AN ATTEMPT WAS MADE TO COMPACT THE SOIL AS MUCH ON THE WET SIDE OF OPTIMUM MOISTURE AS FEASIBLE. BASED ON EIGHT YEARS OF PAVEMENT PERFORMANCE, THE FOLLOWING CONCLUSIONS WERE DRAWN: (1) A-6 AND A-7 SOILS HAVE THE CAPABILITY OF LARGE VOLUME CHANGE AND SHOULD BE CONSIDERED AS SWELLING SOILS, (2) STANDARD AASHO T-99 COMPACTION IS NECESSARY IN AT LEAST THE TOP 4 FEET OF FILLS AND IN SUBEXCAVATED AND BACKFILLED CUTS, (3) NONE OF THE TEST SECTIONS EXPERIENCED MUCH CHANGE IN ROUGHNESS DURING THE EIGHT YEAR PERIOD, AND (4) BASED ON PERFORMANCE TO DATE, THE EXTRA COST OF THE REINFORCEMENT IS NOT JUSTIFIED WHEN THE SUBGRADE SOIL SWELL IS LESS THAN 3% AND THE SUBGRADE HAS UNIFORM AASHO T-99 MOISTURE CONTENT AND DENSITY.

  • Supplemental Notes:
    • Hpr-1/3/, STATE 1475, BPR 8
  • Corporate Authors:

    Colorado Department of Highways

    4201 East Arkansas Avenue
    Denver, CO  USA  80222
  • Publication Date: 1966

Subject/Index Terms

Filing Info

  • Accession Number: 00206279
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Oct 1 1994 12:00AM