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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

INVESTIGATIONAL CONCRETE PAVEMENT IN OREGON

THE SECTION OF PAVEMENT COVERED BY THIS REPORT WAS ONE OF SIX SECTIONS IN SIX STATES BUILT UNDER COOPERATIVE AGREEMENTS WITH THE BUREAU OF PUBLIC ROADS IN 1940 AND 1941. THE PROJECT WAS SET UP PRIMARILY TO OBSERVE THE EFFECT OF EXPANSION JOINT SPACING IN CONCRETE PAVEMENTS OVER A TEN- YEAR PERIOD. CLIMATOLOGICAL AND TRAFFIC DATA WERE RECORDED AS WELL AS DAILY, SEASONAL, AND PERMANENT CHANGES IN WIDTH AND ELEVATION. CONDITION SURVEYS FOR FAULTING, CRACKING, AND PUMPING WERE REPORTED. AS AN EXPERIMENTAL PROJECT, THE LOMBARD STREET-KILLINGSWORTH STREET SECTION WAS A DISAPPOINTMENT. THE EXCELLENT QUALITY OF THE SOIL AND THE ADEQUATE GRANULAR BASE HAVE MASKED ANY DIFFERENCES IN PERFORMANCE OF THE SEVERAL SUBSECTIONS. ALL SUBSECTIONS, REGARDLESS OF JOINT SPACING, LOAD TRANSFER OR OTHER VARIABLES, HAVE WITHSTOOD TEN YEARS OF HEAVY TRAFFIC WITHOUT NOTICEABLE DETERIORATION. EXPANSION JOINTS CAN BE ELIMINATED IN PAVEMENTS BUILT FROM SOUND MATERIALS. THERE IS NO INDICATION OF ANY KIND THAT A MILE-LONG SECTION WITHOUT EXPANSION JOINTS HAS BEEN INJURED IN ANY WAY. WHEN EXPANSION JOINTS ARE PLACED, THEY BEGIN TO CLOSE IMMEDIATELY AFTER CONSTRUCTION, AND THIS CLOSURE HAS CONTINUED AT A FAIRLY EVEN RATE FOR TEN YEARS. ALL CONTRACTION JOINTS, EVEN IN THE MILE-LONG SECTION WHERE RESTRAINT IS A MAXIMUM, HAVE OPENED ENOUGH SO THAT AGGREGATE INTERLOCK ACROSS THE JOINTS IS NOT EFFECTIVE. WITH A YIELDING BASE, SOME LOAD TRANSFER DEVICE IS PROBABLY ADVISABLE. IN THIS PARTICULAR PROJECT THE QUALITY OF THE BASE AND SUBGRADE IS SUCH THAT LOAD TRANSFER IS APPARENTLY NOT NECESSARY. EVEN THOUGH THE MEASUREMENTS SHOW THAT THE CONTRACTION JOINTS CANNOT DEVELOP AGGREGATE INTERLOCK, THERE IS NO INDICATION OF PUMPING OR FAULTING AT THE JOINTS. THE TRAFFIC VOLUME IS GREAT ENOUGH TO HAVE PRODUCED THESE EFFECTS IF THEY ARE TO OCCUR. THEIR ABSENCE IS UNDOUBTEDLY DUE TO THE EXCELLENT SUBGRADE AND THE ADEQUATE GRANULAR BASE. THE DURABILITY OF THE PAVEMENT IS EVIDENCE OF THE ADVISABILITY OF THE USE OF GRANULAR BASES WHERE SUCH USE IS ECONOMICALLY FEASIBLE. /AUTHOR/

  • Supplemental Notes:
    • Res Rept 17-B, PP 151-159, 5 FIG, 3 TAB
  • Authors:
    • Paxson, G S
  • Publication Date: 1956

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  • Accession Number: 00207431
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 22 1972 12:00AM