EVALUATION OF PAVEMENT SERVICEABILITY ON UTAH HIGHWAYS

THIS PUBLICATION IS THE FIFTH INTERIM REPORT OF A CONTINU- OUS PAVEMENT PERFORMANCE STUDY. PRESENT SERVICEABILITY INDEXES WERE DETERMINED FOR 121 HIGHWAY PROJECTS CONSTRUCT- ED SINCE 1962. THE PSI IS A NUMERICAL RATING FROM 0-5; THE HIGHER VALUES CORRESPOND TO THE BEST PAVEMENTS. THE CPSI DEFINES THE RELATIONSHIP BETWEEN A KNOWN NUMBER OF SPECIFIC AXLE LOADS AND THE ACTUAL PERFORMANCE FOR VARIOUS PAVEMENT DESIGNS. THE PAVEMENT CRITERIA FOR THIS EVALUA- TION ARE THE ROUGHNESS INDEX (RI) WHICH IS ROUGHNESS AS INCHES PER MILE OBTAINED BY PROFILOGRAPH TESTING, CRACKING AND PATCHING FROM VISUAL OBSERVATIONS, AND RUT DEPTHS MEASURED WITH A SPECIALLY DESIGNED RUT DEPTH GAUGE. THE PRECEDING PRESENT SERVICEABILITY INDEXES AND THE CURRENT PSI AND ALL SUBSEQUENT GRAPHICAL PLOTS FOR THE PSI WILL DEVELOP A CURVE REPRESENTING PAVEMENT PERFORMANCE. THE TREND FOR THIS CURVE IS CONSIDERED TO BE AN INDICATOR FOR DESIGN ADEQUACY OR INADEQUACY. ONCE THE SERVICEABILITY TREND IS ESTABLISHED THE DESIGN ADEQUACY CAN BE PREDICTED IN ADVANCE BY PROJECTING THE TREND TO THE INTERSECTION POINT WITH THE TERMINAL LIFE LINE. THE PRECEDING EVALUATION RESULTED IN A SIGNIFICANT AMOUNT OF PROJECTS EXHIBITING A DECREASE IN ROUGHNESS AND CORRESPONDING INCREASE IN THE PSI RATING. THIS TEMPORARY SOOTHING IS ACCEPTED AS A NATURAL RESULT FOR PAVEMENT WEAR AS EVIDENCED BY THIS RESEACH AND COMMUNICATIONS WITH AGENCIES SPONSORING SIMILAR STUDIES. HOWEVER, THE CURRENT RESULTS SHOW PREDOMINATE DESCENDING TREND FOR THE MAJORITY OF THE PROJECTS, THIS DECLINE IS EXPECTED TO CONTINUE. /AUTHOR/

  • Supplemental Notes:
    • 300 Pp, 5 FIG, 2 TAB, 4 REF, 3 APP
  • Corporate Authors:

    Utah State Department Highways

    /Materials and Test Division
    ,   USA 
  • Authors:
    • Liddle, W J
    • JONES, G M
    • Peterson, D E
    • Muir, D C
  • Publication Date: 1969

Subject/Index Terms

Filing Info

  • Accession Number: 00207088
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Aug 3 1970 12:00AM