EVALUATION OF PAVEMENT SERVICEABILITY ON UTAH HIGHWAYS, INTERIM REPORT 1969

THIS PUBLICATION IS THE FIFTH INTERIM REPORT OF A CONTINOUS PAVEMENT PERFORMANCE STUDY. PRESENT SERVICEABILITY INDEXES WERE DETERMINED FOR A 121 HIGHWAY PROJECTS CONSTRUCTED SINCE 1962. THE (PSI) IS A NUMERICAL RATING FROM 0-5; THE HIGHER VALUES CORRESPOND TO THE BEST PAVEMENTS. THE (PSI) DEFINES THE RELATIONSHIP BETWEEN A KNOWN NUMBER OF SPECIFIC AXLE LOADS AND THE ACTUAL PERFORMANCE FOR VARIOUS PAVEMENT DESIGNS. THE PAVEMENT CRITERIA FOR THIS EVALUATION 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 SMOOTHING IS ACCEPTED AS A NATURAL RESULT FOR PAVEMENT WEAR AS EVIDENCED BY THIS RESEARCH AND COMMUNICATIONS WITH AGENCIES SPONSORING SIMILAR STUDIES. HOWEVER, THE CURRENT RESULTS SHOW A PREDOMINATE DESCENDING TREND FOR THE MAJORITY OF THE PROJECTS, THIS DECLINE IS EXPECTED. IT IS ANTICIPATED THAT PERPETUATING THIS RESEARCH WILL DEVELOP SIGNIFICANT SERVICEABILITY TRENDS THAT WILL BE VALID INDICATORS FOR DETERMINING DESIGN ADEQUACY. /BPR/

• Supplemental Notes:
  • 912, Bpr 5
• Corporate Authors:

  Utah State Department Highways

  /Materials and Test Division
  ,   United States 

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590
• Authors:
  • Liddle, W J
  • JONES, G M
  • Peterson, D E
  • Muir, D C
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Axle load force; Evaluation; Graphics; Highways; Pavement design; Pavement performance; Riding qualities; Serviceability
• Uncontrolled Terms: Graphical analysis; Serviceability Index
• Subject Areas: Design; Highways; Pavements;

Filing Info

• Accession Number: 00206396
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS, STATEDOT
• Created Date: Apr 20 1970 12:00AM