PREDICTING PERFORMANCE OF PAVEMENTS BY DEFLECTION MEASUREMENTS

THE TWO MAIN OBJECTIVES OF THIS STUDY ARE TO DEVELOP A MEANS FOR PREDICTING THE LIFE OF FLEXIBLE PAVEMENTS BY USE OF DEFLECTION MEASUREMENTS OF SELECTED INSERVICE PAVEMENTS, AND TO DETERMINE WHICH OF THE THREE FACTORS OF TRAFFIC, SOIL SUPPORT, OR AGE HAVE THE MOST SIGNIFICANT EFFECT ON THE DEFLECTIONS. THE METHOD OF INVESTIGATION IS CENTERED AROUND THE CELL TYPE DESIGN WHICH IS DIVIDED INTO TWO TEST PATTERNS, WHICH USE THE TERMINAL SERVICEABILITY INDEXES, OF 2.0 AND 2.5 USED IN UTAH'S PAVEMENT DESIGN. THE THREE FACTORS OF TRAFFIC, SOIL SUPPORT, AND AGE WERE EACH EVALUATED AT THREE LEVELS IN THE CELL DESIGN. THE DEFLECTION MEASUREMENTS ARE TAKEN IN THE OUTER WHEEL PATH IN BOTH THE FALL AND SPRING BY USE OF THE DYNAFLECT WHICH WAS DEVELOPED BY LANE-WELLS OF HOUSTON, TEXAS. THE HYPOTHESIS WAS FORMED THAT SPRING AND FALL DEFLECTIONS WERE THE SAME. THIS HYPOTHESIS WAS REJECTED IN BOTH TEST PATTERNS, WITH AN INCREASE OF 18.5% IN SPRING DEFLECTIONS. THE ANALYSIS OF VARIANCE SHOWED THAT TRAFFIC WAS THE ONLY ONE OF THE THREE FACTORS SIGNIFICANT AT THE 0.05 LEVEL IN AFFECTING DEFLECTIONS. /AUTHOR/

• 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
  • Nielson, G F
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Age; Analysis of variance; Deflection tests; Flexible pavements; Forecasting; Pavement design; Pavement performance; Seasons; Soils; Traffic
• Non-Preferred Terms: Serviceability
• Uncontrolled Terms: Seasonal variations; Serviceability Index
• Old TRIS Terms: Inservice
• Subject Areas: Data and Information Technology; Design; Geotechnology; Highways; Operations and Traffic Management; Pavements;

Filing Info

• Accession Number: 00206404
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Report/Paper Numbers: No 908
• Files: TRIS, STATEDOT
• Created Date: Jul 14 1970 12:00AM