AN EVALUATION OF THE CHLOE PROFILOMETER AND THE CAUSES OF PAVEMENT DEPRECIATION IN MAINE

THE CHLOE PROFILOMETER IS AN ELECTRONICALLY ORIENTED INSTRUMENT DEVELOPED AT THE AASHO ROAD TEST THAT MEASURES THE SMOOTHNESS OF A ROAD. THE PURPOSE OF THIS REPORT IS TWO- FOLD, FIRST TO EXPLAIN THE PROBLEMS THAT OCCURRED WITH A PROFILOMETER PURCHASED BY THE MAINE STATE HIGHWAY COMMISSION. IT ALSO DESCRIBES HOW THE DATA WAS OBTAINED AS WELL AS THE METHOD USED IN THE OFFICE TO PROCESS THE INFORMATION. THE MERITS AND DEMERITS OF THE EQUIPMENT AND THE METHODS USED ARE ALSO DISCUSSED. THE SECOND PART OF THE REPORT PRESENTS AN ATTEMPT USING PRESENT SERVICEABILITY INDEXES, TO DIFFERENTIATE IN TERMS OF CHLOE THE INFLUENCES CAUSED BY (1) SEASONAL VARIATIONS (FROST ACTION), (2) CLEAN AND DIRTY SUBGRADE MATERIALS, (3) PAVEMENT DEPRECIATION WITH RESPECT TO TIME, (4) PAVEMENT DEPRECIATION WITH RESPECT TO TOTAL 18 KIP EQUIVALENT AXLE APPLICATIONS. ALTHOUGH THE EFFECT OF THESE VARIABLES UPON THE RESULTS ARE NOT CLEARLY ISOLATED, THEY SHOW THAT A "DIRTY" SUBGRADE SOIL PERMITS GREATER RANGES IN SERVICEABILITY TO OCCUR THAN DO "CLEAN" SUBGRADES. THIS WIDE SERVICEABILITY RANGE ALSO APPEARS TO HAVE A DIRECT RELATIONSHIP IN CAUSING THE PAVEMENT SERVICEABILITY TO DROP WITH RESPECT TO TIME AND TRAFFIC. THESE RESULTS ALSO INDICATE THAT PAVEMENTS CONSTRUCTED ON A "CLEAN" SUBGRADE, OR A SUBGRADE THAT REMAINS IN A UNIFORM STRENGTH CONDITION THROUGHOUT THE YEAR, WILL LAST LONGER AND BE ABLE TO WITHSTAND APPROXIMATELY TWICE AS MUCH TRAFFIC (AXLE LOADS) AS A "DIRTY" SUBGRADE SUBJECTED TO SEVERE STRUCTURAL VARIATIONS CAUSED BY SEASONAL CHANGE. /AUTHOR/

• Supplemental Notes:
  • Study No 430, BPR NO 004848353
• Corporate Authors:

  Maine State Highway Commission

  Materials and Research Division, Bureau of Highways
  Augusta, ME  United States  04330

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Mcnaughton, E L
  • Rand, D W
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Durability; Evaluation; Frost action; Loads; Pavement performance; Pavements; Profilometers; Serviceability; Subgrade materials
• Uncontrolled Terms: Loading
• Subject Areas: Design; Highways; Pavements;

Filing Info

• Accession Number: 00206474
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Files: TRIS, USDOT
• Created Date: Mar 27 1972 12:00AM