SERVICE BEHAVIOR OF ASPHALTIC CONCRETE

ONE HUNDRED NINETY-FIVE PAVING PROJECTS COVERING 872 MILES AND REPRESENTING 3,000,000 TONS OF ASPHALTIC PAVEMENT, WHICH HAVE BEEN IN SERVICE FROM ONE TO 11 YEARS, WERE SURVEYED. THE DATA OBTAINED FROM THE SURVEY, TOGETHER WITH THE RESULTS OF ROUTINE TESTS MADE AT THE TIME OF CONSTRUCTION PROVIDE COMPARATIVE INFORMATION SHOWING THE EFFECT OF AGE AND TRAFFIC. THE SURVEY CONSISTED OF ESTIMATING THE DEGREE OF CRACKING, RAVELING, SHOVING AND FLUSHING. FIELD MEASUREMENTS OF WHEEL TRACK DEPRESSION AND PAVEMENT THICKNESSES WERE MADE. CORE SAMPLES WERE CUT FROM THE AREA BETWEEN WHEEL TRACKS, IN THE WHEEL TRACK AND OUTSIDE THE WHEEL TRACK. AN 8-BY 12-IN. SAMPLE WAS CUT FROM THE SHOULDER OR AREA OUTSIDE THE WHEEL TRACK. ON ARRIVAL AT THE LABORATORY THE CORE SAMPLES WERE TESTED FOR SPECIFIC GRAVITY AND STABILITY AS RECEIVED, WHICH INDICATED THE IN- PLACE CONDITION. THE CORES WERE THEN COMPACTED AND TESTED. FROM THE ANALYSIS OF THE SURFACE CONDITIONS IT WAS FOUND THAT CRACKING AND RAVELING IS AS PREVALENT AS FLUSHING IN THE PAVEMENTS SURVEYED. ANALYSIS OF THE MIXTURE BEFORE AND AFTER TRAFFIC SHOWED A LOSS OF ASPHALT CONTENT AFTER PLACING IN THE ROAD. IT WAS FOUND THAT THE DENSITY INCREASED RAPIDLY FOR THE FIRST 3 YEARS AFTER CONSTRUCTION, THEN MORE GRADUALLY FOR THE NEXT 8 YEARS. THE GREATER THE PRIOR ROLLING OR TRAFFIC, THE GREATER WILL BE THE LABORATORY- COMPACTED DENSITY. FROM STABILITY TESTS ON THE CORES, IT WAS FOUND THAT LOW IN-PALCE VALUES ARE NOT INDICATIVE OF PAVEMENT INSTABILITY, PARTICULARLY WHEN THE MIX DESIGN IS SUCH THAT FURTHER CONSOLIDATION BY TRAFFIC INCREASES THE MEASURED STABILITY VALUE. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrbbulletin/300/300-002.pdf
• Supplemental Notes:
  • No 300, pp 18-31, 4 FIG, 6 TAB, 2 APP Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • White, Oscar A
• Conference:
  • 40th Annual Meeting of the Highway Research Board
  • Location: Washington DC, United States
  • Date: 1961-1-9 to 1961-1-13
• Publication Date: 1961

Media Info

• Media Type: Digital/other
• Monograph Title: Materials for asphaltic concrete
• Serial:
  • Highway Research Board Bulletin
  • Issue Number: 300
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Age; Alternatives analysis; Asphalt concrete; Asphalt pavements; Core samples; Density; Depressed highways; Durability; Flushing; Fracture mechanics; Pavements; Plastic deformation; Railroad tracks; Road shoulders; Stability (Mechanics); Stripping (Pavements); Thickness; Wheels
• Uncontrolled Terms: Comparative analysis; Pavement thickness
• Old TRIS Terms: Core density
• Subject Areas: Highways; Maintenance and Preservation; Pavements; Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00206917
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Aug 12 1994 12:00AM