COLD-WEATHER PAVING OF THIN LIFTS OF HOT-MIXED ASPHALT ON PREHEATED ASPHALT BASE

BASE PREHEAT IS THE APPLICATION OF THERMAL ENERGY TO THE BASE PRIOR TO THE PLACEMENT AND COMPACTION OF HOT-MIXED ASPHALT PAVEMENTS. THE GREATEST POTENTIAL USE OF BASE PREHEAT IS IN THE PLACEMENT OF HOT-MIXED SEAL COATS OR THIN WEARING SURFACES ON EXISTING ASPHALT PAVEMENTS OR ASPHALT BASES IN THE EARLY SPRING OR IN THE FALL. BENCH SCALE LABORATORY TESTS WERE CONDUCTED IN WHICH TEST SPECIMENS HAVING 4-IN. DIAMETER ASPHALT BASES WERE PREHEATED WITH A DIRECT-FIRED PROPANE HEATER. INITIAL BASE TEMPERATURES RANGED FROM 20 TO 50 F. THE COMPUTER PROGRAM THAT WAS DEVELOPED AND TESTED EXPERIMENTALLY FOR BASE PREHEAT WAS COMBINED WITH A COMPUTER PROGRAM FOR COOLING OF HOT-MIXED ASPHALT PAVEMENTS AFTER PLACEMENT; THUS, IT WAS POSSIBLE TO SIMULATE COLD-WEATHER PAVING OPERATIONS INVOLVING THE PLACEMENT OF THIN MATS ON PREHEATED ASPHALT BASES. THE PREHEAT TIMES REQUIRED ARE SHOWN TO BE A FUNCTION OF HEATER RELEASE RATE AND INITIAL BASE TEMPERATURE IN ADDITION TO THE VARIABLES GOVERNING THE COOLING OF THE MAT. REQUIRED PREHEAT TIMES APPEAR TO BE IN CONSONANCE WITH THE LOGISTICS OF THE PLACEMENT OF THIN LIFTS OF HOT-MIXED ASPHALT SURFACING. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1972/385/385-001.pdf
• Supplemental Notes:
  • Sponsored by Committee on Flexible Pavement Design. 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:
  • Corlew, J S
  • Dickson, Philip F
• Conference:
  • 51st Annual Meeting of the Highway Research Board
  • Location: Washington District of Columbia, United States
  • Date: 1972-1-17 to 1972-1-21
• Publication Date: 1972

Media Info

• Media Type: Digital/other
• Features: Figures; References;
• Pagination: pp 1-6
• Monograph Title: Bituminous construction and quality control
• Serial:
  • Highway Research Record
  • Issue Number: 385
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Asphalt pavements; Base course (Pavements); Cold weather; Hot mix asphalt; Laboratory tests; Operations; Pavements; Preheating; Seal coats; Simulation; Temperature; Thermal conductivity; Wearing course (Pavements)
• Uncontrolled Terms: Temperature distribution
• Old TRIS Terms: Existing pavements
• Subject Areas: Administration and Management; Construction; Highways; Pavements;

Filing Info

• Accession Number: 00215553
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Sep 30 1972 12:00AM