SETTING RATE OF ASPHALT CONCRETE

MIXES THAT SHOVE EXCESSIVELY UNDER STEEL WHEEL ROLLERS, DO NOT DENSIFY, OR ARE TENDER TO ANY TYPE OF DISTORTION ARE DEFINED AS 'SLOW SETTING.' AT TIMES, THESE MIXES REMAIN TENDER FOR PROLONGED PERIODS AFTER LAYDOWN. FIELD AND LABORATORY STUDIES SHOW THAT AGGREGATE GRADATION AND ANGULARITY, FILLER CONTENT, MOISTURE, AND COMPACTIVE EFFORT ARE IMPORTANT IN DETERMINING THE SETTING RATE OR TOUGHNESS OF A COMPACTED MIX. CONSTRUCTION AND MIX VARIABLES ARE EXAMINED UNDER CONTROLLED CONDITIONS TO ISOLATE THOSE FACTORS RESPONSIBLE FOR SLOW SETTING. DATA PRESENTED SHOW THAT HIGH-QUALITY, HIGH-STABILITY MIXES COMPACT BETTER WITH INCREASING COMPACTION TEMPERATURE, BUT THAT IN MORE UNSTABLE MIXES INCREASING THE TEMPERATURE RESULTS IN POORER COMPACTION. THE AUTHORS SHOW THE IMPORTANCE OF MINERAL FILLER TO BOTH PAVEMENT DENSITY AND TOUGHNESS. AN OPTIMUM FILLER-TO-ASPHALT RATIO EXISTS FOR MAXIMUM COMPACTION UNDER STEEL WHEEL ROLLERS. IN ADDITION, THE AMOUNT OF MINERAL FILLER IN A MIX WAS FOUND TO INFLUENCE THE SETTING RATE OF AN ASPHALT PAVEMENT. PAVEMENT TOUGHNESS PROVED DEPENDENT ON THE TYPE AND DEGREE OF COMPACTION. PNEUMATIC ROLLING SUBSTANTIALLY IMPROVES PAVEMENT TOUGHNESS. PAVEMENT SETTING IS SHOWN TO BE MUCH FASTER IN A MIX WITH CRUSHED, ANGULAR AGGREGATE RATHER THAN ROUNDED GRAVEL. THE SETTING RATE OF ASPHALT CONCRETE PAVEMENTS IS LARGELY CONTROLLED BY THE CONSTRUCTION PRACTICES AND MATERIAL PROPERTIES INVESTIGATED IN THIS PAPER. SUGGESTIONS ARE GIVEN ON HOW TO ACHIEVE MAXIMUM DENSIFICATION AND PAVEMENT TOUGHNESS. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrbbulletin/333/333-001.pdf
• Supplemental Notes:
  • 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:
  • Santucci, L E
  • Schmidt, R J
• Conference:
  • 41st Annual Meeting of the Highway Research Board
  • Location: Washington DC, United States
  • Date: 1962-1-8 to 1962-1-12
• Publication Date: 1962

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 1-9
• Monograph Title: Factors influencing setting and hardening of asphalt in bituminous pavements
• Serial:
  • Highway Research Board Bulletin
  • Issue Number: 333
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Aggregate gradation; Asphalt concrete; Asphalt pavements; Building materials; Compaction; Concrete curing; Construction management; Density; Fillers (Materials); Grain shape (Geology); Mineral fillers; Mixing; Moisture content; Pneumatic equipment; Rollers; Temperature; Toughness
• Old TRIS Terms: Mixing temperature; Pneumatic rollers
• Subject Areas: Construction; Highways; Materials;

Filing Info

• Accession Number: 00210833
• Record Type: Publication
• Files: TRIS, TRB, ATRI
• Created Date: Jul 29 1994 12:00AM