A STUDY OF IMPACT VERSUS CONVENTIONAL MIXING OF ASPHALT CONCRETE AND DISCUSSION

A REINFORCED PORTLAND CEMENT CONCRETE PAVEMENT WAS SELECTED FOR RESURFACING THAT WAS IN A UNIFORM STATE OF WEAR BY TRAFFIC AND THE ELEMENTS TO MAKE A VALID COMPARISON OF THE IMPACT AND CONVENTIONAL MIXES IN SERVICE. THE TESTING PROGRAM WAS DESIGNED TO INSURE CLOSE CONTROL OF MIX VARIABLES DURING PRODUCTION AND TO PERMIT MOLDING STABILITY SPECIMENS AND EXTRACTION AND RECOVERY OF ASPHALT CEMENT DURING THE DAY IN WHICH THE MATERIAL WAS PRODUCED. APPARATUS FOR THE EXTRACTION, RECOVERY, PENETRATION AND DUCTILITY TESTS WAS INSTALLED IN A TRAILER AND MOVED TO THE PLANT SITE. RESULTS SHOW' /1/ THE TOTAL MIXING TIME USING THE IMPACT MIXING METHOD IS AN AVERAGE OF 40 TO 50 PERCENT LESS THAN FOR THE CONVENTIONAL METHOD, /2/ THE IMPACT METHOD PRODUCED A MIX HAVING GREATER WORKABILITY THAN THE CONVENTIONAL METHOD, /3/ THE LOSS OF PENETRATION OF ASPHALT USED IN MIXING BY BOTH THE IMPACT AND THE CONVENTIONAL METHODS IS APPROXIMATELY THE SAME WHEN ALL OF THE CONDITIONS OF MIXING, TRANSPORTATION, PLACING, AND FINISHING ARE THE SAME, /4/ THE LOSS IN DUCTILITY OF ASPHALT USED IN MIXING BY BOTH THE IMPACT AND THE CONVENTIONAL METHODS IS THE SAME WHEN ALL OF THE CONDITIONS OF MIXING, TRANSPORTATION, PLACING, AND FINISHING ARE THE SAME, AND /5/ IMPACT MIXING CAN RESULT IN GREATER HOURLY PRODUCTION OF ASPHALT CONCRETE PROVIDING CERTAIN PLANT COMPONENTS SUCH AS THE DRIER, SCREENS, AND BINS ARE INCREASED IN SIZE TO SUPPLY THE DRIED, HEATED, AND GRADED AGGREGATES.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1963/24/24-006.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:
  • Kimble, Fred W
• Discussers:
  • Csanyi, Ladis H
• Publication Date: 1963

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: No 24, pp 138-163, 20 FIG, 19 TAB, 13 REF
• Monograph Title: Bituminous materials and mixtures
• Serial:
  • Highway Research Record
  • Issue Number: 24
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Alternatives analysis; Asphalt concrete; Ductility; Mixing; Mixing plants; Pavements; Pendulum tests; Portland cement concrete; Production; Reinforced concrete pavements; Resurfacing; Test sections; Time; Workability
• Old TRIS Terms: Bituminous mixing plants; Existing pavements; Mixing procedures; Mixing time
• Subject Areas: Construction; Highways; Pavements;

Filing Info

• Accession Number: 00214406
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jul 8 1994 12:00AM