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USE OF VIBRATION IN PLACING SCREENINGS IN MACADAM BASES

IN AN EFFORT TO IMPROVE THE CONSTRUCTION OF DRYBOUND AND WATERBOUND MACADAM BASES, TESTS WERE MADE USING VIBRATORY METHODS OF PLACING THE SCREENINGS. SOME LIMITED OBSERVATIONS WERE ALSO MADE ON THE ABILITY OF VIBRATORY METHODS TO KEY COARSE AGGREGATE. TWO TYPES OF MACHINES WERE USED TO PLACE THE SCREENINGS. ONE WAS ESSENTIALLY A THREE AXLE TANDEM ROLLER. THE CENTER ROLL WAS AN IDLER WHICH COULD BE VIBRATED AT THE RATE OF 3600 PULSATIONS PER MINUTE. THE OTHER CONSISTED OF A CRAWLER PROPELLED FRAME WHICH MOVED A BATTERY OF SIX VIBRATING SHOES OVER THE COURSE. THE SHOES VIBRATED AT THE RATE OF 2800 PULSATIONS PER MINUTE. THE PROJECTS USING TWO TYPES OF AGGREGATES, DIFFERENT THICKNESSES OF COURSES AND DIFFERENT RATES OF APPLICATION OF SCREENINGS ARE DESCRIBED. IT WAS DISCOVERED THAT VIBRATION WAS OF QUESTIONABLE VALUE IN THE KEYING OF THE COARSE AGGREGATE BUT REMARKABLY EFFICIENT IN THE PLACING OF THE SCREENINGS. /AUTHOR/

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  • Supplemental Notes:
    • Vol 27, pp 148-156, 15 FIG, 4 TAB. 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:
    • Allen, C W
    • Linzell, S O
  • Publication Date: 1948

Media Info

  • Media Type: Digital/other
  • Monograph Title: Proceedings of the Twenty-Seventh Annual Meeting of the Highway Research Board Held at Washington, D.C. December 2-5, 1947
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00215413
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 2 1971 12:00AM