TRAFFIC SIMULATOR FOR CHECKING MIX BEHAVIOR

SOME ASPHALTIC CONCRETE MIXES DESIGNED BY ACCEPTED STABILITY PROCEDURES HAVE SHOWN SIGNS OF DISTRESS UNDER HEAVY VOLUMES AND LOADINGS OF TRAFFIC. IN AN EFFORT TO ASCERTAIN THE EFFECT OF TRAFFIC ON SPECIMENS OF KNOWN STABILITY, A LABORATORY TRAFFIC SIMULATOR WAS DESIGNED AND BUILT. THE SPECIMENS TESTED ARE THE SAME AS THOSE USED IN EITHER THE MARSHALL OR HVEEM STABILITY TESTS. THE SPECIMEN IS PLACED IN A COLLAR EQUIPPED WITH HEATING COILS AND TEMPERATURE SENSORS, WHICH IN TURN IS BOXED IN THE FRAME OF THE INSTRUMENT IN SUCH A MANNER AS TO PERMIT THE TRAFFIC SIMULATOR WHEEL TO TRAVEL OVER THE CENTER OF THE UPPER SURFACE OF THE SPECIMEN. THE TEMPERATURE OF THE SPECIMENS MAY BE MAINTAINED AT ANY DESIRED POINT, DURING TEST, BY EITHER THE HEATER COILS ON THE SPECIMEN COLLAR OR DRY ICE PACKED IN THE BOX. SIX SPECIMENS MAY BE TESTED SIMULTANEOUSLY. TESTS CONDUCTED WITH THE TRAFFIC SIMULATOR INDICATED THAT SOME MIXES WHICH MEET STABILITY CRITERIA SHOW DISTRESS UNDER THE TEST, OTHER MIXES HAVING LESSER STABILITIES SHOWED LESS DISPLACEMENT THAN SIMILAR MIXES HAVING HIGHER STABILITIES, ALSO OTHER MIXES WHICH RESIST DISPLACEMENT FOR 2,000 TO 3,000 PASSES OF THE TRAFFIC WHEEL WILL SUDDENLY SHOW DISTRESS WITH A FEW HUNDRED ADDITIONAL PASSES. THE ONLY PURPOSE OF THE TRAFFIC SIMULATOR IS TO SERVE AS A SUPPLEMENTARY CHECK ON THE BEHAVIOR OF MIXES UNDER A MOVING WHEEL LOAD. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1964/51/51-004.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:
  • Csanyi, Ladis H
  • Fung, Hon-Pong
• Publication Date: 1964

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 57-67
• Monograph Title: Bituminous concrete mixtures and construction
• Serial:
  • Highway Research Record
  • Issue Number: 51
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Admixtures; Asphalt concrete; Behavior; Design; Hveem stabilometer; Marshall test; Mix design; Motion; Moving industry; Simulation; Specimens; Stability (Mechanics); Temperature sensors; Testing equipment; Traffic; Training simulators; Wheel loads
• Uncontrolled Terms: Laboratory equipment
• Old TRIS Terms: Marshall stability marshall stability & flow test flow
• Subject Areas: Design; Freight Transportation; Geotechnology; Highways; Materials; Operations and Traffic Management;

Filing Info

• Accession Number: 00215780
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Dec 12 1994 12:00AM