REQUIRED THICKNESS OF ASPHALT PAVEMENT IN RELATION TO SUBGRADE SUPPORT

OBSERVATION OF THE MECHANISM OF FAILURE OF ASPHALT PAVEMENTS RESTING UPON SOIL MASSES BY MEANS OF THE TESTS DESCRIBED IN THE PAPER INDICATED THAT FAILURE OF THE ASPHALT PAVEMENT UNDER CONCENTRATED LOADING IS DIRECTLY DEPENDENT UPON THE DEFLECTION PRODUCED IN THE PAVEMENT SECTION AND NOT UPON THE MAXIMUM LOAD SUPPORTING VALUE OF THE SOIL UPON WHICH IT RESTS. THE CRITICAL DEFLECTION APPEARED TO BE BETWEEN 0.5 AND 0.6 IN., IRRESPECTIVE OF THICKNESS OF THE PAVEMENT OR DIAMETER OF THE LOADED AREA. WITH THE AVAILABLE APPARATUS, THE AUTHORS FOUND THAT PLASTIC OR COHESIVE SOILS, SUBJECTED TO CONCENTRATED LOADS OVER BEARING AREAS NOT EXCEEDING 58 SQ. IN., CONFORMED WITH THE BEHAVIOR OF COHESIVE SOILS AS OBSERVED BY HOUSEL IN A SERIES OF FIELD TESTS, WHERE FOR ANY GIVEN DEFLECTION A STRAIGHT LINE RELATION EXISTED BETWEEN THE UNIT LOAD AND THE PERIMETER- AREA RATIO OF DIFFERENT BEARING AREAS. IT WAS FOUND THAT THIS SAME RELATION WAS DEVELOPED WHEN SECTIONS OF PAVEMENT RESTING UPON PLASTIC SOILS WERE SUBJECTED TO THE SAME LOADING CONDITIONS. A CIRCULAR BEARING AREA OF 130 SQ. IN. WAS TENTATIVELY SELECTED AS A BASIS OF EVALUATING THE LOAD SUPPORTING CHARACTERISTICS OF A SOIL WITH RELATION TO AN OVERLYING ASPHALT PAVEMENT AND THE LOAD SUPPORTING CHARACTERISTICS OF THE PAVEMENT WITH RELATION TO THE SOIL UPON WHICH IT RESTS. THE METHOD OF EVALUATION IS DESCRIBED. /AUTHOR/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/20/20-013.pdf
• Supplemental Notes:
  • Vol 20, pp 271 - 278, 8 FIG. 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:
  • HUBBARD, P
  • Field, F C
• Publication Date: 1941

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Twentieth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 3-6, 1940
• Serial:
  • Highway Research Board Proceedings
  • Volume: 20
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Bearing capacity; Bituminous pavements; Cohesive soils; Deflection; Laboratory tests; Pavement design; Pavements; Plastic soils; Soils; Subgrade (Pavements); Thickness; Wheel loads
• Uncontrolled Terms: Pavement thickness
• Old TRIS Terms: Pavement deflection; Soil bearing capacity
• Subject Areas: Geotechnology; Highways; Pavements;

Filing Info

• Accession Number: 00205888
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Aug 15 1971 12:00AM