00205317

Monograph

http://onlinepubs.trb.org...ubs/nchrp/nchrp_rpt_10.pdf

DATA FROM THE AASHO ROAD TEST AND SIMILAR EXPERIMENTS WERE ANALYZED AS THEY APPLIED TO THE STRUCTURAL BEHAVIOR OF FLEXIBLE PAVEMENTS IN TERMS OF EXISTING THEORIES. DATA ON DEFLECTION AND STRESSES MEASURED DURING THE TEST, AS WELL AS DATA ON MECHANISMS OF PAVEMENT FAILURE, ARE EMPLOYED AND ANALYZED. PARTICULAR ATTENTION IS DEVOTED TO MECHANISMS OF FAILURE UNDER CRITICAL LOADS. IT APPEARS THAT THERE EXISTS, FOR A GIVEN SUBGRADE, A CRITICAL SUBGRADE BEYOND WHICH THE RUTTING IS EXTENDED INTO THE SUBGRADE. THIS FINDING JUSTIFIES SELECTION OF THE LIMITING SUBGRADE STRESS AS A DESIGN CRITERION. IT IS SHOWN THAT THE LOAD SPREADING ABILITIES OF FLEXIBLE PAVEMENTS WITH CONVENTIONAL UNTREATED BASES ARE VERY LIMITED. THE STRESSES AND DEFLECTIONS VARY WITH PAVEMENT TEMPERATURE AND THE DEGREE OF SATURATION OF THE SUBGRADE, AS WELL AS WITH THE VEHICLE SPEED. AT CREEPING VEHICLE SPEEDS OVER THE MAJOR PART OF THE YEAR, EXCEPTING FROST PERIODS, THE STRESS AND DEFLECTION PATTERNS ARE SIMILAR TO THOSE PREDICTED BY THE BOUSSINESQ THEORY FOR HOMOGENEOUS SOLID.

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. No 10, 31 PP, 23 FIG, 17 TAB, 44 REF

31p

1964

NCHRP Report

Digital/other

Boussinesq equation; Deflection; Design; Flexible pavements; Pavement design; Percent saturation; Speed; Stresses; Structural analysis; Structural mechanics; Subgrade (Pavements); Temperature; Theory; Vehicles

AASHO Road Test

Data; Design criteria; Structural behavior

Design; Highways; Pavements; Vehicles and Equipment

TRIS

Oct 20 1994 12:00AM