00205932

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http://onlinepubs.trb.org...s/hrr/1971/345/345-002.pdf

THE PURPOSE IS TO DEFINE BETTER THOSE PROPERTIES OF GRANULAR BASE MATERIALS THAT CONTRIBUTE TO THE RESILIENT RESPONSE OF PAVEMENT STRUCTURES. A STUDY IS INCLUDED OF THE INFLUENCE OF AGGREGATE DENSITY, AGGREGATE GRADATION (PERCENT PASSING NO. 200 SIEVE), AND DEGREE OF SATURATION ON THE RESILIENT RESPONSE OF TWO AGGREGATES REPRESENTATIVE OF THOSE USED IN THE CONSTRUCTION OF ASPHALT CONCRETE PAVEMENTS. TESTS CARRIED OUT IN TRIAXIAL COMPRESSION, CONSISTED OF APPLYING REPEATED AXIAL STRESSES WITH REALISTIC STRESS HISTORIES AT A FIXED FREQUENCY AND AT A LOAD DURATION REPRESENTATIVE OF THAT EXPECTED IN THE FIELD. FOR BOTH GRANULAR MATERIALS, THE RESILIENT MODULUS INCREASED CONSIDERABLY WITH AN INCREASE IN CONFINING PRESSURE AND ONLY SLIGHTLY WITH AN INCREASE IN AXIAL STRESS. POISSON'S RATIO INCREASED WITH A DECREASE IN CONFINING PRESSURE AND AN INCREASE IN REPEATED STRESS. THE RESILIENT MODULUS AND POISSON'S RATIO WERE ALSO AFFECTED TO LESSER DEGREES BY DENSITY, PERCENT PASSING THE NO. 200 SIEVE, AND DEGREE OF SATURATION. AN ANALYSIS OF A CONVENTIONAL ASPHALT CONCRETE PAVEMENT OVER A SANDY CLAY SUBGRADE INDICATED THAT REASONABLE CHANGES IN THE MODULUS OR POISSON'S RATIO OF THE GRANULAR BASE LAYER CAN RESULT IN CONSIDERABLE CHANGES IN THE RESPONSE OF THE PAVEMENT STRUCTURE TO LOAD. /AUTHOR/

Sponsored by Committee on Strength and Deformation Characteristics of Pavement Sections and presented at the 50th Annual Meeting. 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.

01410280

pp 15-31

1971

Highway Research Record

Print

Figures (19) ; References (12) ; Tables (2)

Aggregate gradation; Aggregates; Axial loads; Base course (Pavements); Compression; Density; Granular materials; Modulus; Pavement layers; Percent saturation; Poisson ratio; Pressure; Resilience (Materials); Testing; Variables

Axial stress; Base; Confinement; Pavement structure; Triaxial compression

Geotechnology; Highways; Pavements

TRIS, TRB

Sep 13 1971 12:00AM

• ANALYSIS OF STRESSES AND DISPLACEMENTS IN THREE-LAYER VISCOELASTIC SYSTEMS
• BEHAVIOR OF HIGH EARTH EMBANKMENT ON US-101
• CHART SOLUTIONS FOR ANALYSIS OF EARTH SLOPES
• COMPRESSIVE STRESS PULSE TIMES IN FLEXIBLE PAVEMENTS FOR USE IN DYNAMIC TESTING
• DEFLECTION AND CURVATURE AS CRITERIA FOR FLEXIBLE PAVEMENT DESIGN AND EVALUATION
• DETERMINATION OF STRESS DISTRIBUTION AROUND CIRCULAR TUNNELS USING CONFORMAL MAPPING TECHNIQUE
• NEW METHOD FOR DETERMINATION OF TENSILE STRENGTH OF SOILS
• PROBABILISTIC APPROACH TO THE DETERMINATION OF SAFETY FACTORS FOR THE BEARING CAPACITY OF COHESIVE SOILS
• SPECIAL TESTS FOR DESIGN OF HIGH EARTH EMBANKMENTS ON US-101
• Stresses and Displacements in an Electric Mass Under Assumed and Measured Tire Pressures