00677583

Component

http://onlinepubs.trb.org...trr/1994/1462/1462-011.pdf

https://scholar.google.co...illi&publication_year=1994

Several transportation agencies use the AASHTO-recommended resilient modulus as the fundamental parameter in the mechanistic analysis and design of pavements. At present there are several types of dynamic testing devices calibrated to measure resilient modulus. The repeated triaxial device is popular because of its repeatability, reliability, and ease of operation. Testing procedures and internal deformation measurements play a crucial role in testing. A statistically designed experiment was used to compare the influence of these factors. Two testing procedures, AASHTO T-294-1992 and AASHTO T-292-1991, were evaluated, and two separate measurement systems inside the triaxial cell were used to measure the axial deformations. Both cohesive and granular soils were tested. The influence of testing procedures and measurement systems are presented in the form of normalized factors, which are discussed with respect to the test variables and confining and deviatoric stresses. The testing procedure appears to influence test results for sand specimens, possibly due to the variation in magnitudes of testing stresses. The measurement system has a greater influence on clay specimens due to a combination of several factors such as soil fabric, stress dependency behavior, and end friction effects. The type of soil, testing procedures, and location of the internal, linear variable differential transformers and their influence on the regression model constants are discussed and graphically presented.

This paper appears in Transportation Research Record No. 1462, Compaction of Difficult Soils and Resilient Modulus Testing. 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

01495760

English

p. 91-101

1994

Transportation Research Record

0309060680

Figures (7) ; Photos (1) ; References (17) ; Tables (4)

Clay; Cohesive soils; Deformation; Deviatoric stress; Differentials (Gears); Granular soils; Graphics; Location; Mathematical models; Modulus of resilience; Regression analysis; Sand; Test procedures; Testing equipment; Transformers

Graphical analysis; Linear variable differential transformers

Data and Information Technology; Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB

May 3 1995 12:00AM

• ACCURACY IMPROVEMENT OF EXTERNAL RESILIENT MODULUS MEASUREMENTS USING SPECIMEN GROUTING TO END PLATENS
• ANALYSIS OF PROCEDURES FOR ESTABLISHING IN SITU SUBGRADE MODULI
• BEHAVIOR OF EXPANDED POLYSTYRENE BLOCKS
• COMPACTED CLAY EMBANKMENT FAILURES
• COMPACTION CONTROL CRITERIA FOR CLAY HYDRAULIC BARRIERS
• COMPACTION SPECIFICATIONS FOR LOW HYDRAULIC CONDUCTIVITY CLAY EMBANKMENTS
• FACTORS INFLUENCING DETERMINATION OF A SUBGRADE RESILIENT MODULUS VALUE
• INVESTIGATION OF ROAD WIDENING ON SOFT SOILS USING A SMALL CENTRIFUGE
• RESILIENT MODULI OF AGGREGATE MATERIALS: VARIABILITY DUE TO TESTING PROCEDURE AND AGGREGATE TYPE
• RESILIENT MODULUS OF SUBGRADE SOILS: COMPARISON OF TWO CONSTITUTIVE EQUATIONS
• ROCK CORRECTION ISSUES IN COMPACTION SPECIFICATIONS FOR HIGH GRAVEL CONTENT SOIL