00179009

Component

http://onlinepubs.trb.org...s/trr/1977/642/642-009.pdf

https://scholar.google.co...tton&publication_year=1977

Characterization of the performance-related characteristics of fine-grained subgrade soils depends largely on the moisture and temperature regime in which they are found. This paper presents the results of a repeated-load testing program designed to produce some important materials properties for a variety of fine-grained subgrade soils. The materials properties characterized are compatible with a newly developed Federal Higwhay Administration computerized stress and distress analysis system, VESYS II, which represents flexible pavements as linearly viscoelastic layered media. Such characterization has not been done in previous studies. The materials characteristics presented in this study are resilient modulus, residual strain, and permanent deformation characteristics, all of which, as expected, vary with the number of load repetitions. The results, taken from repetitive load tests on three different soils having a range of clay contents of 20 to 70 percent, include the relation of the materials characteristics to mean stress, deviator stress, soil suction, clay content, and temperature. Because the equilibrium suction value of a subgrade soil beneath a pavement is relatied to the climatically controlled Thornthwaite Moisture Index, it is possible to infer under what conditions and in which parts of the United States special design considerations will be required for pavement structures that rest on the tested soils. /Author/

Publication of this paper sponsored by Committee on Environmental Factors Except Frost. 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.

01411486

pp 39-44

1977

Transportation Research Record

0309026717

Print

Figures (5) ; Maps; References (11) ; Tables (1)

Accelerated tests; Climate; Computer programs; Fine grained soils; Moisture content; Repeated loads; Resilience (Materials); Structural analysis; Subgrade (Pavements); Temperature; Testing

Geotechnology; Highways

TRIS, TRB

Aug 19 1978 12:00AM

• APPLICATION OF SOIL TAXONOMY IN ENGINEERING
• CLAY STRUCTURE AND RATE PROCESS THEORY
• DESICCATION OF SOILS DERIVED FROM VOLCANIC ASH
• DIAGNOSTIC SOIL HORIZONS IN SOIL TAXONOMY
• FACTORS THAT AFFECT WATER EROSION FROM CONSTRUCTION AREAS
• PARTICLE SIZE AND MINERALOGY IN SOIL TAXONOMY
• PHYSICOCHEMICAL CONSIDERATIONS IN THERMAL SUSCEPTIBILITY OF A BASE-COURSE MATERIAL (ABRIDGMENT)
• PREDICTION MODEL FOR UNSATURATED HYDRAULIC CONDUCTIVITY OF HIGHWAY SOILS
• RAINFALL FACTORS THAT AFFECT EROSION
• RELATION BETWEEN RESILIENT MODULUS AND STRESS CONDITIONS FOR COHESIVE SUBGRADE SOILS
• SAMPLING A GLACIAL SILTY CLAY
• SOIL MOISTURE AND TEMPERATURE REGIMES IN SOIL TAXONOMY
• SOIL PROPERTIES THAT AFFECT EROSION
• SOIL SERIES AND SOIL TAXONOMY
• SOIL TAXONOMY: AN OVERVIEW