Call number:
ZSP-201-87/2
In:
CRREL Report, 87-2
Description / Table of Contents:
This is the third in a series of four reports on the laboratory and field testing of a number of road and airfield subgrades, covering the laboratory repeated-load triaxial testing of five soils in the frozen and thawed states and analysis of the resulting resilient modulus measurements. The laboratory testing procedures allow simulation of the gradual increase in stiffnessfound in frost-susceptible soils after thawing. The resilient modulus is expressed in a nonlinear model in terms of the applied stresses, the soil moisture tension level (for unfrozen soil), the unfrozen water content (for frozen soil) and the dry density. The resilient modulus is about 10 GPa for the frozen material at temperatures in the range of -5° to -8° C. The decrease in modulus with increasing temperature was well-modeled in terms of the unfrozen water content. Upon thaw, the modulus dropped to about 100 MPa and generally increased with increasing confining stress and decreased with increasing principal stress ratio. The modulus also increased with the soil moisture tension level. The resilient Poisson's ratio did not appear to be a systematic function of any of the test variables.
Type of Medium:
Series available for loan
Pages:
iii, 36 Seiten
,
Illustrationen
Series Statement:
CRREL Report 87-2
URL:
https://apps.dtic.mil/dtic/tr/fulltext/u2/a179253.pdf
URL:
https://hdl.handle.net/11681/9037
Language:
English
Note:
CONTENTS
Abstract
Preface
Introduction
Test sections and materials
Specimen preparation
Test soils
Asphalt concrete
Laboratory testing
Soil testing
Waveforms of applied stress
Asphalt concrete
Data reduction and analysis
Soil
Asphalt concrete
Results and discussion
General
Resilient modulus
Summary
Conclusions
Literature cited
Appendix A: Soil moisture tension versus water content for several test soils
Appendix B: Tabulated results for all tests on frozen and thawed soils
Location:
AWI Archive
Branch Library:
AWI Library
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