00179008

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http://onlinepubs.trb.org...s/trr/1977/642/642-008.pdf

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

The importance of predicting the magnitude of the freeze coefficient in the relation of freeze contraction and pavement damage becomes evident as a base-course layer contracts during a freeze. This produces a buildup of tensile stress (1), which, when it exceeds the tensile strength, causes the base course to crack. Reported freeze cycles will propagate the crack through the asphalt surface. The larger the freeze coefficient is the higher the stresses and the greater the damage will be. The granular materials investigated in this study show contraction on freezing the climatic area of west Texas and much of the Southwest. This contraction is controlled by the properties of the clay minerals and the unique, membranelike clay particle structure they form around the larger silt particles. The freezing process forces the clay particles to reorient, which produces the noted volume contraction shown in the scanning electron microscope study. The amount of reorientation, and thus of volume change, is controlled by the specific surface area and the ion concentration. The specific surface area is a property of the clay fraction of the material. The ion concentration (resistivity) is a property of the granular portion of the material and represents the relative durability or solubility of the material. The ability of these two properties to model the freeze behavior is important because it shows how the coarse and fine-grained fractions of a material fit together and influence the environmental behavior of the material under freeze-thaw activity. /Author/

Publication of this paper sponsored by Committee on Physicochemical Phenomena in Soils. 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 36-38

1977

Transportation Research Record

0309026717

Print

Figures (6) ; Photos; References (2)

Clay; Defects; Electron microscopes; Forecasting; Freeze thaw durability; Freezing; Mathematical models; Pavement distress; Pavements; Physicochemical properties; Tension; Thermal properties

Models; Tensile stress

Geotechnology; Highways; Pavements

TRIS, TRB

Aug 19 1978 12:00AM

• APPLICATION OF SOIL TAXONOMY IN ENGINEERING
• CLAY STRUCTURE AND RATE PROCESS THEORY
• CLIMATIC MATERIALS CHARACTERIZATION OF FINE-GRAINED SOILS
• 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
• 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