01020563

Component

https://doi.org/10.3141/1967-02

http://scholar.google.com...nrad&publication_year=2006

The thermal conductivity of soils and granular materials is one of the most important parameters for frost action and thermal analyses in pavements and civil engineering infrastructures. Many predictive models were developed in past decades to correlate thermal conductivity of soils to basic soil index properties. Recently, relationships that cover the complete range of saturation in unfrozen and frozen states were established to consider the effects of porosity, geologic origin and mineralogy, soil type, particle type, and unfrozen water for a variety of soils. A simple and practical tool was developed to estimate thermal conductivity of pavement granular materials and subgrade soils directly as a function of the degree of saturation (water content) on the basis of these generalized thermal conductivity relationships. A new thermal conductivity equation is proposed to estimate thermal conductivity functions for soils such as well-graded gravels; coarse, medium, and fine sands; silty and clayey soils, and peat in unfrozen and frozen states. The new equation was successfully used to predict thermal conductivity functions of four different types of unfrozen and frozen soils from the literature (gravel, sand, clay, and peat). A set of charts is proposed to assess thermal conductivity of soils readily. The use of these charts is illustrated with examples. Both numerical and graphical estimating methods proved to provide accurate prediction results for thermal conductivities for soils and construction materials.

01037970

English

pp 10-19

2006

Transportation Research Record: Journal of the Transportation Research Board

0309099765

Print

Figures (6) ; References (26) ; Tables (4)

Charts; Clay soils; Equations; Frost action; Granular materials; Gravel; Mathematical models; Mathematical prediction; Peat; Percent saturation; Sand; Subgrade (Pavements); Subgrade materials; Thermal conductivity

Silty soils

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

PRP, TRIS, TRB, ATRI

Mar 3 2006 10:16AM

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• Comparative Design Case Studies of Pavement Performance on Expansive Soils
• Design Model for Roughness and Serviceability of Pavements on Expansive Soils
• Duration of Spring Thaw Recovery for Aggregate-Surfaced Roads
• Effectiveness of Open-Graded Base Layer on Subgrade Moisture Regime and Overall Pavement Performance
• Estimation of Expected Moisture Contents for Pavements by Environmental and Soil Characteristics
• Evaluation of Resilient Modulus Model Parameters for Mechanistic–Empirical Pavement Design
• Field Monitoring of Moisture Variations Under Flexible Pavement
• Hauling with Full Axle Weights and Reduced Tire Pressures on Weight-Restricted Roads in British Columbia
• Implementation of Spring Load Restrictions Using a Deflection-Calibrated Thaw Index
• Investigations of Environmental and Traffic Impacts on "Mechanistic-Empirical Pavement Design Guide" Predictions
• Laboratory Evaluation of Untreated and Treated Pavement Base Materials: Repeated Load Permanent Deformation Test
• Resilient Modulus Estimation System for Fine-Grained Soils
• Safety and Cost-Effectiveness of Approach Guardrail for Bridges on Low-Volume Roads
• Safety Effectiveness of Stop Control at Ultralow-Volume Unpaved Intersections
• Two-Dimensional Moisture Flow–Soil Deformation Model for Application to Pavement Design