00229991

Component

https://onlinepubs.trb.or...bproceedings/28/28-035.pdf

EQUIPMENT AND METHODS OF TEST TO DETERMINE THE COEFFICIENT OF THERMAL CONDUCTIVITY OF SOILS AT VARIOUS CONDITIONS OF MISTURE CONTENT AND DENSITY ARE DESCRIBED. TESTS WERE MADE ON NINETEEN DIFFERENT SOILS WHICH REQRESENTED A WIDE TEXTURAL VARIETY, GRAVEL, SAND, SANDY LOAM, SILT LOAM, AND CLAY, AS WELL AS SOME CRUSHED ROCKS AND A FIBROUS PEAT. MOISTURE CONTENTS FOR TESTS VARIED FROM AIR-DRY TO VALUES GREATER THAN THE OPTIMUM MOISTURE CONTENT; DENSITIES VARIED FROM A LOOSELY-POURED CONDITION TO THE MAXIMUM OBTAINABLE BY HEAVY RAMMING. SOILS WERE TESTED AT SEVERAL MEAN TEMPERATURES. THE MOST IMPORTANT INFLUENCE OF TEMPERATURE DEPENDS ON WHETHER IT IS ABOVE OR BELOW FREEZING. FOR MOISTURE CONTENT INCREASES ABOVE ABOUT 6 TO 12 PERCENT, THE CONDUCTIVITY OF FROZEN SOILS BECOMES PROGRESSIVELY GREATER THAN THAT OF THE UNFROZEN SOIL. DENSITY AFFECTS THE THERMAL CONDUCTIVITY OF A SOIL IN ABOUT THE SAME MANNER FOR ALL SOILS, AT ANY MOISTURE CONTENT, AND FOR EITHER THE FROZEN OR UNFROZEN CONDITION. ON THE AVERAGE EACH ONE-POUND PER CUBIC CUBIC FOOT INCREASE IN DENSITY INCREASES THE THERMAL CONDUCTIVITY BY ABOUT 3 PERCENT. AN INCREASE IN MOISTURE CONTENT CAUSES AN INCREASE IN THERMAL CONDUCTIVITY. THIS IS TRUE UP TO THE POINT OF SATURATION. THE THERMAL CONDUCTIVITY OF A SOIL, AT A GIVEN DENSITY AND MOISTURE CONTENT, VARIES IN GENERAL WITH THE TEXTURE OF A SOIL, BEING RELATIVELY HIGH FOR COARSE TEXTURED SOILS AND RELATIVELY LOW FOR FINE TEXTURED SOILS. THE MINERAL COMPOSITION OF THE SOILS ALSO EFFECTS THE CONDUCTIVITY. QUARTZ TENDS TO GIVE HIGH VALUES WHEREAS MINERALS SUCH AS PLAGIOCLASE FELDSPAR AND PYROXENE, WHICH ARE CONSTITUENTS OF BASIC ROCKS, TEND TO GIVE LOW VALUES OF THERMAL CONDUCTIVITY. FOUR CHARTS ARE PRESENTED TO AID IN THE ESTIMATE OF THE THERMAL CONDUCTIVITY OF A SOIL. TWO OF THE CHARTS ARE FOR SANDS OR SANDY SOILS, AND TWO FOR SILT AND CLAY SOILS. ONE OF THE CHARTS FOR EACH TYPE OF SOIL IS FOR THE FROZEN CONDITION, THE OTHER FOR THE UNFROZEN. THESE CHARTS WILL GIVE CONDUCTIVITY VALES WITHIN AN ACCURACY OF 25 PERCENT. /AUTHOR/

Vol 28, pp 391-409, 18 FIG, 3 TAB. 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.

01490403

1949

Highway Research Board Proceedings

Digital/other

Density; Frozen soils; Graphics; Minerals; Moisture content; Soil tests; Soils; Temperature; Texture; Thermal conductivity

Graphical analysis

Geotechnology; Highways

TRIS, TRB

Sep 27 1971 12:00AM

• A FIELD METHOD FOR MEASURING THE PERMEABILITY OF SOIL BELOW A WATER TABLE
• A FUNDAMENTAL APPROACH TO THE STABILIZATION OF COHESIVE SOILS
• ACTIVITIES OF THE COMMITTEE ON REINFORCED CONCRETE RESEARCH OF THE AMERICAN IRON AND STEEL INSTITUTE
• APPLICATIONS OF ELECTRONIC TECHNIQUE TO TRAFFIC INSTRUMENTATION
• APPRAISAL OF RURAL ROUTES
• COORDINATION OF HIGHWAY AND CITY PLANNING
• CORRECTION OF PAVEMENT PUMPING BY MUDJACKING, UNDERSEALING, CONCRETE REPLACEMENT, CRACK SEALING AND SUBSEQUENT RESURFACING
• CURRENT DESIGN OF CONCRETE PAVEMENT IN NEW JERSEY
• DETERMINATION AND USE OF THE DYNAMIC MODULUS OF ELASTICITY OF CONCRETE
• DURABILITY OF PORTLAND CEMENT CONCRETE DETERMINED BY PRIMARY DIRECTIONAL FREEZING AND UNIFORM THAWING
• EFFECT OF ENTRAINED AIR ON THE BOND STRENGTH OF CONCRETE
• EFFECT OF MATERIAL RETAINED ON THE NUMBER 4 SIEVE OF THE COMPACTION TEST OF SOIL
• EVALUATING HAZARDS AT RAILROAD GRADE CROSSINGS
• EXPERIENCE WITH REFLECTORIZED TRAFFIC PAINT
• FINAL REPORT OF PROJECT COMMITEE NO 1, MAINTENANCE OF CONCRETE PAVEMENT AS RELATED TO THE PUMPING ACTION OF SLABS
• FREEZE AND THAW DURABILITY OF AIR-ENTRAINED CONCRETE USING INDIANA AGGREGATES
• FUNCTIONAL DESIGN FOR GROUND TRANSPORTATION FACILITIES AT AIRPORTS
• GENERAL ENGINEERING APPROACH TO THE CLASSIFICATION AND IDENTIFICATION OF SOILS
• HIGHWAY EXPERIENCE WITH THIXOTROPIC VOLCANIC CLAY
• HIGHWAY SMOKE STUDIES
• INVESTIGATION OF FIELD AND LABORATORY METHODS FOR EVALUATING SUBGARDE SUPPORT IN THE DESIGN OF HIGHWAY FLEXIBLE PAVEMENTS
• LABORATORY EXPERIMENTS WITH LIME-SOIL MIXTURES
• LIFE CHARACTERISTICS OF HIGHWAY SURFACES
• LIGHTING OF SNOW AND ICE CONTROL EQUIPMENT
• MINIMUM TIME PERIODS-ORIGIN AND DESTINATION SURVEYS
• MISSOURI'S METHOD OF JOB EVALUATION
• OBJECTIVES AND FINDINGS OF HIGHWAY NEEDS STUDIES
• OBSERVATIONS OF MOISTURE CONTENTS AND DENSITIES OF SOIL TYPE BASES AND THEIR SUBGRADES
• PHYSICAL CONSTITUTION OF HARDENED PORTLAND CEMENT PASTE (AS REVEALED BY STUDIES OF ITS WATER CONTENT) AND ITS RELATION TO THE PROPERTIES OF HARDENED CONCRETE
• REPORT OF COMMITTEE ON LOAD CARRYING CAPACITY OF ROADS AS AFFECTED BY FROST ACTION
• REPORT ON THE COMMITTEE ON NIGHT VISIBILITY
• ROAD ROUGHNESS MEASUREMENTS OF VIRGINIA PAVEMENTS
• SEPARATION, FRACTIONATION AND MINERALOGY OF CLAYS IN SOILS
• SHEAR FAILURE IN ANISOTROPIC MATERIALS POSSESSING ANY VALUES OF COHESION AND ANGLE OF INTERNAL FRICTION
• SHEARING STRESSES IN SUPPORTED AND UNSUPPORTED VERTICAL SLOPES
• SOME NUMERICAL SOLUTIONS OF STRESSES IN TWO- AND THREE- LAYERED SYSTEMS
• SOME OBSERVATIONS ON THE VALUE OF TIME SAVED TO MOTORISTS
• STRESSES AND DEFLECTIONS IN FLEXIBLE PIPE CULVERTS
• THE EFFECT OF BUILDING SPACE USAGE ON TRAFFIC GENERATION AND PARKING DEMAND
• THE FACTORS UNDERLYING THE RATIONAL DESIGN OF PAVEMENTS
• THE STATE-LOCAL PARTNERSHIP IN RURAL HIGHWAY MANAGEMENT
• TRENDS IN FINANCING COUNTY AND LOCAL RURAL ROADS
• USE OF REINFORCEMENT IN CONCRETE PAVEMENTS
• WASHINGTON METHOD OF DETERMINING AIR IN FRESH CONCRETE
• WEATHERING STUDY OF SOME AGGREGATES
• WEAVING TRAFFIC
• WELDED BRIDGES