00231016

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http://onlinepubs.trb.org...s/hrr/1967/177/177-002.pdf

A REVIEW OF THE AVAILABLE LITERATURE INDICATES THAT DRY DENSITY ALONE IS NOT ALWAYS A RELIABLE INDEX FOR THE EVALUATION OF SHEAR STRENGTH AND COMPRESSIBILITY OF COMPACTED SOILS. OTHER FACTORS THAT AFFECT THESE ENGINEERING PROPERTIES FOR COHESIONLESS AND COHESIVE SOILS ARE DISCUSSED. THE SHEARING RESISTANCE AND COMPRESSIBILITY OF COHESIONLESS MATERIALS ARE INFLUENCED BY MINERALOGICAL COMPOSITION, SIZE, GRADATION, SURFACE ROUGHNESS AND SHAPE OF THE INDIVIDUAL PARTICLES. THE ADDITIONAL FACTORS THAT INFLUENCE THE AS-COMPACTED SHEAR STRENGTH OF COMPACTED COHESIVE MATERIALS ARE MINERALOGICAL COMPOSITION MOLDING WATER CONTENT, SOIL STRUCTURE, EFFECTIVE STRESS, THIXOTROPY AND THE STRAIN LEVEL AT WHICH STRENGTH IS DEFINED. THE SOIL STRUCTURE WAS FOUND TO BE AN IMPORTANT FACTOR INFLUENCING THE STRENGTH ONLY WHEN IT IS DEFINED AT LOW STRAIN LEVELS, SUCH AS IN THE CBR-TYPE TEST. THE SOAKED STRENGTH OF CO- HESIVE MATERIALS IS FURTHER INFLUENCED BY THE SWELLING POTENTIAL OF A PARTICULAR SOIL AND THE AMOUNT OF SWELLING THAT IS ALLOWED TO TAKE PLACE DURING SOAKING. THE COMPRESSIBILITY OF COMPACTED COHESIVE SOILS IS INFLUENCED BY THE SAME FACTORS THAT INFLUENCE THE SHEAR STRENGTH WITH THE ADDITIONAL FACTOR THAT SOAKING UNDER A SURCHARGE LOAD MAY LEAD TO LARGE DEFORMATIONS. ALTHOUGH IT APPEARS THAT DRY DENSITY IS NOT ENTIRELY ADEQUATE FOR THE FIELD CONTACT OF ENGINEERING PROPERTIES OF COMPACTED MATERIALS, FOR CONSTRUCTION THERE IS NO OTHER SIMPLE TEST THAT CAN BE PRESENTLY SUGGESTED AS AN ALTERNATIVE CORD-PRODUCT CONTROL PROCEDURE. /AUTHOR/

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01410128

English

pp 4-21

1967

Highway Research Record

Print

Figures (7) ; References (40)

Cohesive soils; Compaction; Compressibility; Construction management; Dry density; Granular soils; Mineralogy; Moisture content; Particles; Shape; Shear strength; Soil structure; Stresses; Texture; Thixotropy

Particle shape; Particle size distribution

Construction; Geotechnology; Highways

TRIS, TRB

Aug 15 2004 2:40AM

• A CRITICAL REVIEW OF THE DENSITY TESTING PROGRAM IN WASHINGTON
• A Statistical Analysis of Embankment Compaction
• COMPACTION CONTROL OF GRANULAR BASE COURSE MATERIALS BY USE OF NUCLEAR DEVICES AND A CONTROL STRIP TECHNIQUE
• CORRELATION AND CONFERENCE OF PORTABLE NUCLEAR DENSITY AND MOISTURE SYSTEMS.
• CURRENT SPECIFICATIONS, FIELD PRACTICES AND PROBLEMS IN COMPACTION FOR HIGHWAY PURPOSES
• DENSITY CONTROL: ITS BENEFITS AND COMPLEXITIES
• EVALUATION OF RAPID FIELD METHODS FOR MEASURING COMPACTED SOIL PROPERTIES
• EVALUATION OF SOIL COMPACTION BY RHEOLOGICAL TECHNIQUES
• EXPERIMENTAL STUDY OF PULSE VELOCITIES IN COMPACTED SOILS
• Factors Influencing the Application of Nuclear Techniques to Soil Compaction Control
• FIELD STUDY OF SOIL COMPACTION
• NEW METHOD FOR LABORATORY SOIL COMPACTION BY VIBRATION
• PRACTICAL APPLICATIONS OF THE AREA CONCEPT TO COMPACTION CONTROL USING NUCLEAR GAGES
• PROPERTIES OF FIELD COMPACTED SOILS
• RETENTION OF DENSITY IN LOESS SUBGRADES AND SOIL-AGGREGATE BASE MIXTURES