00229992

Component

https://onlinepubs.trb.or...bproceedings/28/28-043.pdf

A WORKING METHOD IS DESCRIBED FOR SEPARATION, FRACTIONATION AND IDENTIFICATION OF COLLOID AND NEAR COLOIDAL CALY MINERALS IN SOILS. THE TECHNICAL INFORMATION PRESENTED PERTAINS TO SUPER-CENTRIFUGATION, ELECTRON- MICROSCOPY AND X-RAY DIFFRACTION. TWENTY-TWO SAMPLES HAVE BEEN INVESTIGATED IN CONJUNCTION WITH A SOIL STUDY OF PUMPING PAVEMENTS. SOILS WERE FIRST DISPERSED AND SEPARATED BY GRAVITY SEDIMENTATION. FRACTIONATION WAS ACCOMPLISHED BY CONTROLLED SUPER-CENTRIFUGATION. THE SEPARATED FRACTIONS WERE PURIFIED AND THEN ANALYZED BY X-RAY DIFFRACTION. COMPUTED SIZE FRACTIONS WERE CHECKED BY SHADOW CASTINGS AND LINEAL DIMENSIONS ON ELECTRON MICROGRAPHS. RESULTS INCLUDE IDENTIFICATION OF THE MINERAL OR MINERALS PRESENT AND THE PROPERTIES OF THE NATURAL SAMPLE FROM WHICH THE COLLOIDAL FRACTIONS WERE EXTRACTED. /AUTHOR/

Vol 28, pp 469-480, 9 FIG, 4 TAB, 9 REF. 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

Centrifuges; Clay minerals; Colloids; Diffraction; Distillation; Electron microscopes; Mineralogy; Pumping (Pavements); Sedimentation; Soils; X rays

X-ray diffraction

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
• 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
• THE THERMAL CONDUCTIVITY OF SOILS
• 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