00230018

Component

https://onlinepubs.trb.or...bproceedings/35/35-044.pdf

A PROGRESS REPORT IS MADE ON A STUDY AIMED AT PERFECTING METHODS OF DETERMINING SOIL COMPOSITION AND CORRELATING SOIL COMPOSITION WITH ENGINEERING BEHAVIOR. NOT ONLY IS THE NATURE OF SOIL COMPONENTS IMPORTANT, BUT THE MANNER IN WHICH THESE COMPONENTS ARE ARRANGED AND THE GEOLOGICAL HISTORY OF THE SOIL CAN HAVE CONSIDERABLE INFLUENCE ON THE SOIL PROPERTIES. SOME FACTS REVEALED WERE: A. OCCURRENCE OF MINERALS 1. QUARTZ AND FELDSPARS, THE MOST COMMON MINERALS IN SANDS AND SILTS, OCCUR IN CLAY SIZES. 2. CLAYS ARE PREDOMINATELY CRYSTALLINE. 3. ILLITE, NONTRONITE, AND CHLORITE ARE VERY ABUNDANT CLAY-SIZE MINERALS. 4. MIXTURES OF MINERALS IN SOIL FINES ARE THE RULE RATHER THAN THE EXCEPTION. 5. INTERSTRATIFICATION OF MINERALS IS VERY COMMON. B. CORRELATION OF COMPOSITION AND BEHAVIOR 1. ATTAPULGITE AND HALLOYSITE CAN CAUSE UNUSUAL ENGINEERING PROPERTIES, SUCH AS LOW COMPACTED DENSITY, HIGH MOLDING WATER CONTENT, AND HIGH FROST SUSCEPTIBILITY. 2. HALLOYSITE CAN BE PLASTIC. 3. MONTMORILLONOIDS AND ORGANIC MATTER APPEAR IN A HIGH PERCENTAGE OF SOILS INVOLVED IN ENGINEERING FAILURES CAUSED BY SOIL RUPTURE OR VOLUME CHANGE. 4. MANY CLAYS HAVE PART OF THEIR FINES FIRMLY CEMENTED--IN THESE SOILS THE PERCENTAGE MINUS 2 MU FAILS TO INDICATE THE PERCENTAGE OF CLAY PRESENT. A SCHEME FOR CLASSIFICATION OF SOIL COMPOSITION WAS GIVEN. COMPOSITIONAL ANALYSIS WAS DISCUSSED. ENGINEERING SIGNIFICANCE OF RESULTS EXTENDED TO NATURE OF FINES, CEMENTATION OF FINES, RELATIONS BETWEEN COMPOSITION AND PROPERTIES, AND A TABLE OF SOIL COMPOSITION AND PROPERTIES FOR 26 SAMPLES.

Vol 35, pp 661-677, 6 FIG, 7 TAB, 19 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.

01490392

1956

Highway Research Board Proceedings

Digital/other

Chemical analysis; Chlorites; Clay; Engineering; Failure; Feldspar; Fines (Materials); Halloysite; Illites; Minerals; Montmorillonite; Properties of materials; Quartz; Sand; Silts; Soil chemistry; Soil types; Soils

Soil classification; Soil properties

Geotechnology; Highways; Materials

TRIS, TRB

Aug 15 1971 12:00AM