THE FABRIC OF NATURAL CLAYS AND ITS RELATION TO ENGINEERING PROPERTIES

THE FABRIC OF AN EARTH MATERIAL MAY BE DEFINED AS THE APPEARANCE OR PATTERN PRODUCED BY THE SHAPES OR ARRANGEMENT OF THE SOIL GRAINS, INDEPENDENTLY OF THE EXTERNAL BOUNDARIES OF THE MATERIAL. THEORETICAL CONSIDERATION AND AVAILABLE DATA INDICATE THAT THE FLOCCULATION OF CLAYS IS CAUSED BY NEGATIVE PARTICLE SURFACE TO POSITIVE PARTICLE EDGE ELECTROSTATIC ATTRACTIVE FORCES, RESULTING IN A RANDOM PARTICLE ORIENTATION. DISPERSION, CAUSED BY HIGH REPULSIVE FORCES BETWEEN PARTICLES, LEADS TO A PARALLEL ASSOCIATION OF PARTICLES, AT LEAST WITHIN SMALL ZONES. INTERPARTICLE FORCES AT THE TIME OF DEPOSITION AS WELL AS SUBSEQUENT HISTORY OF THE DEPOSIT ARE BELIEVED RESPONSIBLE FOR THE FABRIC OF NATURAL CLAYS. THE MICROSCOPIC STUDY OF THIN SECTIONS, PREPARED BY A SPECIAL TECHNIQUE, FROM SEVERAL CLAYS AT NATURAL WATER CONTENT IN BOTH THE UNDISTURBED AND REMOLDED STATE HAS YIELDED DIRECT INFORMATION ON THE FABRIC. PHOTOMICROGRAPHS ARE PRESENTED INDICATING VARIOUS FABRICS FORMED IN THE UNDISTURBED AND REMOLDED CLAYS ARE EXPLAINED IN TERMS OF THE INTERPARTICLE FORCES AND HISTORY OF THE MATERIAL SUBSEQUENT TO DEPOSITION OR REMOLDING. THE REMOLDING OF THE MARINE CLAYS STUDIED LED TO A SMALL BUT DETECTABLE IMPROVEMENT OF THE CLAY ORIENTATION WITHING SMALL AREAS. THE EFFECT OF REMOLDING ON THE FABRICS OF FRESH WATER CLAYS WAS LARGELY DEPENDENT ON THE INTENSITY OF PARALLEL CLAY ORIENTATION AND THE AMOUNT OF PRECOMPRESSION IN THE UNDISTURBED SAMPLE. THE MAGNITUDES OF THE DIFFERENCES BETWEEN UNDISTURBED AND REMOLDED ENGINEERING PROPERTIES OF BOTH THE MARINE AND FRESH WATER CLAYS WERE FOUND TO CORRELATE, IN GENERAL, WITH THE DIFFERENCES BETWEEN THE UNDISTURBED AND REMOLDED FABRIC. THE MORE ORIENTED THE REMOLDED FABRIC. THE MORE ORIENTED THE REMOLDED CLAY WITH RESPECT TO THE UNDISTURBED, THE GREATER WERE THE DIFFERENCES BETWEEN THE UNDISTURBED AND REMOLDED ENGINEERING PROPERTIES. /AUTHOR/

  • Supplemental Notes:
    • Vol 35, pp 693-713, 8 FIG, 3 TAB, 10 PHOT, 21 REF
  • Authors:
    • Mitchell, J K
  • Publication Date: 1956

Media Info

  • Monograph Title: Proceedings of the Thirty-Fifth Annual Meeting of the Highway Research Board, Washington, D.C., January 17-20, 1956
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00230020
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 1971 12:00AM