CLOSURE ON STANDARDIZATION OF PARTICLE-SIZE RANGES

IN ITS PAPER ON GRAIN-SIZE CLASSES FOR SAND, SILT, AND CLAY FOR USE BY PROFESSIONAL GROUPS OF ENGINEERS, GEOLOGISTS, AND SOIL SCIENTISTS, THE COMMITTEE ON SOIL PROPERTIES OF THE SOIL MECHANIC AND FOUNDATION RECOMMENDED CLASSES THAT LED TO ADDITIONAL DISCUSSION AND SUGGESTION. THE COMMITTEE REPORT SUMMARIZED INTERDISCIPLINARY DISCUSSIONS AMONG ENGINEERS, GEOLOGISTS, AND SOIL SCIENTISTS. THUS, THE RECOMMENDATIONS REPRESENT COMPROMISES AMONG THE INTEREST AND NEEDS OF THESE DIVERSE PROFESSIONAL GROUPS. EDGE HAS SUGGESTED THAT THE NO. 8 SIEVE BE CONSIDERED AS THE SAND-GRAVEL BOUNDARY AND HAS INDICATED THAT THIS SIEVE IS USED IN CURRENT AASHO AND ASTM AGGREGATE GRADATION REQUIREMENTS. IN THE INTERSOCIETY COMMITTEE, THIS ALTERNATIVE RECEIVED NO SUPPORT FROM THE AASHO AND ASTM REPRESENTATIVES AND THEIR POSITION PAPERS. THERE APPEARS TO BE NO POSIBILITY THAT ANYTHING OTHER THAN THE NO. 10 OR NO. 4 SIEVE SIZES WOULD BE ACCEPTED WIDELY BY THE ENGINEERING PROFESSION OR THE OTHER SCIENTIFIC DISCIPLINES REPRESENTED IN THE DISCUSSIONS. TURNBULL PROPERLY HAS QUESTIONED THE ACCURACY OF GRAIN-SIZE DETERMINATIONS, PARTICULARLY FOR THE CLAY FRACTION. HE ALSO SUGGESTED THE USE OF CLASSIFICATION AREA AS MORE MEANINGFUL INDEX OF THE PHYSICAL PROPERTIES OF A SOIL. IT IS AGREED THAT INDEX PROPERTIES, SUCH AS TURNBULL'S CLASSIFICATION AREA OF THE ATTERBERG LIMITS, MAY PROVIDE MORE SIGNIFICANT GUIDES TO PHYSICAL PROPERTIES OF FINE-GRAINED SOILS THAN IS PROVIDED BY GRAIN-SIZE INFORMATION. HOWEVER, THE CONSIDERATION OF ALTERNATE CLASSIFICATION OR INDEX SYSTEMS WAS BEYOND THE SCOPE OF THE INTER-DISCIPLINARY DISCUSSIONS, WHICH WERE LIMITED TO THE STANDARDIZATION OF PARTICLE-SIZE RANGES.

  • Supplemental Notes:
    • Vol 97, No SM 1, P 244
  • Publication Date: 0

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  • Accession Number: 00229954
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 2 1971 12:00AM