CONTROL OF THE PLASTICITY INDEX OF SOIL-AGGREGATE MATERIALS USING HAND-FEEL TESTS

THREE COMMONLY USED HAND-FEEL OR EXPEDIENT TESTS WERE USED IN THIS STUDY - THREAD TOUGHNESS NEAR PLASTIC LIMIT, DRY STRENGTH, AND REACTION TO SHAKING. A NUMERICAL SCALE OF 0 TO 3 WAS APPLIED TO THE RANGE OF RESULTS FOR EACH OF THE TESTS TO PERMIT ANALYSIS OF CORRELATION WITH PLASTICITY INDEX. ON 58 BANKRUN GRAVELS FROM NEW YORK STATE, THE HAND-FEEL RESULTS OF AN EXPERIENCED TECHNICIAN CORRELATED WELL WITH PLASTICITY INDEX. THE SUM OF NUMERICAL RATINGS ON THE THREE TESTS MAY BE AS USEFUL AN INDICATOR OF PI AS THE RESULTS OF MULTIPLE REGRESSION. FOR THIS TECHNICIAN, THE LINEAR REGRESSION OF PI ON THE SUM OF THREAD TOUGHNESS (T.T.), DRY STRENGTH (D.S.), AND REACTION TO SHAKING (DIL.) RATINGS WAS PI = -2.4 + 0.99 (T.T. + D.S. + DIL.). THE CORRELATION COEFFICIENT WAS 0.917 (R SQUARED = 0.841) AND THE STANDARD ERROR OF ESTIMATE FOR PI WAS 0.97. THE RELATIONSHIPS BETWEEN RESULTS OF THE HAND-FEEL TESTS AND LIQUID LIMIT WERE LESS STRIKING THAN THE RELATIONSHIPS WITH PLASTICITY INDEX. A STUDY OF HAND-FEEL RATINGS BY INEXPERIENCED PERSONS SUGGESTED THAT SOME COACHING WOULD BE NECESSARY FOR REASONABLE CONSISTENCY IN RESULTS. /AUTHOR/

Language

  • English

Media Info

  • Media Type: Print
  • Features: Appendices; Figures; References; Tables;
  • Pagination: pp 63-69
  • Monograph Title: Laboratory and field soil tests; lateritic soils
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00229728
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:39AM