BEARING INDEX OF SOIL AS A CRITERION FOR THE MAXIMUM DENSITY REQUIREMENT

A METHOD IS PROPOSED FOR THE USE OF STRENGTH AS A CRITERION FOR THE DESIGN OF COMPACTED SOIL AND SOIL- AGGREGATE MIXTURES TO BE USED IN CONSTRUCTING SUB-BASES AND BASES FOR FLEXIBLE PAVEMENTS. THE DATA PRESENTED SHOW THAT AT MAXIMUM DENSITY AND OPTIMUM WATER CONTENT, AS OBTAINED BY THE STANDARD A.S.T.M. METHOD, THE STRENGTH OF SOIL MIXTURES VARIES WIDELY AND IN GENERAL IS QUITE LOW. IT IS ALSO SHOWN THAT, WITH A GIVEN SOIL MIXTURE, THE STRENGTH INCREASES AS THE BULK DENSITY INCREASES. ADVANTAGE IS TAKEN OF THIS FACT TO DEVISE A METHOD WHEREBY EQUAL STRENGTHS MAY BE DEVELOPED IN ALL SOIL MIXTURES. THE METHOD PROPOSED IS AS FOLLOWS: (1) MAXIMUM DENSITY AND OPTIMUM MOISTURE IS DETERMINED ON A GIVEN SOIL, OR SOIL-AGGREGATE, MIXTURE BY THREE COMPACTIVE EFFORTS WHOSE ENERGIES ARE IN THE RATIO OF ABOUT ONE, TWO, AND FOUR. THE STRENGTH OF THE SOIL MIXTURE AT THE THREE MAXIMUM DENSITIES AND OPTIMUM MOISTURES IS THEN DETERMINED, AND THE STRENGTHS OBTAINED ARE PLOTTED AGAINST DENSITIES. FROM THE RESULTING GRAPHS THE DENSITIES CAN BE DETERMINED FOR THE VARIOUS MIXTURES UNDER STUDY WHICH WILL GIVE EQUAL STRENGTH. THE STRENGTH OF THE MIXTURE IS TAKEN AS THE LOAD WHICH IS REQUIRED TO PRODUCE 1/4 IN. TOTAL DEFORMATION WITH A TWO IN. DIAMETER BEARING BLOCK ON THE SURFACE OF A SOIL MASS COMPACTED INTO A MOLD EIGHT IN. IN DIAMETER AND FOUR IN. IN HEIGHT. THIS LOAD IS DESIGNATED AS THE "BEARING INDEX." THE ENERGY IN FOOT-POUNDS PER CU. IN. OF COMPACTED MATERIAL REQUIRED TO DEVELOP THE DESIRED STRENGTH MAY BE DETERMINED BY PLOTTING ENERGY AGAINST STRENGTH. /AUTHOR/

  • Supplemental Notes:
    • Vol 25, pp 96-101, 5 FIG, 4 TAB, 6 REF
  • Authors:
    • Campen, W H
    • Smith, J R
    • Nevitt, H G
  • Publication Date: 1946

Media Info

  • Monograph Title: Proceedings of the Twenty-Fifth Annual Meeting Held at Skirvin Hotel, Oklahoma City, Oklahoma, January 25-28, 1946
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00229979
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 22 1971 12:00AM