DISCUSSION OF AGING EFFECTS ON SWELL POTENTIAL OF COMPACTED CLAYS

IN DAVIS' VIEW THE AUTHORS' CONCLUSION THAT THE EXPANSIVE CLAYS SHOULD BE COMPACTED DRY OF OPTIMUM WHEN GIVEN ENOUGH TIME FOR AGING MAY BE APPLICABLE FOR LOW DENSITIES, AS THEIR RESULTS INDICATE, BUT THE HIGHER DENSITY SAMPLES COMPACTED BY THE MODIFIED AASHO PROCEDURE INDICATE THAT SWELL POTENTIAL IS SIGNIFICANTLY AFFECTED BY INITIAL MOISTURE CONTENT. A PLOT MADE BY DAVIS OF SWELL VERSUS MOISTURE CONTENT FOR DIFFERENT AGING PERIODS SHOWS A DECREASING FREE SWELL PERCENTAGE WITH INCREASING MOISTURE FOR ALL AGING PERIODS UP TO 90 DAYS. FROM THE RESULTS IT WOULD SEEM ADVISABLE TO COMPACT EXPANSIVE CLAYS ON THE WET SIDE OF OPTIMUM. ZOLKOV CONSIDERS THAT THE AUTHORS' STATEMENT, "IF THE CLAY IS GIVEN ENOUGH TIME FOR AGING, FOR THE SAME DENSITY THE AMOUNT OF SWELL IS INDEPENDANT OF MOISTURE CONTENT," IS FAR REACHING AND DIFFICULT TO ACCEPT UNLESS QUALIFIED BY THE RESERVATION: FOR THE RANGE OF INITIAL MOISTURE CONTENTS AND RELATIVELY LOW DENSITIES CHECKED. HE ALSO SUGGESTS CONSIDERATIONS THAT MIGHT ADD TO A CLARIFICATION OF THE AUTHORS QUESTIONS. FINALLY, HE IS CONCERNED WITH THE VARIATIONS WITHIN THE SAMPLES BECAUSE WHILE A REFERENCE IS MADE TO DENSITIES AND MOISTURE CONTENTS WHICH ARE ARITHMETIC AVERAGES, THE RELATIONSHIPS INVESTIGATED ARE CERTAINLY NOT LINEAR.

  • Supplemental Notes:
    • Vol 97, No SM 9, PP 1348-1350
  • Authors:
    • Davis, R C
  • Discussers:
    • Zolkov, E
  • Publication Date: 1971-9

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Filing Info

  • Accession Number: 00236286
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 20 1971 12:00AM