FLY ASH AND SODIUM CARBONATE AS ADDITIVES TO SOIL-CEMENT MIXTURES

ALTHOUGH THE USE OF FLY ASH IN MASS CONCRETE AND IN LIME STABILIZATION HAS BEEN EXTENSIVELY INVESTIGATED, THERE HAS BEEN RELATIVELY LITTLE WORK DONE ON ITS USE IN SOIL-CEMENT STABILIZATION. APPARENTLY THERE IS NO PUBLISHED MATERIAL AVAILABLE ON THE USE OF SODIUM CARBONATE IN SOIL-CEMENT-FLY ASH MIXTURES. THREE SOILS (A DUNE SAND, A FRIABLE LOESS, AND AN ARTIFICIAL SAND-LOESS MIXTURE) WERE STUDIED. THREE FLY ASHES FROM THREE DIFFERENT SOURCES WERE USED. THE CEMENT WAS TYPE I AND THE SODIUM CARBONATE WAS REAGENT GRADE. IT WAS FOUND THAT FLY ASH COULD BE USED AS AN ADDITIVE TO, OR AS A REPLACEMENT FOR, CEMENT IN FRIABLE SOIL-CEMENT MIXTURES. THE SMALLER THE LOSS ON IGNITION AND THE FINER THE PARTICLE SIZE OF THE FLY ASH, THE MORE USEFUL IT IS AS AN ADDITIVE OR REPLACEMENT. HOWEVER, THESE CRITERIA ARE NOT IN THEMSELVES SUFFICIENT TO FULLY DIFFERENTIATE BETWEEN THE VARYING QUALITIES OF THE FLY ASHES. FOR EACH FLY ASH THERE APPEARS TO BE AN OPTIMUM RATIO OF CEMENT TO FLY ASH. THE ADVANTAGES OF FLY ASH ARE MAINLY REFLECTED IN LONG-TERM STRENGTHS. THE ADDITION OF FLY ASH TENDS TO RETARD THE SETTING-UP OF SOIL- CEMENT MIXTURES, THUS ALLOWING MORE TIME FOR MIXING AND COMPACTING. THE BENEFICIAL EFFECTS OF THE ADDITION OF SODIUM CARBONATE ARE MOST NOTICEABLE AFTER SHORT CURING PERIODS. SODIUM CARBONATE CAN BE DETRIMENTAL OVER A LONG PERIOD OF TIME TO SOIL-CEMENT AND SOIL-CEMENT-FLY ASH MIXTURES CONTAINING LOW CEMENT CONTENTS. /AUTHOR/

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  • Authors:
    • O'Flaherty, Coleman A
    • Mateos, Manuel
    • Davidson, Donald T
  • Conference:
  • Publication Date: 1962

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 108-123
  • Monograph Title: Stabilization of soils with Portland cement
  • Serial:

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Filing Info

  • Accession Number: 00237468
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 3 1994 12:00AM