EFFECT OF SODIUM CHLORIDE TREATMENT ON THE ENGINEERING PROPERTIES OF COMPACTED EARTH MATERIALS

SAMPLES OF TWENTY-THREE EARTH MATERIALS WERE OBTAINED TO PROVIDE A WIDE VARIETY OF MECHANICAL AND PHYSICO-CHEMICAL PROPERTIES. COMPACTED MATERIALS WERE SUBJECTED TO SEVEN DIFFERENT CURING PROCEDURES IN ORDER TO COVER MOST OF THE POSSIBILITIES OF ENVIRONMENTAL INFLUENCE WITH REGARD TO MOISTURE THAT WOULD BE UNDERGONE BY MATERIALS IN PRACTICE. COMPACTED CYLINDERS OF MATERIALS WERE PREPARED WITH AND WITHOUT SODIUM CHLORIDE TREATMENT FOR COMPARISON AND THE BENEFIT OF TREATMENT WAS ASSESSED IN TERMS OF THE COMPARATIVE STRENGTH OF TREATED AND UNTREATED MATERIAL FOR EACH MATERIAL AND CURING PROCEDURE. IT WAS FOUND THAT SODIUM CHLORIDE TREATMENT IS MOST BENEFICIAL TO MOST MATERIALS IF A CURING PROCEDURE PERMITTING DRYING IS USED ALSO NOTED THAT METAHALLOYSITE IS CONVERTED TO KAOLINITE BY COMPARATIVE BENEFITS WERE SEEN WHERE MATERIALS WERE ALLOWED TO DRY FOR 14 DAYS FOLLOWING COMPACTION AND WERE THEN SOAKED FOR FOUR DAYS AND TESTED. MATERIALS WHICH WERE FOUND TO RESPOND WELL TO SODIUM CHLORIDE TREATMENT INCLUDED: (1) GRANULAR MATERIALS WITH FINES OF UNWEATHERED ROCK DUST; (2) FINE-GRAINED RED SOILS OF WARM HUMID AREAS WHICH UNDERGO A LARGE REDUCTION IN PLASTIC LIMIT; (3) UNWEATHERED CALCAREOUS LOESS; (4) KAOLINITIC CLAY; AND (5) LATERITE. FOR THE FOREGOING MATERIALS, IT WAS ESSENTIAL THAT CURING INCLUDED DRYING. SOME RESPONSE TO SODIUM CHLORIDE TREATMENT WITHOUT DRYING DURING CURING WAS NOTED FOR FINE-GRAINED CALCAREOUS MATERIALS. MATERIALS WHICH DID NOT RESPOND WELL TO TREATMENT INCLUDED: (1) GRANULAR MATERIALS WITH AN ABUNDANCE OF FINES OF CLAY AND WEATHERING PRODUCTS; (2) COAL STRIP MINE WASTE; (3) WEATHERED LOESS; AND (4) DARK TOPSOIL. MOST SIGNIFICANT PROPERTIES OF EARTH MATERIALS APPEAR TO BE GRADATION AND WHETHER OR NOT THE MATERIAL IS CALCAREOUS. IN SOME CASES, ATTERBERG LIMITS, CALCIUM-MAGNESIUM RATIO AND AVAILABILITY OF SILICA ALSO PROVIDE INDICATION OF RESPONSE. NO OUTSTANDING "MECHANISMS" EXPLAINING SODIUM CHLORIDE STABILIZATION WERE FIRMLY ESTABLISHED IN THE INVESTIGATION. HOWEVER, IT WAS FOUND THAT SILICA AND ALUMINA ARE MADE AVAILABLE TO SOLUTION BY SOME EARTH MATERIALS WHEN SODIUM CHLORIDE IS PRESENTED AND THAT DRYING OF SODIUM CHLORIDE TREATED MATERIALS TENDS TO INHIBIT RELEASE OF THESE OXIDES TO LATER SOLUTION. IT WAS ALSO NOTED THAT METHALLOYSITE IS CONVERTED TO KAOLINITE BY SODIUM CHLORIDE TREATMENT.

  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Urbana, IL  United States  61801
  • Authors:
    • Moore, J C
  • Publication Date: 1973

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 213 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00233450
  • Record Type: Publication
  • Report/Paper Numbers: Thesis
  • Files: TRIS
  • Created Date: Apr 20 1974 12:00AM