EFFECT OF SULFATES ON CEMENT- AND LIME-STABILIZED SOILS

THE RESULTS OF A LABORATORY INVESTIGATION MADE TO DETERMINE THE EFFECT OF THE PRESENCE OF SULFATE IONS IN SOILS ON THE DURABILITY OF CEMENT- AND LIME-STABILIZED SOILS ARE DESCRIBED. THE METHOD OF INVESTIGATION CONSISTED OF OBSERVING THE BEHAVIOR OF SPECIMENS OF STABILIZED SOIL WHEN TOTALLY IMMERSED IN WATER. WHEN TESTED IN THIS WAY CEMENT- OR LIME-STABILIZED CLAY MIXTURES CONTAINING CALCIUM, MAGNESIUM, OR SODIUM SULFATES DISINTEGRATED WITHIN A FEW DAYS OF BEING IMMERSED, WHEREAS CEMENT-STABILIZED SAND MIXTURES CONTAINING THE SAME PROPORTIONS OF SULFATE WERE UNAFFECTED EVEN AFTER BEING IMMERSED FOR ONE YEAR. THIS SUGGESTED THAT THE EFFECT WAS RELATED TO THE CLAY CONTENT OF THE SOIL, AND DIFFERENTIAL THERMAL ANALYSIS AND X-RAY ANALYSIS SHOWED THAT, AT THE HIGH PH VALUES ENCOUNTERED IN CEMENT AND LIME-STABILIZED SOILS, A REACTION OCCURS BETWEEN THE CLAY FRACTION AND ANY SULFATES PRESENT. IT IS PROPOSED THAT SULFATE ATTACK ON CEMENT-STABILIZED SOILS IS DUE PRINCIPALLY TO THIS REACTION AND THAT THE RELATIVELY SLOW COMBINATION OF THE SULFATES WITH THE CEMENT IS OF SECONDARY IMPORTANCE. THIS EXPLAINS WHY LIME-STABILIZED CLAY SOILS ARE SIMILARY AFFECTED BY THE PRESENCE OF SULFATES AND ALSO WHY THE SEVERITY OF THE ACTION OF SULFATES CANNOT BE REDUCED BY USING SULFATE-RESISTANT CEMENT IN PLACE OF ORDINARY PORTLAND CEMENT. IT IS CONCLUDED THAT UNDER CERTAIN CONDITIONS SULFATES PRESENT IN A CEMENT- OR LIME-STABILIZED SOIL CAN LEAD TO ITS DISINTEGRATION. THESE CONDITIONS ARE MOST LIKELY TO OCCUR WHEN THE SOIL CONTAINS AN APPRECIABLE CLAY FRACTION AND WHEN THE MOISTURE CONTENT OF THE SOIL IS LIABLE TO INCREASE ABOVE THAT AT WHICH IT WAS COMPACTED. BECAUSE UNDER OTHER CIRCUMSTANCES SULFATES MAY APPEAR TO HAVE A BENEFICIAL EFFECT, IT IS SUGGESTED THAT IS IS INADVISABLE TO MAKE USE OF THESE BENEFICIAL EFFECTS UNLESS ALL POSSIBILITY OF DELETERIOUS EFFECTS ON THE DURABILITY OF THE MATERIAL CAN BE EXCLUDED. /AUTHOR/

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  • Authors:
    • SHERWOOD, P T
  • Conference:
  • Publication Date: 1962

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 98-107
  • Monograph Title: Stabilization of soils with Portland cement
  • Serial:

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Filing Info

  • Accession Number: 00237469
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 3 1994 12:00AM