REACTIONS IN PORTLAND CEMENT-CLAY MIXTURES, PHASE 3

THE RESULTS ARE PRESENTED OF A LABORATORY STUDY ON THE CEMENT STABILIZATION OF THREE COMMONLY ENCOUNTERED VIRGINIA SOILS. THE REPORT PRESENTS THE RESULTS OF AN EXTENSIVE STUDY OF THE PHYSICAL, CHEMICAL AND MINERALOGICAL PROPERTIES OF THE THREE SOILS. THE REACTION BETWEEN THE THREE SOILS AND PORTLAND CEMENT WAS MONITORED USING UNCONFINED COMPRESSIVE STRENGTH, X-RAY DIFFRACTION, PETROGRAPHIC MICROSCOPE OBSERVATIONS AND CHEMICAL ANALYSIS OF ACID AND WATER LEACHATES FROM SOIL-CEMENT PASTES. SOME OF THE CONCLUSIONS DEVELOPED BY THE AUTHOR ARE AS FOLLOWS: (1) WHEN THE MAJOR CLAY MINERALS ARE CONSIDERED MONTMORILLONITIC SOILS SUFFERED THE GREATEST DETERIORATION FROM CEMENT TREATMENT, KAOLINITIC SOILS LESS AND ILLITIC SOILS LEAST, (2) IRON IN THE IREDELL SOIL APPEARED TO REACT OR DISSOLVE READILY WITH CEMENT, (3) THE AMOUNT OF CLAY PRESENT RATHER THAN THE TYPE OF CLAY APPEARED TO AFFECT THE SHORT TERM STRENGTH DEVELOPMENT, AND (4) THREE MECHANICSMS RESPONSIBLE FOR REACTION OF SOIL AND DETERIORATION OF SOIL CONSTITUENTS ARE OFFERED. THESE MECHANISMS ARE: (A) CALCIUM HYDROXIDE FROM HYDRATED CEMENT REACTS WITH CLAY MINERALS OR AMORPHOUS MATERIAL YIELDING CALCIUM COMPOUNDS OF SILICA, ALUMINA AND IRON; (B) SILICA, ALUMINA AND IRON DISSOLVED FROM SOIL CONSTITUENTS REACT WITH CALCIUM HYDROXIDE FORMING CALCIUM COMPOUNDS; AND (C) SILICA, ALUMINA AND IRON DISSOLVED FROM SOIL ARE PHYSICALLY ADSORBED ONTO PARTIALLY HYDRATED CEMENT GRAINS. /BPR/

  • Corporate Authors:

    Virginia Highway Research Council

    Charlottesville, VA  USA 

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  USA  20590
  • Authors:
    • Plaster, R W
  • Publication Date: 1966

Subject/Index Terms

Filing Info

  • Accession Number: 00230699
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Aug 15 2004 2:21AM