PHOSPHORIC ACID STABILIZATION OF FINE-GRAINED SOILS: IMPROVEMENTS WITH SECONDARY ADDITIVES

SEVERAL TECHNIQUES FOR IMPROVING, OR REDUCING THE COST, OF PHOSPHORIC ACID STABILIZATION OF A CLAYEY SILT AND A HEAVY CLAY HAVE BEEN EXAMINED. WITH THE CLAYEY SILT, TREATMENT WITH MIXTURES OF CALCIUM PHOSPHATE, OR PULVERIZED FLORIDA PHOSPHATE ROCK, AND SULFURIC ACID YIELDS HUMID CURE STRENGTHS GREATER THAN WITH THE EQUIVALENT AMOUNT OF PHOSPHORIC ACID, BUT LOWER IMMERSED STRENGTHS. USING PHOSPHATE ROCK, HOWEVER, THE REDUCTION IN COST OF STABILIZATION IS SO GREAT THAT HIGHER CONCENTRATIONS OF THIS MIXTURE CAN BE USED TO PRODUCE SATISFACTORY STABILIZATION AT A COST COMPETITIVE WITH CONVENTIONAL STABILIZERS. GRANULAR, ORTHORHOMBIC PHOSPHORUS PENTOXIDE CAN BE USED TO STABILIZE CLAYEY SILT AS EFFECTIVELY AS PHOSPHORIC ACID OR ORDINARY PHOSPHORIC OXIDE, AND WITH POTENTIALLY GREATER FIELD- CONVENIENCE. TRACE AMOUNTS (0.1 PERCENT OF SOIL) OF THIS COMPOUND FUNCTION AS AN EXCELLENT SOIL-DISPERSANT, AND WHEN USED IN CONJUNCTION WITH PHOSPHORIC ACID OR PHOSPHATE ROCK- SULFURIC MIXTURES, GREATLY INCREASE COMPACTED DENSITY AND STRENGTH. FERRIC CHORIDE, AT 1.6 PERCENT ON SOIL, IS AS EFFECTIVE A WATERPROOFER FOR PHOSPHORIC-ACID-STABILIZED HEAVY CLAY AS 0.5 PERCENT OCTYLAMINE. ALTHOUGH THIS SUBSTITUTION BRINGS ABOUT A SUBSTANTIAL REDUCTION IN STABILIZATION COST, THE MATERIALS COSTS FOR VERY HEAVY CLAY STABILIZATION ARE STILL TOO HIGH TO BE ATTRACTIVE FOR ALL BUT EMERGENCY SITUATIONS. DEVELOPMENT OF AN INEXPENSIVE, HIGHLY EFFECTIVE WATERPROOFER MAY BROADEN THE USEFULNESS OF PHOSPHORIC ACID IN SUCH SOILS. /AUTHOR/

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    • No 282, pp 28-37, 2 FIG, 7 TAB, 6 REF Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
  • Authors:
    • Michaels, Alan S
    • Tausch Jr, Frederick W
  • Conference:
  • Publication Date: 1961

Language

  • English

Media Info

  • Monograph Title: Influence of stabilizers on properties of soils and soil- aggregate mixtures
  • Serial:

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  • Accession Number: 00232396
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:43AM