FINE-GRAINED SOIL STABILIZATION WITH PHOSPHORIC ACID AND SECONDARY ADDITIVES

THE EFFECTIVENESS OF PHOSPHORIC ACID AS A STABILIZER FOR TWO FINE-GRAINED SOILS (A CLAYEY SILT AND A HEAVY CLAY) HAS BEEN STUDIED, WITH PARTICULAR EMPHASIS ON THE USE OF FLUORINE COMPOUNDS AS CURE ACCELERATORS AND OF AMINES AS WATERPROOFERS. THE CLAYEY SILT (P.I. = 6.0) COULD BE SUCCESSFULLY STABILIZED WITH PHOSPHORIC ACID ALONE, AT CONCENTRATIONS OF 2 PERCENT ACID ON DRY SOIL WEIGHT, AND HIGHER. WITH 2 PERCENT ACID, WET STRENGTH AFTER 24-HR HUMID CURE WAS 120 PSI: THIS WAS INCREASED TO 220 PSI BY ADDITION OF 0.5 PERCENT SODIUM FLUOSILICATE. WITH 5 PERCENT ACID AND 0.5 PERCENT FLUOSILICATE, WET STRENGTH OF NEARLY 500 PSI WAS ACHIEVED UNDER SIMILAR CONDITIONS. CLAYEY SILT TREATED WITH ACID AND FLUOSILICATE DISINTEGRATES IF IMMERSED IN WATER IMMEDIATELY AFTER COMPACTION, ADDITION OF ONLY 0.05 PERCENT (ON SOIL) OF OCTYLAMINE HOWEVER, ALLOWS STRENGTH TO DEVELOP UNDER THESE CONDITIONS. THE HEAVY CLAY (P.I. = 32.2) COULD NOT BE SUCCESSFULLY STABILIZED WITH PHOSPHORIC ACID ALONE. INCORPORATION OF OCTYLAMINE WITH PHOSPHORIC ACID RESULTED IN UNUSUALLY EFFECTIVE STABILIZATION OF THIS SOIL. WET STRENGTH OF 189 PSI AFTER 24-HR HUMID CURE WAS OBTAINED WITH 2 PERCENT ACID AND 2 PERCENT OCTYLAMINE, AND 268 PSI WITH 5 PERCENT ACID AND 1 PERCENT AMINE. FLUORINE COMPOUNDS HAD NO SIGNIFICANT EFFECT WITH THIS SOIL. WITH 2 PERCENT ACID AND 2 PERCENT AMINE, SATISFACTORY STRENGTH (143 PSI) DEVELOPMENT WAS OBSERVED EVEN WHEN THE TREATED SOIL WAS IMMERSED IN WATER IMMEDIATELY AFTER COMPACTION. THESE AND EARLIER RESULTS INDICATE THAT PHOSPHORIC ACID, WITH ADDED FLUORINE COMPOUNDS AND/OR AMINES, OFFERS CONSIDERABLE PROMISE FOR LOW -COST STABILIZATION OF FINE-GRAINED, CARBONATE-FREE SOILS UNDER FIELD CONDITIONS. /AUTHOR/

Language

  • English

Media Info

  • Monograph Title: Soil stabilization with asphalt, Portland cement, lime and chemicals
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00231334
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:41AM