EFFECTS OF REMOLDING ON THE PROPERTIES OF A LATERITIC SOIL

LABORATORY STUDY OF A PANAMANIAN LATERITIC SOIL SHOWS THAT REMOLDING OR WORKING BY MECHANICAL AGENTS ALTERS THE SOIL'S PHYSICAL PROPERTIES AND STRENGTH PARAMETERS. RESULTS OF GRAIN SIZE ANALYSIS AND ATTERBERG LIMITS TESTS INDICATED THAT WORKING CAUSES A BREAKDOWN OF ITS GRANULAR STRUCTURE AND AN INCREASE IN ITS PLASTICITY. THE EFFICACY OF VARIOUS STABILIZING ADDITIVES USING BOTH WORKED AND UNWORKED SOIL SAMPLES WAS INVESTIGATED. RESULTS INDICATED THAT STABILIZATION IS INFLUENCED TO A CONSIDERABLE EXTENT BY THE AMOUNT OF MECHANICAL WORKING. PORTLAND CEMENT WAS THE MOST EFFECTIVE OF THE THREE ADDITIVES TESTED AND YIELDED HIGHER UNCONFINED COMPRESSIVE STRENGTHS WITH THE UNWORKED SOIL. LIME WAS ALSO AN EFFECTIVE STABILIZER, BUT REACTED MORE FAVORABLY WITH THE SOIL IN THE WORKED CONDITION. THE PRIMARY BENEFIT DERIVED FROM ASPHALTIC STABILIZATION WAS WATERPROOFING RATHER THAN SUBSTANTIAL STRENGTH GAINS. AN EVALUATION OF THE TEST RESULTS LED TO THE POSTULATION THAT A SUBSTANTIAL PORTION OF THE CLAY PARTICLES HAS BEEN COATED WITH IRON AND ALUMINUM OXIDE (SESQUIOXIDE) FILMS, AND THAT WORKING BY MECHANICAL AGENTS CAUSES A BREAKDOWN OF THIS COATING ALLOWING THE CLAY PARTICLES TO BEHAVE IN A MORE CHARACTERISTIC FASHION. NEW OR REVISED LABORATORY TESTING TECHNIQUES ARE NEEDED FOR THIS TYPE OF SOIL. /AUTHOR/

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 76-84
  • Monograph Title: Laboratory and field soil tests; lateritic soils
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00229730
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:39AM