EXPLORATORY RESEARCH IN BITUMINOUS SOIL STABILIZATION

THE MECHANICS OF ASPHALTIC SOIL STABILIZATION ARE DISCUSSED BASED UPON THE MAJOR FOUR FACTORS FOR ANY GIVEN SOIL MATERIAL: (1) SOIL STATUS, (2) ASPHALTIC MATERIAL, (3) MIXING, AND (4) COMPACTION AND CURING. A METHOD OF BITUMINOUS STABILIZATION OF SOILS IS PRESENTED AS RELATED TO SOILS DEVELOPING APPRECIABLE DEGREES OF COHESIVENESS WHEN MOIST AND WHICH MAY BE STABILIZED BY THE PRINCIPLE OF WATERPROOFING. THIS METHOD IS BASED UPON THE THEORY THAT SOIL, WATER, AND BITUMINOUS MATERIAL, INCLUDING ASPHALT, MAY BE PLACED IN SUCH INDEPENDENT RELATIVE POSITIONS WITHIN A COMPACTED MASS OF MIXTURE SO THAT A DEFINITE SYSTEM EXISTS OR TENDS TO PREDOMINATE. THE SYSTEM CONSISTS ESSENTIALLY OF SOIL-WATER MIXTURES WHICH ARE WATERPROOFED BY BITUMINOUS FILMS HELD OR ABSORBED ON THEIR SURFACES. STABILIZATION BY WATERPROOFING MAY BE ACCOMPLISHED WITH: (1) RELATIVELY SMALL QUANTITIES OF BITUMEN, (2) A MINIMUM OF MIXER WORK AND TIME, (3) UTILIZATION OF THE ECONOMIES ACCRUING FROM INTERMEDIATE SOIL MOISTURE CONTENTS DURING MIXING AND COMPACTION, AND (4) THE MORE COMPLETE UTILIZATION OF SOILS IN SITU DUE TO THE GREATER RANGE OF SOILS WHICH MAY BE SUCCESSFULLY TREATED. THE BITUMINOUS STABILIZATION OF SOIL UTILIZING SUPPLEMENTARY ADMIXTURES WAS INVESTIGATED BY THE USE OF PORTLAND CEMENT, LIME, AND AQUEOUS SOLUTIONS OF CERTAIN HEAVY METAL SALTS. DATA PRESENTED INDICATE THAT STABILIZATION OF SOIL WITH MATERIALS AS CEMENT, CONSIST OF TWO SEPARABLE AND DISTINGUISHABLE FUNCTIONS, ONE AN ALTERATION OF SOIL CHARACTER REDUCING THE SENSITIVENESS OF THE SOIL TO PHYSICAL CHANGES INDUCED BY WATER, THE OTHER A CEMENTATION OF THE ALTERED PARTICLES OF SOIL INTO A WATER- TIGHT COHERENT MASS. THE FIRST FUNCTION MAY BE PRODUCED BY SMALL QUANTITIES OF CEMENT, AND THE SECOND BY BITUMEN, YIELDING A DUAL OR COMPOSITE FORM OF STABILIZATION POSSESSING HIGH STRENGTH, FLEXIBILITY, AND HIGH IMMUNITY TO ACTION OF WATER AND TEMPERATURE. THESE PRINCIPLES WERE APPLIED IN TWO PROCESSES, ONE A PRE-TREATMENT OF SOIL WITH CEMENT WHICH INCLUDED MIXING, WETTING, CURING, AND REPULVERIZATION, WHILE THE OTHER METHOD CONSISTED OF MIXING, IN CONSECUTIVE ORDER, THE MATERIALS SOIL, CEMENT, WATER, AND BITUMEN, FORMING A MIXTURE CAPABLE OF BEING IMMEDIATELY LAID AND COMPACTED. THE EFFECT OF DIFFERENT TYPES OF CEMENT UPON THE CHANGES INDUCED IN SOIL WERE DISCUSSED. THE CHARACTER OF THE REACTIONS INDUCED IN SOIL BY BOTH CEMENT AND LIME WERE DISCUSSED. THE EFFICIENCY OF LIME AS AN ADMIXTURE MATERIAL FOR BITUMINOUS STABILIZATION WAS STUDIED. THE ECONOMIC PRACTICALITY OF THE USE OF CEMENT AND LIME AS BITUMINOUS STABILIZATION ADJUNCTS WAS DISCUSSED WITH ATTENTION TO THE METHOD OF SOIL DILUTION BY AGGREGATE AS AN ALTERNATIVE.

Media Info

  • Serial:
    • Issue Number: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00231427
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 15 2004 2:41AM