SURFACE CHEMICAL ASPECTS OF THE BOND FORMATION BETWEEN BITUMINOUS MATERIALS AND MINERAL SURFACES

THE SURFACE PROPERTIES OF SOILS AND MINERALS AS WELL AS THE PHYSICO-CHEMICAL PROPERTIES OF THE PRINCIPLE CONSTITUENT GROUPS OF THE BITUMENS ARE PRESENTED. THE MANIFESTATION OF THE SURFACE PROPERTIES OF A CERTAIN SYSTEM IS A FUNCTION OF THE AMOUNT AND CHARACTER OF SURFACE PRESENT. THE PHYSICO- CHEMICAL CHARACTER OF A CERTAIN SURFACE IS A FUNCTION OF THE CHEMICAL COMPOSITION AND OF THE GEOMETRICAL STRUCTURE OF THE SURFACE LAYERS. THE SURFACE PROPERTIES OF SOILS HAVE BEEN FOUND TO BE FUNCTIONS OF THEIR SILICA-SESQUIOXIDE RATIO AND OF THE AMOUNT AND KIND OF ADSORPED IONS. THE BOND FORMATION BETWEEN BITUMINOUS MATERIALS AND THE SURFACE OF A SOIL PARTICLE IS A FUNCTION OF THE AMOUNT AND CHARACTER OF THE POLAR PARTICLES PRESENT IN THE BITUMENS. THE ESTABLISHMENT OF A SATISFACTORY BOND BETWEEN A MINERAL SURFACE AND BITUMINOUS MATERIAL CAN BE ACCOMPLISHED BY USE OF THE FOLLOWING DIFFERENT METHODS: (1) MIXING OF THE MINERAL AGGREGATE AND THE BITUMEN AT ELEVATED TEMPERATURES, (2) CHANGING SURFACE CHARACTER BY EXCHANGE ADSORPTION WITH MORE SUITABLE IONS OR BY PRECOATING WITH MOLECULES WITH DUAL CHARACTER LIKE THOSE OF SOAPS, NAPTHENIC ACIDS, AND (3) USE OF THE ORIENTING INFLUENCE OF WATER ON THE CHARACTER OF THE BITUMINOUS INTERFACE, EITHER BY SPECIFYING A CERTAIN MOISTURE CONTENT OF THE MINERAL MATTER OR BY THE USE OF EMULSIONS.

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Filing Info

  • Accession Number: 00210925
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 21 1994 12:00AM