Bituminous emulsion is a dispersion of bitumen in water containing an emulsifying agent. There are two types: anionic emulsions and cationic emulsions. The properties of emulsions are related to the adsorption theory which enables the breaking phenomenon (irreversible separation of bitumen and water) to be explained. By modifying the viscosity of the base bitumen, the concentration quantity and type of the emulsifying agent, it is possible to accelerate or retard breaking. Emulsions are used in the form of surface dressings. This type of application is nearly exclusively reserved for cationic emulsions which afford the following advantages: rapid breaking independent of hygrometry, excellent adhesion to aggregates, possibility of reaching high concentrations while retaining a satisfactory viscosity. Emulsions are also used for the manufacture of cold-coated bitumen macadam, semi-dense or dense for wearing courses. For several years the gravel/emulsion technique using mainly cationic emulsions has facilitated the application of thick layers for the strengthening of pavements or the construction of road bases and sub-bases. /TRRL/

  • Corporate Authors:

    Revue Generale des Routes

    9 rue Magellon
    Paris,   France 
  • Authors:
    • Arnaud, J
  • Publication Date: 1977-11


  • French

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Filing Info

  • Accession Number: 00300275
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 17 1979 12:00AM