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Bitumen Emulsion

USD 450 / 450 Ton ( Approx )
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  • Min. Order (MOQ) 100 Metric Ton
  • Type Liquid Type
  • Brand Name VMF
  • Color BLACK
  • Name Emulsions
  • Place of Origin MIDDLE EAST

Bitumen emulsions are usually dispersions of minute droplets of bitumen in water and are examples of oil-in-water emulsions. The bitumen content can be varied to suit different requirements and is typically between 30% and 70%. The primary objective of emulsifying bitumen is to obtain a product that can be used without the heating normally required when using cutbacks and paving grade bitumen. In the manufacture of bitumen emulsions, hot bitumen is sheared rapidly in water containing an emulsifying chemical (emulsifier). This produces very small particles of bitumen (the dispersed phase) dispersed in water (the continuous phase). The bitumen particles are stabilised in suspension and do not readily coalesce due to the presence of the emulsifier, which is concentrated on the surface of the bitumen particles. During application, the water in a bitumen emulsion is either lost by evaporation, or it may separate from the bitumen because of the chemical nature of the surface to which the emulsion is applied. This process is referred to as breaking. Because bitumen has a density only slightly higher than water, sedimentation of the bitumen droplets in an emulsion during storage is very slow. Emulsions can usually be regenerated after long storage times by gentle stirring to re-disperse the bitumen droplets. TYPES OF BITUMEN EMULSIONS Bitumen emulsions are available in many different forms, either cationic or anionic, with varying breaking or setting rates and binder types and contents. The two most common basic emulsion types are designated by the letter 'C' for cationic emulsions, as in CRS (cationic rapid setting), and by the letter 'A' in anionic emulsions, as in ASS (anionic slow setting). CATIONIC BITUMEN EMULSION When the emulsion is being produced the cations are adsorbed by bitumen droplets, negatively ions remain in the water. The undeniably most complete field of use is represented by the rapid setting emulsions. ANIONIC BITUMEN EMULSION Most often, fatty acid and resin acid alkaline salts are used. They are obtained by saponification of the liquid resin, called Tall-Oil. This substance is a residual, distilled substance, a by-product of the paper pulp industry from resinous wood treated using the “sulfate” process. The Co2Na group is the hydrophilic polar part. When in a solution in the continuous aqueous phase, the soap molecules become ionized; the Na (or K) ions are the cations adsorbed by the water and the rest of the molecules are the anions adsorbed by the bitumen globules. The characteristics of an emulsion are designated by the terms rapid (R), medium (M) and slow (S).  The main grades for bitumen emulsions are classified as follows:

    Grade CRS-1 CRS-2 CMS-2 CSS-1 CSS-1h
    Min Max Min Max Min Max Min Max Min Max
    Viscosity, SayboltFurol at 25°C SFS             200 100 20 100
    Viscosity, SayboltFurol at 50°C 20 100 100 400 50 450        
    Storage stability test, 24-h, %B   1   1   1   1   1
    Demulsibility, 35 mL, 0.8% dioctyl sodium sulfosuccinate,% 40 ... 40 ...            
    Coating ability and water resistance:
    Coating, dry aggregate 
    Coating, after spraying 
    Coating, wet aggregate
    Coating, after spraying         fair        
    Particle charge test positive positive positive positive positive
    Sieve test,%B   0.1   0.1   0.1   0.1   0.1
    Cement mixing test,%                    
    Oil distillate, by volume of emulsion,%   3   3   12        
    Residue,% 60   65   65   57   57  
    Tests on residue from distillation test:
    Penetration, 25°C, 100g, 5s 100 250 100 250 100 250 100 250 40 90
    Ductility, 25°C, 5 cm/min, cm 40   40   40   40   40  
    Solubility in trichloroethylene, % 97.5   97.5   97.5   97.5   97.5

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