Bitumen Emulsion Plant

WHAT IS MODIFIED BITUMEN

Roads are the 'lifeline' of the modern world. In order to withstand harsh environment and heavy traffic conditions their construction and maintenance require flexible and economical materials.Hot bitumen is mixed with aggregates, fillers and additives to create a range of surfaces suited for their individual requirements. In asphalt production bitumen plays a key role. The properties of paving bitumen and bituminous mixes can be improved by addition of certain additives or blends of additives. These additives are called “Bitumen Modifiers” and the bitumen premixed with these modifiers is known as “Modified Bitumen”.

WHY USE BITUMEN EMULSIONS?

Standard flexible road structures consists of layers of manufactured materials laid onto an roadbed soil. The upper portion of the roadbed soil is commonly exposed to harsh environmental and heavy traffic leading to distortion and subsequent cracking of the upper surface layers. It is not economically viable to excavate the complete structure and therefor emulsion mixes are used successfully to follow roadbed soil movement without cracking. It has been proven that emulsion mixes have membrane-like mechanical properties rather than the slab-like properties of standard hot bituminous mixtures. Furthermore, emulsion mixes are not as susceptible to thermal cracking as regular standard hot bituminous mixtures.

PRINCIPALS OF EMULSIONS MIXES

An emulsion is a mixture of two immiscible liquids, one of which is dispersed in the other in the form of very fine particles. The process of emulsification is accomplished by use of an emulsifier and a stabilizer.

Emulsion mixes are used as a base layer in a pavement structure as well as a surfacing course. They are obtained by dispersing a cationic bitumen emulsion in an aggregate and can be produced in cold mix plants as well as with mix-pavers. The application rates vary from 50 mm to 200 mm in thickness.

The binder within an emulsion stabilized granular material selectively coats smaller particles. The stiffness of emulsion mixtures is lower than Hot Mix Asphalt. Unlike Hot Mix Asphalt, the manufacturing of emulsion mixes does not require heat.

The surface of emulsion mixes is relatively fragile when compared to the surface of Hot Mix Asphalt. Unsealed emulsion mixes do not provide waterproofing and the cohesion at the surface may not be sufficient to withstand surface tangent stresses. By sealing the surface emulsion mixes, waterproofing is achieved and the inherent performance of emulsion mixes is not compromised by premature stripping, oxidation and raveling.

Use As Per Setting Characteristics

• Rapid Setting (RS) : Used in surface dressing and patch repair work.
• Medium Setting (MS) : Used in pre-mix with less quantity of fine aggregates and pothole repair works.
• Slow Setting (SS) : Used in premix with appreciable quantity of fine aggregates such as slurry seal and fog seal.
  

Cutback Bitumen

Are used for cold weather construction as well as maintenance under all weather conditions. The petroleum distillate generally used for obtaining cut back bitumen is kerosene.

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