Bitumen

• PENETRATION GRADES
Penetration Grade Bitumen is a standard bitumen usually used as a Paving Grade Bitumen essential for road construction and for the production of asphalt pavements with superior properties, and it’s very important once it bounds the aggregates and creates a unique cohesion and stability to the bituminous mix.
This grade of Bitumen is mainly used in the manufacture of hot mix asphalt for bases and wearing courses.

• VISCOSITY GRADES
Based on viscosity BIS revised IS-73-1992 specifications (Viscosity at 60oC) there are four grades VG-10, VG-20, VG-30 & VG-40. A few qualification tests like specific gravity, water content, ductility, loss on heating & Farass breaking point were removed from IS:73-1992 as these tests do not have any relationship with the performance of the product.

• OXIDIZED BITUMEN
Oxidized Asphalt begins its life much like any other asphalt. It is taken from the bottom of a vacuum distillation unit in a refinery, however, blown asphalt is then taken through an additional oxidation processing step.
The temperature of the vacuum tower bottoms is maintained in the blowstill between 450°F and 500°F while air is blown into it. While this process is often called oxidation (resulting in oxidized Asphalt) there are more reactions going on during the air blowing process. Some of these reactions include dehydrogenation, condensation, polymerization and many others.

• CUTBACK BITUMEN

Cutback Bitumen (Liquid Bitumen) is Bitumen that is dissolved in a solvent. Typical solvents include Naphtha, gasoline and kerosene, white spirit etc. The type of solvent controls the curing time while the amount determines the viscosity of the Cutback Bitumen.

• EMULSION BITUMEN
Bitumen emulsion consists of three basic ingredients: bitumen, water, and an emulsifying agent. Based on specifications it may contain other additives, such as stabilizers, coating improvers, anti-strips, or break control agents. It is well known that water and asphalt will not mix, except under carefully controlled conditions using highly specialized equipment and chemical additives.

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