Bitumen Viscosity Grade (Asphalt) is a typical grade of Bitumen. It is generally used as a paving grade bitumen which is appropriate for the construction of roads and for the asphalt pavements production with better properties. This grade of Bitumen is primarily used in the production of hot mix asphalt for bases and wearing courses, and possesses features and attributes that unique sand is quite different from other agents. They attain very flexible relations with other materials.
Uses of Viscosity Grade
There are different grades of bitumen viscosity like:
- VG10 BITUMEN:
It is commonly used by spraying applications for example surface-dressing and paving in very cold climate condition. It is also used in the production of the Bitumen Emulsion and other Bitumen products.
- VG20 BITUMEN:
It is used for paving in cold climate condition and high altitude areas.
- VG30 BITUMEN:
It is mostly used in the construction of extra heavy duty Bitumen pavements that need to undergo extensive traffic loads.
- VG40 BITUMEN:
It is used in extremely stressed areas for example crossroads, near toll booths and truck parking. Since it’s higher in viscosity, stiffer or hard mixes of Bitumen can be manufactured to improve resistance to shoving and many other issues related with higher temperature and heavy traffic loads.
The grading system of viscosity gave excellent performance outcomes in the US and around the world for over twenty years. The viscosity grading system is more logical than the penetration grading system.
Types of Viscosity Grade
- Standard Viscosity Grade:
In this method the standard bitumen Viscosity (asphalt) is measured at 60ºC.
- Viscosity Grade Bitumen:
In this method the bitumen Viscosity (asphalt) is measured at 60 °C after the thin film oven test through rolling.Viscosity grades Bitumen are classified according to Viscosity or the degree of fluidity grading. The higher the grade will be, the stiffer will be the Bitumen. Viscosity tests are conducted in viscosity grade, and the temperature is 60°C and 135°C, which actually suggests the temperature of road surface throughout the summer and mixing temperature respectively.