VG Bitumen (Viscosity-Graded Bitumen)
VG Bitumen, or Viscosity-Graded Bitumen, is a type of bitumen classified based on its viscosity rather than penetration. This grading system focuses on the bitumen’s resistance to flow at a specific temperature, making it a more performance-based approach compared to the traditional penetration grading system. VG bitumen is widely used in road construction and other applications where consistent performance under varying temperatures and traffic conditions is critical.
Key Features of VG Bitumen:
- Grading System:
VG bitumen is classified based on its viscosity at 60°C (140°F), which is the temperature at which bitumen typically experiences the most stress under traffic loads. The viscosity is measured in Pascal-seconds (Pa.s) or poise (P).- Common grades include VG-10, VG-20, VG-30, VG-40, etc.
- The number in the grade (e.g., VG-30) represents the viscosity in poise multiplied by 100. For example, VG-30 has a viscosity of approximately 3000 poise at 60°C.
- Advantages Over Penetration-Graded Bitumen:
- Temperature Sensitivity: VG bitumen provides better performance across a wide range of temperatures, making it more suitable for varying climatic conditions.
- Traffic Load: It is designed to withstand heavy traffic loads, reducing rutting and deformation.
- Aging Resistance: VG bitumen has
