VG-40 bitumen is a high-viscosity grade, which means it is thicker and stickier compared to VG-10 and VG-30. It is typically used in the construction of high-traffic roads, highways, airports, and other heavy-duty applications where superior durability and resistance to deformation are required.VG-40 bitumen is commonly used as a binder in the production of hot mix asphalt (HMA) for high-stress pavement surfaces.

The choice of the bitumen grade depends on factors such as the traffic volume, climatic conditions, and the specific requirements of the road construction project. Higher viscosity bitumen like VG-40 are preferred for areas with heavy traffic loads to ensure the longevity and stability of the road surface, while lower viscosity bitumen like VG-10 may be used for less demanding applications.

It's important to note that the properties and specifications of bitumen can vary from one region to another, and different countries may have their own grading systems or standards for bitumen. Therefore, it's essential to consult local guidelines and specifications when selecting the appropriate bitumen grade for a specific construction project.