Bitumen Vg40

Specification & Application of Bitumen VG40

Bitumen VG40 is a grade of refinery bitumen obtained from the vacuum aeration of the distillation tower and divided according to their viscosity. Bitumen VG40 is used in high pressure areas such as intersections, near toll roads and truck parking lots instead of old bitumen with a permeability of 30/40. Due to the high viscosity of this type of bitumen, mixed hard bitumen can be produced to improve tensile strength and other problems related to higher temperatures and heavy traffic loads. VG40 bitumen is one of the types of bitumen classified according to viscosity. Viscosity is a fundamental property of bitumen that determines how the material behaves at a certain temperature or a temperature range.

Applications of bitumen VG 40

The most common use of this type of bitumen is in road construction, insulation, building construction and liquid bitumen production. In terms of application, Bitumen VG40 is more suitable for warmer climates. In the classification based on the viscosity of bitumens according to the value of absolute viscosity at 60°C or kinematic viscosity at 135°C, the classification and direction of each of them have been determined by specific technical standards. Absolute viscosity is expressed in poise and kinematic viscosity is expressed in centi-Stokes. Classification and characteristics of pure bitumen are reported in AASHTO-M226 and ASTM-D3381 standards.

VG viscosity class bitumens:

Bitumens are divided into different categories based on the production method, compositions and physical properties, such as penetration grade bitumen, PG bitumen and viscosity grade bitumen (VB). In this section, we will have an overview of Viscosity Grade Bitumen. This type of bitumen is mostly used in preparing hot asphalt. This type of bitumen has more thermoplastic properties than other bitumens, so it is harder in cold weather and softer in hot weather.


Classifition of bitumens:

Viscosity bitumens are classified into VG-10, VG-30, and VG-40 categories based on the results of the viscosity test. The viscosity of bitumen is an important and fundamental property of bitumen that determines how bitumen behaves at a certain temperature and with a temperature range. Absolute viscosity based on poise and kinematic viscosity are introduced in centistokes. 

The higher the temperature, the softer the bitumen. In this type of bitumen, the viscosity test is measured at 60 and 135 degrees Celsius, which is the temperature of the road surface in summer and the temperature of asphalt mixing, respectively.

  • Bitumen VG10

It is used for spraying on surfaces or in cold weather conditions and is almost equivalent to 85-100 bitumen.

  • Bitumen VG30

It is used in hot asphalt mixtures and is approximately equivalent to 60-70.

  • Bitumen VG40

It is used in asphalt mixtures and warm asphalt and they are approximately equivalent to 40-50.

Properties of bitumen VG40:

In the below table, we have shown some important properties of bitumen VG40:


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