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Viscosity Grade (VG) bitumens

Viscosity Grade (VG) bitumens

Bitumens are divided into different categories based on the production method, compounds, and physical properties, such as penetration bitumen and PG and viscosity (VB) bitumens. In this section, we will review the Viscosity Grade Bitumens.

This type of bitumen is used to make Hot-mix Asphalt. It has more thermoplastic properties than other bitumens, so it is harder in cold weather and softer in warm weather. Nowadays some countries (used mostly in India) use this type of bitumen which is called viscosity Grade bitumen.

The viscosity bitumens are defined according to the ASTM standard D3381-09 and the AASHTO method M226-8.

Viscosity bitumens are classified, into VG-10, VG-30, and VG-40 categories based on the Viscosity test results.

Bitumen viscosity is an important and fundamental property of bitumen, which indicates how bitumen behaves at a specific temperature or a temperature range.

Absolute viscosity is introduced based on poise and Kinematic viscosity in terms of Centistokes (cSt).

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 respectively the road surface temperature (RST) in the summer and the asphalt mixing temperature.

VG-10 Bitumens

It is used in spraying applications such as surface dressing or cold weather conditions and is almost equivalent to the 85-100 bitumens.

VG-30 Bitumens

For use in Hot Mix Asphalt (HMA), it is approximately 60-70 bitumens.

VG-40 Bitumens

For use in asphalt mixtures and HMA, and are approximately 40-50 bitumens.

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