Penetration bitumen

bitumen grade 20/30, 40/50, 60/70, 60/90, 85/100

The penetration grade bitumen is refinery bitumen which is produced by different viscosity. In fact, Penetration bitumen is semi hard black material known as petroleum grade bitumen. The penetration test is carried out to characterize the bitumen, based on the hardness. Therefore, it has the name penetration bitumen. The common bitumen penetration grades are 60/70, 80/100, 85/100, 40/50 and 30/40; which normally Low penetration grade bitumen is used in the warm areas while high penetration grade is used in cold areas. The major Penetration Grade Bitumen is Bitumen 60/70 that is generally used for all the markets.

Actually, Penetration Grade Bitumen is specified by the penetration and softening point test. The designation is by penetration range only.

Penetration grade basic assumption is that the less viscous asphalt, the needle will penetrate deeper. This penetration depth is empirically (albeit only roughly) correlated with asphalt binder performance. Therefore, asphalt binders with high penetration numbers (called “soft”) are used for cold climates while asphalt binders with low penetration numbers (called “hard”) are used for warm climates. Just as an example to make it more clear, Bitumen 60/70, means penetration is between 60 dm (Decimeter) to 70 dm, that's mean needle will penetrate to bitumen sample minimum 60 dm and maximum 70 dm.

BS group produce this grade of bitumen by blowing hot air into the high quality vacuum bottom. This grade of Bitumen is mainly used in the manufacture of hot mix asphalt for bases and wearing courses.

The penetration grading system was developed in the early 1900s to characterize the consistency of semi-solid asphalts. Penetration grading quantifies the following asphalt concrete characteristics:

  • Penetration depth of a 100 g needle 25° C (77° F).
  • Flashpoint temperature. Ductility at 25°C (77°F).
  • Solubility in trichloroethylene.
  • Thin film oven test (accounts for the effects of short-term aging that occurs during mixing with hot aggregate).
  • Retained penetration.
  • Ductility at 25° C (77° F)

In the following you could check BS group penetration bitumen specifications:

 

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