Bitumen 50/70 is produced from the vacuum distillation of crude oil and is classified according to its penetration range. Bitumen 50/70 is a thermoplastic material which softens gradually as it is heated and hardens as it is cooled. This unique temperature/viscosity relationship is important when determining its performance parameters and application temperatures.

Unlike modified binders, penetration grade bitumen acts as a Newtonian fluid at high in-service temperatures, which allows one to establish a temperature/viscosity relationship.

50/70 Penetration Grade Bitumen is used in the manufacture of hot mix asphalt for base courses and wearing courses. Bitumen 50/70 fulfils the requirements for paving grade bitumen in accordance with EN 12591.

 

 

Key Features of Bitumen 35/50

 

Penetration Grade

Bitumen 50/70 has a penetration value between 50 and 70 mm at 25°C. This means it’s a medium-hard bitumen, which makes it suitable for moderate climates where the road surfaces do not experience extreme heat or cold.

 

Uses

Bitumen 50/70 is often used for the construction of flexible pavements. It is particularly suited for creating road layers such as surface dressing, asphaltic concrete, and hot mix asphalt. Its properties make it a good balance between flexibility and durability.

 

Temperature Susceptibility

Bitumen 50/70 has a moderate temperature susceptibility, meaning its viscosity changes with temperature. It softens when heated, making it easier to mix with aggregates and apply on roads, and hardens when cooled, providing strength and stability to the pavement.

 

Production and Quality

Bitumen 50/70 is produced through the distillation of crude oil, resulting in a refined bitumen product. Quality standards for this grade of bitumen are usually specified by national or international standards, ensuring consistency in its performance.