Viscosity Grade Bitumen (Asphalt)

Description

Viscosity Grade Bitumen (Asphalt) is a standard grade Bitumen usually used as a Paving Grade Bitumen suitable for road construction and for the production of asphalt pavements with superior properties. This grade of Bitumen is mainly used in the manufacture of hot mix asphalt for bases and wearing courses and possesses characteristics and qualities unique and quite different from other agents. They achieve very flexible and tenacious connections with other materials due mainly to the viscoelastic response of bitumen, whose behavior depends on how fast charges are applied.

Viscosity Grade Bitumen supplied by Rosalind Group is petroleum-grade bitumen, manufactured from a fractional / vacuum distillation of crude oil, which practical appliance and behavior varies according to its temperature.

Viscosity Grade bitumen is specified by the methods described in ASTM Standard D3381-09 and AASHTO M226-80 (2008). Viscosity Graded specifications cover bitumen (asphalt) graded by Viscosity at 60 C (140 °F).

There are two methods of grading:º

• Standard Viscosity Grade Bitumen (AC-Grades), in which the Viscosity of the standard bitumen (asphalt) is measured at 60 ºC (140 ºF).
• RTFOT Viscosity Grade Bitumen (AR-Grades), in which the Viscosity of bitumen (asphalt) is measured at 60 °C (140 °F) after the roll-on thin film oven test.

Viscosity grade bitumen has a thermoplastic property which causes the material to soften at high temperatures and to harden at lower temperatures. This unique temperature/ viscosity relationship is important when determining the performance parameters such as the adhesion, rheology, durability, and application temperatures of bitumen. In the Viscosity Graded Bitumen specifications, special emphasis is placed on the Bitumen ductility.

Standard Viscosity Grade Bitumen Binders include:

• Viscosity Grade Bitumen AC-2.5
• Viscosity Grade Bitumen AC-5
• Viscosity Grade Bitumen AC-10
• Viscosity Grade Bitumen AC-20
• Viscosity Grade Bitumen AC-30
• Viscosity Grade Bitumen AC-40

RTFOT Viscosity Grade Bitumen Binders include:

• Viscosity Grade Bitumen AR-1000
• Viscosity Grade Bitumen AR-2000
• Viscosity Grade Bitumen AR-4000
• Viscosity Grade Bitumen AR-8000
• Viscosity Grade Bitumen AR-16000