Cutback bitumen is produced by the careful addition of controlled amounts of petroleum distillates, such as kerosene. The characteristics of cutback bitumen, including its type and quality, are significantly influenced by the choice and quantity of the solvent used in the formulation.

As the concentration of solvent increases, the viscosity of cutback bitumen also rises. This particular form of bitumen is advantageous in scenarios where access to heating equipment is limited, where high-temperature heating is not practical, or where safety considerations regarding workers and fire hazards are critical.

Moreover, cutback bitumen offers time-saving benefits across various applications, notably in road construction for surfacing and paving activities.

Cutback bitumen is categorized based on its viscosity grade, which encompasses three primary classifications:

A.Rapid-Curing (RC)

This category encompasses cutback bitumen that is dissolved in gasoline, facilitating rapid evaporation and swift deposition of the bitumen. RC cutbacks are further classified into RC70, RC250, RC800, and RC3000, with the numerical designations indicating the viscosity of the bitumen. To achieve enhanced dilution, naphtha may be blended with bitumen grades 80/100. Each type of cutback bitumen is designed to fulfill specific functionalities and applications, thereby catering to the diverse operational requirements within the construction industry.

B.Medium-Curing (MC)

Medium-Curing (MC) cutbacks are created through the dissolution of bitumen in kerosene, which exhibits a slower evaporation rate compared to gasoline. These cutbacks are classified into five distinct categories, with viscosities ranging from 3-4 to 6,000 centipoise at a temperature of 60 degrees Celsius. Typically, MC bitumen is formulated by dissolving 85/100 grade bitumen in kerosene.

C.Slow-Curing (SC)

Slow-Curing (SC) cutbacks are produced by dissolving bitumen in gasoil or fuel oil, or through the direct distillation of crude oil. Unlike Medium-Curing (MC) cutbacks, SC types do not evaporate under standard weather conditions; however, they experience gradual alterations in their molecular structure over time. This bitumen is formulated by dissolving 85/100-grade bitumen in a heavy solvent, such as gasoil or fuel oil, which enhances its durability and solidifies its composition. Examples of SC bitumen include classifications such as SC 70, SC 250, SC 800, and SC 3000.