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 When a volatile material is added to bitumen for changing its viscosity, the final product is called 

 When a volatile material is added to bitumen for changing its viscosity, the final product is called  Correct Answer <span style="text-indent: -48px; white-space: pre-wrap;">Cutback</span>

Concept:

1) Cut back: Cutback bitumen is obtained by blending bitumen binder with suitable volatile diluents in required proportion to reduce its viscosity. Cutback bitumen is used in surface dressing, soil bitumen stabilization, etc.

2) Bitumen: It is a petroleum product obtained by distillation of petroleum crude. Bitumen is used binding material in pavement construction.

3) Asphalt: It is the bitumen containing inert material like alumina, silica etc. It is used in pavement construction to provide void lesser surface.

4) Tar: It is the viscous liquid obtained from natural organic material like wood and coal by subjecting them to destructive distillation in the absence of air.

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