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Rapid curing cutback bitumen is produced by blending bitumen with
kerosene
benzene
petrol
diesel
petrol
Rapid curing (RC) cutback bitumen is produced by blending asphalt cement with highly volatile petroleum distillates, primarily gasoline (petrol) ┬╖ The high volatility allows for rapid evaporation, leaving the bitumen to bind the aggregates quickly after application.
Rapid curing (RC) cutback bitumen is produced by blending asphalt cement with highly volatile petroleum distillates, primarily gasoline (petrol) ┬╖ The high volatility allows for rapid evaporation, leaving the bitumen to bind the aggregates quickly after application.
VmixtureтАЛ=VbitumenтАЛ+VsolventтАЛ тАФ representing the volume balance
╬╖mixтАЛ<╬╖bitumenтАЛ тАФ indicating that the cutback viscosity is lower than the parent bitumen
The viscosity of bitumen is reduced by the addition of a solvent (flux oil) to make it fluid at ambient temperatures for easy spraying ┬╖ Once applied to the pavement, the volatile solvent evaporates, and the bitumen returns to its original hard state, providing high bonding strength.
Cutback bitumen types are classified based on the rate of curing: Rapid (RC), Medium (MC), and Slow (SC).
RC cutbacks use highly volatile solvents (gasoline/petrol).
MC cutbacks use medium volatility solvents (kerosene).
SC cutbacks use low volatility solvents (diesel or light oils).
Does not require heating for application
Rapid setting properties suitable for surface dressing
Presence of volatile solvents is a fire hazard
Environmental concern due to VOC emissions
Surface dressing
Tack coating
Patching work
The curing rate is inversely proportional to the boiling point of the solvent used.
Option A (kerosene) is used for Medium Curing (MC).
Option D (diesel) is used for Slow Curing (SC).
C is correct тАФ Rapid curing cutback bitumen uses petrol as a solvent due to its high volatility and fast evaporation rate.
Remember the mnemonic: RC-Petrol (Rapid), MC-Kerosene (Medium), SC-Diesel/Gas oil (Slow) ┬╖ This is a high-yield question in Highway Engineering exams.