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Cutback bitumen is simply a combination of asphalt cement and petroleum solvent. Like emulsions, cutbacks are used because they reduce asphalt viscosity for lower temperature uses (tack coats, fog seals, slurry seals, stabilization material).
Bitumen is ‘cutback’ by adding controlled amounts of petroleum distillates such as kerosene. This is done to reduce the viscosity of the bitumen temporarily so it can penetrate pavements more effectively or to allow spraying at temperatures that are too cold for successful sprayed sealing with neat bitumen.
The materials used to cutback bitumen will evaporate after application to leave the remaining material similar in hardness to the original bitumen.
Tehranpasargad Bitumen cutbacks are manufactured to comply with the requirements of Australian Standard AS 2157 Cutback bitumen.