Class 170 bitumen is widely used in sprayed sealing and light asphalt applications to provide durability and fatigue resistance.
It is also used to manufacture cutback bitumens, bitumen emulsions and modified bitumens.
Applications Bitumen Class 170
C170 bitumen can be used for all standard spray sealing and lightly trafficked asphalt applications.
|Mixing Temperature||Holding time at Mixing Temperature||Medium term storage temperature||Medium term storage time||Maximum safe handling temperature|
|140-165°C||14 days||130-150°C||30 days||175°C|
|Spraying Temperature||Holding time at spraying temperature||Medium term storage temperature||Medium term storage time||Minimum pavement temperature|
|170-180°C||7 days||130-150°C||30 days||15°C|
During sealing operations, it is normal practice to add cutter oil to the bitumen to reduce binder viscosity to a level at which effective wetting and adhesion of the cover aggregate can take place.
The quantity of cutter oil added to the bitumen depends upon the pavement temperature, the daily traffic and the nominal size of the cover aggregate.
Basic cutting practice for Bitumen C170 bitumen should be as follows:
Parts cutter per 100 parts bitumen measured at 15°C
|Pavement Temperature (°C)||Traffic (veh/lane/day)||Nominal Aggregate Size: 10mm or greater||Nominal Aggregate Size: 7mm or less|
|15 to 20||low (<100) med (100 – 1500) high (>1500)||7-8 5-6 4||7-10 6-8 5-6|
|20 to 25||low med high||7-8 5-6 4||7-10 6-8 5-6|
|26 to 35||low med high||4-6 2-4 2-3||6-8 5-7 4-6|
|Viscosity at 60° C||Pa.s||AS 2341.2||170|
|Viscosity at 135° C||Pa.s||AS 2341.2||0.35|
|Pen at 25° C||dmm||AS 2341.12||min 62|
|Flashpoint||° C||AS 2341.14||min 250|
|Viscosity of residue at 60° C (% of original)||Pa.s||AS 2341.2||max 300|