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Australian Bitumen Grades
Classes of Bitumen under the Australian Standard are determined by the Viscosity test at 60°C Pa.s.
Bitumen grades for Australian market are as below:
- Class 170
- Class 320
- Class 600
Bitumen Class is belonging to Australia Paving Grade and it is using in perforce roads in Oceania. These Classes is normally using in Spray Sealing and using in manufacturing of Modified Bitumen. Some of Bitumen Class like 170 is used in Cold and Bitumen Class 320 using in high temperature.
Bitumen Classes is producing as per Australian Standard based on AS2008. Storage and Temperature of keeping each Grade is different. Sparing temperature is between 175 to 185 for 5 days but mixing temperature is 140 to 170 for 10 days and storage is 120 to 140 for 30 days.
Australian Bitumen Grades
The following classes are most commonly used in sprayed sealing works in Australia:
- Class 170: the most commonly used class for sprayed sealing
- Class 240: higher viscosity binder (compared to C170) used by some road agencies in warm climates
- Class 320: higher viscosity binder (compared to C170 and C240) sometimes used for sprayed sealing in areas where pavement temperatures or traffic stresses were high, but has been largely superseded by PMBs and multigrade bitumen.
- 180/200 penetration: generally used in sprayed seal work (the approximate equivalent of Class 50 bitumen which was a softer class of bitumen than Class 170 used in Australia in the past).
- 130/150 penetration: a slightly harder grade used as an alternative to 180/200 (approximate viscosity between that of Class 50 and Class 170 bitumen).
- 80/100 penetration: generally only used in sprayed seals in hotter areas or when resealing fatty or bleeding seals (the approximate equivalent of Class 170 bitumen).