Let us pay yours attention to very special wax to modify bitumen - Sasobit®.
Sasobit® and paraffins which are naturally found in bitumen are not comparable just because normally paraffins have just 22-45 carbon atoms chain, while Sasobit® carbon atoms chain is much longer 40 - 115 atoms.
Why Sasobit® is so special and how it works?
Sasobit® - singnificantly improves workability of the mix and it's compactibility.
This product melts at temperature 85-115° C and reduce neat or polymer modified bitumen's viscosity at higher temperature range.
Moreover - Sasobit® additionally improves mechanical properties of the mix (asphalt layer), so it becomes more resistant to rutting formation.
We have to bear in mind, that Sasobit® does not change bitumen's Fraas point, so it remains the same as before modification.
Sasobit® melts and mix well with the bitumen at 140° C.
Here below is some data about influence Sasobit® does to bitumen 50/70 and 70/100:
|B 50/70||SmB 35||B 70/100||SmB 45|
|Bitumen content, %||100||97||100||97|
|Sasobit® content, %||-||3||-||3|
|Bitumen softening temperature (R&B), °C||48-54||75-85||43-49||70-80|
|Penetration at 25°C (1/10 mm)||50-70||30-50||70-100||35-55|
|Bitumen Fraas temperature, °C||- 8||- 8||- 10||- 10|
Recommended Sasobit® dose - 3% from bitumen weight.