This type is produced according to customers’ request, Pavements designed and constructed for heavy duty traffic and extreme weather conditions require specially designed engineered Bitumen Grades. changing the characteristics of original bitumen with change of process condition or/and the addition of some modifier such as Polymer, Rubber
B. Penetration grade
Bitumen production in according to three standard method (Blowing method ,Straight run method and Blending method) in Iran and other countries
The Air Blowing Bitumen is produced by process of vacuum Bottom (VB) and air in the reactor. and due to the control of the process conditions, different grades are produced.
Bitumen clasification according to various specification such as Penetration, Viscosity, Performane of bitumen in the road.
C.Emulsion grade
Bitumen emulsions are basically an O/W – Oil on Water solution – A dispersion of bitumen particles on water phase, stabilized with the addition of surfactants – Surface active agents – or most commonly known as emulsifiers. They are primarily used for tack coats for use in between hot mix asphalt layers and prime coats for thin hot mix surfacing layers or a chip seal pavements, other cold mixed asphalt and maintenance binder .
Bitumen emulsions are divided into three categories:
* Anionic with negatively charged globules
* Cationic with positively charged globules
* Non-ionic with neutral globules.
Base on the time of setting after spraying, Bitumen emulsions classification as Quick Set (QS), Rapild set (RS), Medium set (MS) and Slow set(SS)
d. Cutback liquid grade
Cutback Bitumen is by adding controlled amounts of petroleum solvent such as Kerosene, Gasole and Gasoline.
Base on reduce of bitumen viscosity for spraying in ambient temperature for several application such as Asphalt Pavement Construction, Maintenance,Prime and Tack Coating Base on the time of curing after spraying, Cutback bitumen classification as Rapild Curing(RC), Medium Curing (MC) and Slow Curing (SC)