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iran Bitumen

Bitumen Types:

Penetration Grade Bitumen

Penetration Grade Bitumen is a standard bitumen usually used as a Paving Grade Bitumen essential for road construction and some industrial applications.

The penetration grading system was developed in the early 1900s to characterize the consistency of semi-solid asphalts. Penetration rate bitumen is graded based on penetration and softening point tests. Bitumen with lower penetration grade is used in the regions with warm climate while higher penetration grade is used for cold climates.

SEBCO supplies Penetration Grade Bitumen in grades 60/70 ,80/100 ,85/100 & 40/50 . These grades can be supplied in different packages including bulk,Bags and Drums (JEY Embossed Drums,Pasargad Embossed Drums,SEBCO Embossed Drums and Non-Embossed Drums).

Viscosity Grade Bitumen

With the increased use of designed dense mixes,increased traffic volume and loading,higher road users’ expectations and changes in crude quality,new test method was felt essential lately. Hence new standards such as absolute viscosity at 60°C and 135°C were developed.

Bitumen is graded based on absolute viscosity at 60ºC or kinematic viscosity at 135ºC. The SI physical unit of dynamic viscosity is Poise and kinematic viscosity is expressed in Centi Stokes. Pure bitumen has been graded based on AASHTO-M226 and ASTM-D3381 standards.

According to viscosity (degree of fluidity) grading,higher the grade,stiffer the Bitumen. Tests are conducted at 60˚C and 135˚C,which represent the temperature of road surface during summer (hot climate) and mixing temperature respectively.

SEBCO supplies Viscosity Grade Bitumen in grades VG10 ,VG30 & VG40 . These grades can be supplied in different packages including bulk and Drums (JEY Embossed Drums,Pasargad Embossed Drums,SEBCO Embossed Drums and Non-Embossed Drums).

Performance Grade Bitumen:

Performance Grade bitumen (PG) is graded based on its performance at different temperatures. In Super pave grading system,binders are classified according to their performance in extreme hot and cold temperatures and called as performance grading (PG) bitumen. The main purpose of grading and selecting asphalt binder using the PG system is to make certain that the binder has the appropriate properties for environmental conditions in the field. PG asphalt binders are selected to meet expected climatic conditions as well as traffic speed and volume adjustments. It is one of the most important changes introduced in Super pave that acceptance limits are the same but have to be met at specific pavement temperature and traffic conditions.

The Long-Term Pavement Performance has given a certain algorithm to calculate the temperature of the pavement based on the temperature of the air above. From this,the highest and the lowest temperatures of the pavement are calculated and the bitumen that performs well in that temperature range is selected. A wider PG range means higher resistance and more favorable specifications.

SEBCO supplies different grades of Performance Grade Bitumen which can be supplied in different packages including bulk and Drums (JEY Embossed Drums,Pasargad Embossed Drums,SEBCO Embossed Drums and Non-Embossed Drums).

Cut Back Bitumen:

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.

Cutback bitumen is used when there is limited access to heating equipment and bitumen may be cooled throughout working. This type of bitumen is used in road operations for surfacing and pavement.

Cutback bitumen is classified based on viscosity grade and it is divided into three categories:

Rapid-Curing (RC):The cutback bitumen is known as rapid-curing (RC) if the bitumen is solved in Gasoline. The reason is that evaporation occurs quickly and the bitumen is deposited.

Medium-Curing (MC):MC cutbacks are prepared by solving bitumen in Kerosene which evaporates more slowly than gasoline.

Slow-Curing (SC):Slow-curing cutback may be achieved from solving bitumen in Gasoil or Fuel oil or directly from distillation of crude oil.

SEBCO supplies different grades of Cut Back Bitumen.