Bitumen 60/70

Bitumen 60/70 is a standard penetration grade bitumen usually used as a paving grade bitumen suitable to be used in producing hot mix asphalt for road construction and production of asphalt pavements with superior properties as per following technical specification.

Analysis Unit Limit Test Method
Density@25˚C Kg/m3 1010-1060 ASTM D7 or D3289
Penetration@25˚C mm/10 60-70 ASTM D5
Softening Point ˚C 46 Min ASTM D36
Ductility@25˚C cm 100 min ASTM D113
Loss on heating Wt% 0.2 Max ASTM D6
Drop in Penetration after heating % 20 Max ASTM D5
Flash Point ˚C 232 Min ASTM D92
Solubility in Trichloroethylene Wt% 99.0 Min ASTM D2042
Spot Test Negative AASHTO T102
Viscosity@60˚C P 2000±400 ASTM D2171
Viscosity@135˚C cSt 300 Min ASTM D2170

Definition of bitumen penetration grade 60/70

Bitumen penetration grade 60/70 means the penetration value is in the range 60 to 70 at standard test conditions which commonly used as a Paving Grade. Bitumen is applicable for the production of hot mix asphalt for bases and pavements and for road construction. Penetration Grade Bitumen supplied by Iranbitumen Co. This bitumen is produced through aeration on vacuum bottom (the raw material used for making bitumen left in vacuum distillation column in oil refineries) in bitumen production units. Its penetration grade ( the measure of bitumen hardness) is between 60 to 70. Bitumen is specified by the penetration and softening point test. Designing is by penetration range only. The penetration grade bitumen has a thermoplastic property which causes the material to soften at high temperatures and to harden at lower temperatures. This unique temperature-viscosity relationship is important when determining the performance parameters such as the adhesion, rheology, durability and application temperatures of bitumen.

The Bitumen mode is dependent on temperature. The temperature-vs-stiffness relationship of bitumen is dependent on the type of crude oil and its refining method. Bitumen penetration grade 60/70 is semi-hard penetration grade bitumen used as a paving grade bitumen which is suitable for road construction and repair. It is also used for the production of asphalt pavements with the below technical specification. This grade of bitumen is mainly used in the manufacturing of hot mix asphalt for bases and wearing courses. Bitumen 60/70 is one of the most used bitumen grades and it’s a basic material for all other bituminous products.

Application of bitumen penetration grade 60/70

Bitumen 60/70 is suitable for road construction and for the asphalt pavements with superior properties. This type of bitumen used in the manufacture of hot mix asphalt for bases and wearing courses and the main usage of this product is used in the road in mild regions. The bitumen is provided during the presses of oxidation of vacuum bottom in bitumen production units. Due to its medium air blowing and penetration, it is used in mild areas.

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