iran high quality bitumen
Petroleum bitumen is produced by refining crude oil at high temperatures and in a short time.
It is liquid at high temperatures and becomes viscous, pasty, and hard as the heat decreases. Excessive heating of the bitumen causes excessive evaporation of its mineral oils and reduces the adhesion of the bitumen.
Waxed bitumen is not suitable for making black surface because wax reduces the elasticity of bitumen and causes black surface to lose its springy state and become brittle.
The black surface shrinks in the cold and tensile stress is found in it. When this stress is greater than the tolerance of the frozen asphalt surface, the surface cracks.
The less petroleum paraffin, the closer it is to mineral bitumen and the more suitable it is for making the surface.
In addition to paraffin, asphaltene, oxygen and mineral oils also affect the quality of bitumen. The heavier the crude oil, the more asphalt is extracted from it.
Basically, light crude oil is less used for bitumen production due to the production of high-distillation materials, although bitumen production is related to various other parameters, which generally include refining knowledge and technology issues and economic issues.
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