Iran bitumen
The beginning of the modern bitumen industry can be attributed to 1712 AD.
At that time, bitumen materials were simply spread in lumps on the surface of local roads, allowing traffic to gradually erode and condense them.
This technique was quite successful, and in a short period of time progress was made in this field, including spraying and heating the material before use.
The asphalts were then compacted and hardened by pounding and leveling with hot iron. This material is commonly known as Compressed Rock Asphalt ......
And in 2020
It is a hydrocarbon compound with dark brown-black color, in solid, semicircular or viscous forms, with adhesive properties that are of natural or refined origin, mainly containing high molecular weight hydrocarbons.
These materials are completely soluble in carbon disulfide (CS2), trichloroethylene (C2HCl3) and xylene (C6H4 (CH3) 2). Its vapor pressure is negligible at ambient temperature and in this case is almost odorless.
The most abundant and widely used type of bitumen is petroleum bitumen, which is a physically homogeneous substance and a chemically heterogeneous mixture of different chemical compounds.
This hydrocarbon mixture generally contains 90% of carbon and hydrogen atoms and residues, nitrogen, sulfur and oxygen and small amounts of nickel, iron, magnesium and .....
Bitumen is behaviorally a substance that does not behave like an elastic substance or a viscous substance at ambient temperature, but the behavior of bitumen includes a combination of these two states, ie viscoelastic.
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