Oxidized bitumen is produced by blowing hot air with temperatures of 200 to 300 degrees Celsius into the reactor of the refinery’s BBUs, in order to obtain penetration grade bitumen. In comparison with pure bitumen, this product has a lower penetration grade and a higher melting point. A low, medium or hard oxidized bitumen is classified according to its softening point and penetration grade.
As bitumen is heated in the reactor, oxygen atoms of air react with hydrogen atoms of bitumen. As a result, some steam is generated which should be removed from the oxidation chamber. Therefore, the Oxidized bitumen remains.
There are various grades of oxidized bitumen.
75/25, 75/30, 85/25, 85/40, 95/25, 90/40
115/15, 110/15, 105/5, 105/15, 105/35 and 150/5
Oxidized bitumen is used in many industries such as road construction, hydropower, roofing, flooring, masonry, oil and gas, and electrical applications.
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Among oxidized bitumen’s main benefits are the following:
Oxidized Bitumen is used primarily as a sealant for undercarriages in the automobile industry as part of anti-slip compounds. Besides being used in manufacturing roofing felts and sound dampening felts, it is also used as a sealant compound and as a joint filler compound.
By using the Continuous Blowing Process or Staggered Blowing Process, Oxidized Bitumen is produced. It is blown with air in the Chimney/Tower to heat Penetration Grade Bitumen up to 300 degrees Celsius. By oxidizing the bitumen, the oil content in it is removed.
By blowing air to pure bitumen, oxidized bitumen is produced. Therefore oxidized bitumen is also called blown bitumen. The penetration grade is lower than pure bitumen, and its softening point is higher.
Bitumen emulsions are classified into three types, slow setting (SS), medium setting (MS), and rapid setting (RS). The type of emulsifying agent determines the level of stability. At ambient temperature, it can be sprayed or mixed with aggregates for road construction, and it will start to bind right away.