Petroleum Bitumen is one of the major outputs of oil refining. It has many uses: repairs of roads and airfields, road construction, civil and industrial construction (roofing materials, piping production, production of paint etc). Of the above, road construction is where bitumen is used most extensively.
The cover of roads and airfields made with this binding material are stronger and safer, as well as 2 to 2.5 times less expensive than similar layers made of bitumen.
The following types of bitumen are available:
- viscous road construction;
- special purpose.
To use oil as a material for bitumen production, it must contain a certain composition of resins, paraffins and asphaltenes. The deposits of such oil are not unlimited, which prompts the use of other types of oil. This, in many cases, reduces the quality of the binding material.
Durability of road layers is mostly defined by the quality of bitumen. Therefore, the materials used for road construction, must meet certain requirements:
- good adhesion to the mineral filler surface;
- wide plasticity range;
- improved low temperature performance.
Using low quality bitumen in road construction leads to premature wear of the road top layer, increasing the costs of repairs. Beside, durability of automobile roads is reduced in 2-2.5 times.