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What are the types of asphalt?

The types of asphalt are:

1. Natural asphalt: natural asphalt is stored underground, and some form ore beds or accumulate on the surface of the earth's crust. This kind of asphalt mostly passes through natural evaporation and oxidation, and generally does not contain any toxin.

2. Coal tar pitch: coal tar pitch is a by-product of coking, that is, the black matter remaining in the distillation kettle after tar distillation. The change of temperature has a great impact on coal tar pitch. It is easy to crack in winter and soften in summer.

3. Petroleum asphalt: petroleum asphalt is the residue of crude oil distillation. It becomes liquid, semi-solid or solid at room temperature according to the degree of refining.


Extended data:
1. Asphalt is a hydrophobic material. It is impermeable, almost insoluble in water, acetone, ether and dilute ethanol, and soluble in carbon disulfide, carbon tetrachloride and sodium hydroxide.
2. Asphalt pavement is one of the most widely used high-grade pavement in road construction. The asphalt structural layer of asphalt pavement itself belongs to the category of flexible pavement, but its base can also use rigid cement concrete or semi-rigid hydraulic materials in addition to flexible materials.
3. As asphalt pavement material, asphalt concrete should bear the repeated action of vehicle load and the long-term influence of environmental factors.
4. Various construction of asphalt pavement, including longitudinal joints, transverse joints and joints of new and old roads, are often prone to quality accidents such as steps, cracks and looseness due to insufficient compaction, affecting the flatness and durability of the pavement.


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