Asphalt is a dark brown complex mixture, which consists of hydrocarbons with different molecular weights and their nonmetallic derivatives. It is an organic liquid with high viscosity. It is a liquid with a black surface and is soluble in carbon disulfide.
Asphalt is mainly divided into three types: coal tar asphalt, petroleum asphalt and natural asphalt. Petroleum asphalt is the residue of crude oil distillation, while natural asphalt is stored underground, and some of it forms joints or accumulates on the crust surface.
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In civil engineering, asphalt is a widely used waterproof and anticorrosive material, which is mainly used for waterproofing of roofs, floors and underground structures, and anticorrosion of wood and steel.
Asphalt is also a widely used pavement structure cementing material in road engineering. After being matched with mineral materials with different components in proportion, it can be used to build asphalt pavements with different structures and is widely used in expressways.
As early as 1200 years ago, people began to use natural asphalt as decorations in the production of weapons and tools.