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Dec 19, 2017

                                   Asphalt is a complex black-brown mixture composed of different molecular weight hydrocarbons and their non-metallic derivatives, which is a kind of high viscosity organic liquid, is liquid, and has a black surface, which can dissolve in carbon. Bitumen is a kind of organic cementitious material which is waterproof, moistureproof and anti-corrosion. Asphalt can be divided into three kinds of coal tar pitch, petroleum asphalt and natural asphalt: coal tar pitch is a by-product of coking. Petroleum bitumen is the residue after distillation of crude oil. Natural bitumen is stored underground, some form a seam or accumulate on the surface of the crust.