Asphalt can be divided into coal tar asphalt, asphalt and natural asphalt three 
kinds: First, coal tar pitch: coal tar pitch is a byproduct of coking, there is 
no obvious boundaries, the general division method is to specify the softening 
point at 26.7 ℃ (cubic method) for the following tar, 26.7 ℃ above the asphalt. 
Coal tar pitch mainly contains volatile anthracene, phenanthrene, pyrene and so 
on. These substances are toxic, because the content of these components are 
different, so the nature is different. The change of temperature has great 
influence on coal tar pitch, which is easy to brittle in winter and easy to 
soften in summer. Heating with a special smell; heated to 260 ℃ in 5 hours 
later, it contains anthracene, phenanthrene, pyrene and other ingredients will 
be 
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Second, the oil asphalt: oil asphalt is the residue after distillation of crude 
oil. According to the degree of extraction of different, at room temperature 
into a liquid, semi-solid or solid. Oil asphalt black, asphalt road and thus 
shiny, with a high temperature. Because it is in the production process has 
been distilled to 400 ℃ or more, and thus contains very little volatile 
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Third, natural asphalt: natural asphalt stored in the ground, and some of the 
formation of ore or in the crustal surface accumulation. Most of this asphalt 
through natural evaporation, oxidation, generally does not contain any toxins. 
Under normal circumstances, asphalt material is divided into asphalt and tar 
asphalt two categories. Asphalt is divided into natural asphalt and petroleum 
asphalt, natural asphalt is the oil exudation surface after long-term exposure 
and evaporation of the residue; after the appropriate process to deal with the 
product. Tar asphalt is coal, wood and other organic dry distillation 
processing of the tar after re-processing products. Most of the asphalt used in 
the project is petroleum asphalt, and petroleum asphalt is a mixture of complex 
hydrocarbons and their nonmetallic derivatives. Usually the asphalt flash point 
between 240 ℃ ~ 330 ℃, the ignition point than the flash point of about 3 ℃ ~ 6 
℃, so the construction temperature should be controlled below the flash 
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