The three indexes of 1. asphalt are penetration, elongation and softening point. Penetration reflects the viscosity of petroleum asphalt and can also be used as a label index. The softening point reflects its high temperature, and the higher the softening point, the better. Elongation is its plasticity index.

2. 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 a waterproof, moisture-proof and anticorrosive organic cementing material. Asphalt is mainly divided into three types: coal tar asphalt, petroleum asphalt and natural asphalt.

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