Although spreading salt on the pavement has solved the traffic problem, it has also brought some impacts on the environment. Please name one of them.

The method of spraying salt to melt snow is very serious to the road itself and the environment. The service life of roads without sodium salt treatment will be shortened by more than half after melting snow with sodium salt.

Sprinkling salt and melting snow will corrode concrete pavement and bridge structure, resulting in cracks, peeling, steel bar exposure and corrosion. Salt water will also accelerate the aging of urban roads, such as cracking and boiling; The green vegetation on both sides of the road will also be destroyed, and the car chassis polluted by salt water will also be corroded. Salt water has high salt content and high expansion number during freezing, which has a high degree of damage to roads. For bridges, these are all strong corrosive agents, which will directly lead to rust or even fracture of steel bars on the bridge.

According to British statistics, the funds needed to repair the bridge damage caused by snow melting agent are about 1.6 times of the construction funds. Therefore, for the current development direction of projects focusing on environmental protection and conservation-oriented city construction, the late problems brought by salt melting are very serious.

Finding a better snow melting agent will become a good research project. I think at present, we should try to reduce the use of snow melting agent and increase manual snow sweeping. Although this will consume manpower and reduce efficiency, it is one of the most environmentally friendly methods at present.