What should be poured on the water-stable surface before asphalt paving?

One is viscous reservoir and the other is permeable reservoir.

Some roads will be sealed and the water-stable layer will be sprayed with asphalt concrete. This layer of asphalt will penetrate into the water-stable layer, so that the middle asphalt can be better combined with the water-stable layer. A thick oil layer should be sprayed between coarse-grained asphalt concrete and surface asphalt concrete, and the asphalt surface layer can be made only after demulsification, so that the middle asphalt and surface asphalt can be better integrated.

The lower seal coat is a new technology. In rainy and humid areas, the porosity of asphalt surface layer of expressway and first-class highway is large, which may cause serious water seepage, or when the paving base can not pave the asphalt surface layer in time and vehicles need to pass, it is advisable to spray the oil layer first and then pave the lower seal layer. The difference between the lower seal coat and the prime coat oil: the purpose of the lower seal coat is to seal the surface, which does not necessarily require penetration; Permeable reservoirs need to penetrate to a certain depth.

The function of seal coat:

First, seal a certain layer to keep water and water.

Secondly, it plays the role of transition and effective connection between base course and asphalt surface course.

The third is the reinforcement of the loose part of a certain pavement.

Fourth, before paving the asphalt pavement at the grass-roots level, traffic should be temporarily opened to prevent the grass-roots level from being damaged by water due to weather or vehicles. Seal coat can be divided into upper seal coat and lower seal coat.