Don't know what is "permeable layer, adhesive layer, and sealing layer? Or don't know the "permeable layer, adhesive layer, and sealing layer construction sequence" please look over here and read this article carefully!
Let's talk about the construction sequence first. The permeable layer oil must be sprayed within 6 hours after the base layer is rolled. The permeable layer oil uses emulsified asphalt PC-2. The amount can be determined by trial spraying at 1.5 liters per square meter, and the penetration depth is not less than 5mm. After spraying the permeable layer oil, the emulsified asphalt PC-1 lower sealing layer is paved. The amount of emulsified asphalt is 1.0 liters per square meter, the aggregate particle size is 0.5 to 1cm, and the thickness should not be less than 0.6 cm. Before paving asphalt concrete, the adhesive layer oil must be sprayed on the upper and lower layers of the lower sealing layer and on the sides of structures such as curbs, rainwater outlets, and inspection wells. The adhesive layer oil uses emulsified asphalt PC-3, and the amount is per square meter. 0.5 liters.
Permeable layer: The function of the permeable layer is to make the asphalt surface layer and the non-asphalt material base layer bond well. It is a thin layer that penetrates the surface of the base layer by pouring emulsified asphalt, coal tar or liquid asphalt on the base layer.

The situations where permeable asphalt should be poured are as follows:
(1) Graded gravel and graded crushed stone base of asphalt pavement;
(2) Cement, lime, fly ash and other inorganic binders stabilized soil;
(3) Permeable asphalt must be poured on the semi-rigid base of granular material.
Adhesive layer: The function of the adhesive layer is to make the upper and lower asphalt structure layers or the asphalt structure layer and the structure (or cement concrete pavement) completely bonded into a whole.
The situations where adhesive asphalt should be poured are as follows:
(1) The asphalt layer below the double-layer or three-layer hot-mix hot-paved asphalt mixture pavement has been contaminated before the upper layer is paved.
(2) An asphalt layer is added to the old asphalt pavement layer. or bridge Before paving.
(3) Paving asphalt surface layer on cement concrete pavement,
(4) Sides of curbstones, rainwater inlets, inspection wells, etc. that are in contact with the newly laid asphalt mixture.
Sealing layer: The role of sealing layer:
(1) Sealing a certain layer to play a role in water retention and waterproofing;
(2) Serving as a transition and effective connection between the base layer and the asphalt surface layer;
(3) Reinforcement of loose areas where a certain layer of the road surface is damaged and separated;
(4) Before paving the asphalt surface layer, the base layer should be temporarily opened to traffic to prevent water damage to the base layer due to weather or vehicle action.
The sealing layer can be divided into upper sealing layer and lower sealing layer; according to the construction type, a single-layer surface treatment method of mixing method or layer paving method can be used, or an emulsified asphalt slurry sealing layer can be used.
The asphalt surface layer of highways and first-class highways in rainy and humid areas has a large porosity and is likely to have serious water seepage, or paving When the base cannot be paved with asphalt surface layer in time and vehicles need to pass, it is advisable to lay the lower seal layer after spraying the oil-permeable layer.
The lower seal layer is set on the surface of the semi-rigid base to protect the base from being damaged by construction vehicles, facilitate the curing of semi-rigid materials, prevent rainwater from seeping into the structural layer below the base, and strengthen the connection between the surface layer and the base. There are many construction methods for the lower seal layer.
The upper seal layer should be laid on the asphalt surface layer in the following situations:
(1) The gaps in the asphalt surface layer are large and water permeability is serious.
(2) Old asphalt pavement with cracks or repairs.
(3) Old asphalt pavement that needs to be paved with a wear layer to improve the anti-skid performance.
(4) New asphalt pavement that needs to be paved with a wear layer or a protective layer.
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