Permeable layer in road engineering: In order to make the asphalt surface layer and non-asphalt base layer combine well, liquid petroleum asphalt, emulsified asphalt and coal asphalt are sprayed on the base layer to form a thin layer, which penetrates into the surface of the base layer to a certain depth.

The main functions of primer are as follows:

(1) penetrates into the pores on the surface of the substrate, enhancing the combination between the substrate and the surface;

(2) It is helpful to combine the fine materials in the aggregate on the base surface;

(3) After the pavement is completed, spreading prime coat oil in time can also reduce the maintenance cost and improve the maintenance quality;

(4) filling the opening on the surface of the base after oil penetration molding to obtain a waterproof layer with penetration depth;

(5) When the pavement is delayed for some reason, the permeable layer can provide temporary protection measures for the grassroots to prevent the damage of rainfall and temporary traffic. ?

Extended data:

evaluation criterion

The permeability and fluidity of (1) permeable materials have a good correlation with their direct shear resistance. With the increasing fluidity, their sliding resistance decreases.

(2) There is a good correlation between the pull-out strength index and the direct shear strength of the transparent material plate, which shows that the influence of interlayer friction factor can be completely eliminated in the vertical direct shear mode.

(3) The key indexes of transparent materials have obvious influence on its shear effect. The performance index of transparent magnetic therapy is controlled by controlling the shear strength index, which provides a basis for improving the evaluation system of transparent application. ?

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