The reinforcement of the steel plastic geogrid to the pavement materials is through the interaction between the steel plastic geogrid and the pavement materials. The interaction is divided into the friction between the grid surface and the mixture, and the passive impedance force of the mixture to the grid ribs. When paving and rolling, the pavement materials will be embedded in the mesh of the steel plastic geogrid, and the three functions can fully restrict the lateral displacement of the mixture.
Fatigue refers to the cumulative failure of. Under the repeated action of stress less than the ultimate strength of the material. The fatigue characteristics are expressed by the number of load actions required to constitute the failure. The fatigue life of the beam with grid is longer than that of the beam without grid, and the effective diffusion stress concentration improves the fatigue resistance. Adding steel plastic geogrid to the bottom of semi-rigid base can delay the fatigue crack growth of semi-rigid base.
Adding steel plastic geogrid to the pavement structure layer can improve the crack resistance of the pavement. At present, the mechanical theory used to analyze the reinforced pavement structure of geosynthetics is not perfect, which is mostly based on the limited explanation theory. The steel plastic geogrid is a mesh structure, the mesh will be filled by the pavement materials, the thickness of the steel plastic geogrid is small, the elastic modulus of the mesh material in all directions, friction and other mechanical parameters are difficult to be determined by experiments. The mechanical deformation of reinforced pavement structure with steel plastic geogrid is a behavior of increasing phase in composite materials.
There are some new structural layers in asphalt pavement. Steel plastic geogrid is a kind of anisotropic material with high rigidity in the vertical direction. The bottom of semi-rigid base is flexural in the horizontal direction, and the composite layer is an anisotropic material between the two. Steel plastic geogrid can reduce the stress concentration at the bottom of the base layer. The steel plastic geogrid prevents the crack from reflecting to the asphalt mixture surface through the base course bottom to control the pavement crack.
The interlocking action with pavement material can improve the shear load resistance of the cross section. Steel plastic geogrid can reduce the shear stress concentration at the crack tip. Steel plastic geogrid can reduce the tensile stress of the base layer, reduce the difference caused by different soil properties, and enhance the integrity of the new and old soil. Prevent premature opening of rigid semi-rigid base material. The maximum deflection value of the wheel center decreases after the crack pavement is paved with steel plastic geogrid.
The change of the modulus of the steel plastic geogrid has a great influence on the reinforcement effect. It is suggested that the larger material of the steel plastic geogrid should be used as much as possible during the construction. In the roadbed widening construction, the uneven deformation will produce the longitudinal crack, and the steel plastic geogrid will play the role of large deformation capacity, reduce the horizontal deformation of the road surface and absorb the horizontal displacement. With the increase of the modulus of the selected steel plastic geogrid, the tensile stress on the bottom of the base decreases, but the shear stress on the bottom of the base and the deflection of the pavement do not change much.
The addition of steel plastic geogrid improves the bending and tensile strength of semi-rigid base material. In the reconstruction of highway pavement, the service life of semi-rigid base pavement can be extended by laying steel plastic geogrid on the semi-rigid base. Improve the deformation ability of semi-rigid materials. The addition of steel plastic geogrid greatly improves the critical toughness of semi-rigid base material, reduces the speed of energy release after cracks appear, and makes the transition from brittle failure to ductile failure without grid. Laying steel plastic geogrid can improve the durability of highway. Laying steel plastic geogrid on the top of the old road can reduce the tensile stress of the bottom layer of the reconstructed road. It is suggested to use steel plastic geogrid with larger modulus in the reconstruction of the road. It has high rigidity.
I believe that after reading the above content, you should also understand the role of steel plastic geogrid added to the pavement structure. I hope it will help you.