Plastic geogrids are polymer mesh materials with square or rectangular shapes formed by stretching, which are punched on extruded polymer sheets (mostly made of polypropylene or high-density polyethylene) and then subjected to directional stretching under heating conditions. Unidirectional stretching grids are only made by stretching along the length direction of the sheet, while biaxial stretching grids are made by continuing to stretch the unidirectional stretching grid in a direction perpendicular to its length. Due to the rearrangement and orientation of polymer polymers during the manufacturing process of plastic geogrids, the bonding force between molecular chains is strengthened, achieving the goal of improving their strength. Its elongation is only 10-15% of the original plate. If anti-aging materials such as carbon black are added to the geogrid, it will have better durability such as acid resistance, alkali resistance, corrosion resistance and aging resistance. Geogrid testing item ① Tensile strength: In a tensile test, the large tensile stress that the sample experiences until it breaks is called tensile strength, which is called tensile strength in the academic community. ② Elongation rate: Elongation rate refers to the percentage of the total deformation of the gauge length segment of the specimen after tensile fracture compared to the original gauge length Tear strength: It is a term defined in a test method for determining the tear resistance of thin films or sheets. This method is a tearing test conducted on specimens with specified cracks on a specialized testing machine Breaking strength ⑤ Thickness ⑥ Mass per unit area ⑦ Permeability coefficient: Permeability coefficient, also known as hydraulic conductivity coefficient. In isotropic media, it is defined as the unit flow rate under a unit hydraulic gradient, indicating the difficulty of fluid passing through the pore framework

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