PP Plastic Two-Way Geogrid

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PP Plastic Two-Way Geogrid

PP plastic two-way geogrid is a kind of high strength biaxially stretched plastic geomaterial with excellent tensile strengths in both longitudinal and transverse directions. It can be used to reinforce embankment slope, dam and retaining wall.

The simulation results indicate that the simulated mechanical properties of the geogrid can be well predicted by its geometrical structure.

High Strength

Two-way bonded and welded geogrid is a new environmentally friendly green building material. It is made by adding fiber reinforcement to polyethylene and polypropylene stretch tapes and then welding them together. It has the advantages of high strength, small deformation, corrosion resistance, long life, convenient and fast construction, and low cost. It can be used in wall retaining, slope stabilization and load support systems.

The mechanical properties of geogrids depend on the structural features and technical parameters of the manufacturing process. It is known that the diameter-to-distance ratio and percentage difference of longitudinal and transverse spacing have a significant influence on the mechanical properties. However, little is known about how the changes in these parameters affect the basic longitudinal ribs of the grid.

This study aims to investigate the effect of these parameters on the tensile and flexural strengths of biaxial PP plastic two-way geogrids. In order to simulate the effects of these factors, a simulation model was developed using Abaqus software. The results showed that the tensile and flexural strength of the PP/HDPE composites were significantly improved when the longitudinal spacing was larger than the transverse spacing. This was due to the fact that the longitudinal ribs of the grid were subjected to more strain than the transverse ribs. These findings could help to improve the performance of PP/HDPE geogrids and to reduce engineering costs.

High Elongation

As we know, the elongation at fracture of a geogrid is very important in engineering applications. The larger the elongation at fracture, the more resistance to deformation it has, which can significantly reduce the stress and strain of the soil or road base. In general, the elongation of a geogrid should be PP plastic two-way geogrid 1.3 times its original length. During the stretching process, the nodes of the grid are deformed to varying degrees. The diameter-to-distance ratio of the holes affects the morphological characteristics, stress and strain of the grid, so the smaller the diameter-to-distance ratio of a hole scheme is, the better its tensile strength, nominal elongation and performance utilization factor are.

During the stretch forming process, the PP plastic two-way geogrid is first stretched longitudinally and then transversely. The longitudinal stretching process is performed under secondary heat preservation, which can perform stress relief annealing on the longitudinal ribs, increase the crystallization rate inside the material and eliminate the stress concentration phenomenon caused by the transverse stretching.

The lateral and vertical strength of a polypropylene two-way geogrid are very high and the tensile force is small, which can provide strong reinforcement for soil or gravel. It also has excellent bending and flexural properties, good corrosion resistance and light weight. It is widely used in construction projects, such as walls, foundations and slopes, to improve soil stability and prevent erosion.

High Stiffness

Two-way PP plastic geogrid is an ideal material for various applications, such as roadbed reinforcement, slope protection and cave wall building. Its unique structure consists of extruded longitudinal and transverse ribs, with an in-plane stiffness that is significantly higher than the conventional geogrid. This property helps it effectively resist the tensile stress and lateral displacement of soil and prevents soil from loosing, which is important for the construction of a solid foundation.

During the manufacturing process, the amorphous molecules in the ribs and junctions of the biaxial geogrid will be re-oriented due to the tensile stresses and strains applied to them. This re-orientation will increase the strength of the joints and reduce the tensile stress of the entire grid. Therefore, the biaxial geogrid has a high in-plane stiffness and good resistance to bending.

The mechanical performance of a biaxial geogrid is mainly measured by its tensile strength, nominal elongation and performance utilization factor. The tensile strength of the biaxial geogrid will decrease when the diameter-to-distance ratio increases, but its nominal elongation and performance utilization factor will both increase.

It is also necessary to consider the long-term degradation of the biaxial geogrid. This is due to the oxidation of polyolefins, which is induced by oxygen pressure and temperature. The oxidation degradation of the PP can be reduced by adding anti-aging materials.

Dual Composite Properties

A special type of polypropylene two-way geogrid is made from a combination of new and recycled material, and it can be strengthened by adding anti-aging materials to increase its durability. This material has Plastic Dimple Drainage Board high tensile strength and low elongation, which makes it ideal for use in roadbeds and other construction projects. It can also be used to reinforce slopes, cave walls, wharf cargo yards, and other permanent bearing foundations.

During the manufacturing process, biaxial geogrids are subjected to large strains and temperatures. The tensile properties of these products are affected by the variation of temperature, and their oxidization degradation is also influenced by oxygen pressure and temperature. To reduce the impact of temperature on these products, they can be pre-stressed before installation to ensure their integrity.

The mechanical performance of a biaxial geogrid is measured by its tensile strength, nominal elongation and performance utilization factor. These parameters can be determined using a video extensometer. The tensile response of the grid can also be determined by the ratio between its axial and lateral strains.

The elongation of a biaxial geogrid can be improved by increasing its longitudinal spacing and decreasing the transverse spacing. However, this may affect its overall mechanical properties. The change in the tensile strength and nominal elongation of the geogrid can be predicted from its GB/T standard tensile test results.

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