Different Types of Plastic Geogrid
Plastic geogrid is widely used in the construction of road, railway, slop and dam. It is resistant to low temperature, chemical and biological degradation. It can effectively shorten the engineering cycle and save the project cost.
It is made of high molecular polymer extruded into sheet and punched into a regular mesh pattern, then stretched. The originally scattered chain molecules are reoriented during the uniaxial stretching, thus forming an integral structure with high node strength.
Uniaxial
A uniaxial plastic geogrid is a kind of mesh-like fabric used to strengthen soil. It can help prevent lateral movement of soil and improve the stability of civil engineering construction projects. It also protects against erosion and can be used for slope stabilization and retaining walls. Its high tensile strength makes it a popular reinforcement material for roadbeds and highways. Uniaxial geogrids are made from a single layer of strong textile fibers that are tightly woven together to form a grid. These products are available in a variety of sizes and thicknesses, making them suitable for many applications.
These geogrids are manufactured by extrusion, stamping, heating and stretching processes to give them a high tensile strength. They are also resistant to weathering and UV degradation. They can be used in a wide range of construction projects, including roads and railways. The main materials used for uniaxial plastic geogrids are polypropylene and high-density polyethylene.
Unlike biaxial plastic geogrids, which have two-way stretch and provide the same mechanical properties in both longitudinal and transverse directions, a uniaxial plastic geogrid has one-way stretch and provides stabilization in only one direction, namely longitudinal. They are usually used in the construction of roadways, highways and railways to reduce construction cost and increase bearing capacity. They are also used to stabilize steep soil slopes.
Biaxial
Biaxial plastic geogrid is a strong, long-lasting product which is highly effective in soil stabilization and base reinforcement applications. Its chain-like structure enables it to transfer loads evenly over the soil surface, thereby greatly increasing its bearing capacity and prolonging the lifespan of constructions. Moreover, its high-strength ribs and nodes provide excellent confinement and lateral strength.
Biaxial pgr is made in Polypropylene using a special punching process. This allows the grid to be used in a variety of projects, including road and railway constructions. It is also highly resistant to environmental stress cracking, hydrolysis, and micro-organism attack. Its ability to disperse load through interlocking with granular material enables the grid to resist horizontal shear forces from the fill, which in turn maximises the bearing capacity of soft soil.
This type of plastic geogrid is available in two aperture sizes to match with project fill and has a high tensile strength of up to 30KN/m. It is recommended that heavy plastic geogrid duty hand protection be worn when handling this type of product.
During the production of biaxial plastic geogrid, it is always stretched longitudinally first and then transversely. The diameter-to-distance ratio and percentage difference of longitudinal and transverse spacing may change the mechanical properties of the ribs, which is important for practical use. Therefore, this study simulated the morphological characteristics and stress-strain law of biaxial plastic geogrid using different pre-punched diamond-shaped hole plates.
Triaxial
A triaxial plastic geogrid is a form of polymer reinforcement that can be used in many civil engineering projects. It can be extruded, woven or bonded. Extruded geogrids are made of high molecular polymers like industrial polypropylene and polyethylene and are molded into flat sheets. They are then punched into a regular mesh pattern and stretched in the transverse direction. These structures have good flexural stiffness and tensile strength and can be a cost-effective alternative to other geogrids.
These geogrids have three principal directions of stiffness and can be used to improve the performance of paved and unpaved roadways. They are ideal for road reinforcement as they can reduce subgrade deformation and rutting. They also have a high degree of confinement that can help reduce the amount of stress applied to aggregate particles, resulting in an increase in load distribution and bearing capacity.
The mechanical properties of multi-axial plastic geogrids can be tested using single rib or multi-rib methods. The tensile strengths of the ribs and codes are measured, and the average of the effective tensile strength is determined. The tensile strength of the POMG with different schemes of pre-punched holes is shown in Table 2. It was found that the tensile strength of the POMG formed by circular and semicircular holes is higher than those formed by other schemes.
Steel-plastic composite
The steel-plastic composite plastic geogrid has a high tensile strength, which allows it to be used for many civil engineering projects. It is also easy to construct and can be used to reinforce the soil foundation of a bridge, embankment, dam, and retaining wall. It can also be used to strengthen the soil slope and prevent erosion. It is ideal for use in earthquake-prone areas.
It is mainly made of polymer, and its ribs are reinforced by steel wires. The longitudinal and transverse ribs are woven into a net and then welded together using ultrasonic technology. This process ensures that the ribs are not pulled or Geosynthetic material geotextile broken during stress. The ribs are then coated with polyethylene, which protects the steel wires from corrosion and improves their abrasion resistance. This coating also makes the grating resistant to acid, alkali, salt solution, oil at room temperature, and water dissolution, which ensures its durability. It is a good substitute for traditional bolt mesh supporting structure, which suffers from poor performance and cost.
The growth of the steel-plastic composite plastic geogrid market is driven by a rise in infrastructure development projects. This is due to the increased focus on sustainable construction practices and the need for efficient soil reinforcement solutions. The market is also expected to grow in North America, Europe, Asia-Pacific, Latin America, and Middle East & Africa.
