Plastic Geogrid
Used to reinforce embankment slopes, retaining walls and dams. Its chain structure helps to transmit forces evenly. It also prevents soil erosion and ground subsidence.
Made of high-density polyethylene or polypropylene, it is UV stabilized and chemical resistance. It can be divided into uniaxial and biaxial plastic geogrid according to its stretched direction.
Uniaxially Stretched
Uniaxially stretched plastic geogrid is made of high molecular polymer extruded into plastic geogrid a sheet, then punched to form a regular mesh pattern and finally stretch in the transverse direction. This process reorients the originally scattered chain molecules, making the grid stronger and resistant to elongation. The material is often used in road construction to prevent soil displacement and improve the bearing capacity of sloping ground.
This type of netting based geosynthetics is one-way elastic and has good friction with sand and gravel. It can also be used to reinforce asphalt or cement pavements. It has a large tensile strength, and its chain structure helps distribute forces evenly in the soil. It is also easy to install and can be adapted to various construction projects.
Uniaxially stretched plastic geogrids can resist freezing, and are ideal for use in frozen soil. They are also widely used in highway, railway and sloping construction to improve load capability and extend the lifespan of the road. These geogrids are also suitable for use in building foundations, retaining walls and slope reinforcement. In addition, they are characterized by their resistance to chemical degradation.
Biaxially Stretched
Plastic geogrid is an important engineering material that is used to reinforce embankment slope, dam, and retaining wall. It can improve the bearing capacity of roadbed and foundation, prevent soil subsidence and ground flawing, and save construction time and cost. Its chain structure can transmit forces evenly, so it can also prevent water loss and soil erosion. It is widely used in railroad and highway construction, as well as in the reinforcement of earth slopes.
The process of producing biaxially oriented plastic geogrid involves a series of steps, such as plasticizing extruded sheet, punching, heating, and stretching longitudinally and transversely. The result is a high tensile strength in both longitudinal and transverse directions, which ensures that the grid is not easily deformed. In addition, the tensile stress and strain are evenly distributed across the entire surface of the grid, which makes it a reliable and economical engineering material.
In order to determine the effect of pre-punched hole diameter on the mechanical properties of triaxial polypropylene geogrid, stretch forming simulation and tensile fracture tests were performed using industrial PP sheets with different pre-punched hole diameters. The results showed that the tensile strength of the polypropylene geogrid increased gradually with the increase in the diameter of the pre-punched holes, and reached its maximum value when the pre-punched hole diameter was 2.6 mm.
Steel
Steel plastic geogrids are made of high tensile strength steel wire(or other fiber) specially treated and polyethylene (PE) with additives, which is extruded and pressed into a single belt with a rough pressure pattern, then it is welded by special strengthening bonding fusion welding technology to form the composite high-strength anti-pull and anti-deformation steel-plastic geogrid. It is characterized by high tensile strength, small elongation force, strong interlocking strength with soil or gravel, high UV resistance and anti-aging performance, good corrosion resistance, lightweight and low construction cost.
It is suitable for reinforcement of roads, railways, airport runways, embankment reservoirs and dams, retaining walls and slopes, etc. It can effectively shorten engineering cycle and greatly save construction costs.
When compared to metal mesh wire, the steel-plastic geogrid has a similar peak tensile strength, but less amount of steel is used. In addition, it has a higher node peeling strength, higher network wire-bearing capacity, and more contribution rate of the wire mesh wire to the overall load-bearing capacity than the metal mesh. Therefore, the steel-plastic geogrid can replace the wire mesh in rock support to a certain extent. Moreover, it has better creep properties and can resist deformation of surrounding rocks, and is also easier to construct and install. Moreover, the steel-plastic geogrid can also be a kind of high-strength prestresses anchor combined support, geogrid for retaining walls which applies enough pre tightening force to the rock and improves the stress state of the surrounding rock, thus controlling the deformation of the surrounding rock effectively.
One-Way
The unidirectional plastic geogrid is a high-strength layout material used for soil reinforcement in various engineering fields, including railways, highways, grey machine runways, retaining walls and embankment projects. Its unique occlusal and interlocking effects can greatly enhance the bearing capacity of foundations, control the development of settlement, confine the road base to effectively distribute the load over a larger area, and reduce engineering costs.
It is made from extruded polymer plates (raw materials include polypropylene and high-density polyethylene) and directional stretched under heating conditions. The directional stretching process makes the chains in the polymer structure become oriented in the direction of the stretching grid and strengthens the linkage between them. This increases the tensile strength of the plastic geogrid and reduces its porosity.
The one-way plastic geogrid is resistant to low temperature and can adapt to a variety of environmental soils. In addition, it has a good corrosion resistance and long service life. It can reduce the rutting of pavements, delay fatigue cracks and shorten the construction cycle. It also helps improve the quality of roadway repairs and reduces the cost of maintenance. This is especially beneficial for highways, which are subject to heavy loads and frequent traffic.
