There is a range of different geogrids available on the market, each suitable for different applications. One of the most obvious differences between types of geogrids is their construction, which can be broadly divided into three categories:
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Secondly, what are they made from?
Typical polymers (or plastics) that geogrids are made from include polyester (PET), polypropylene (PP) or High Density Polyethylene (HDPE). The material they are made from determines its construction or manufacturing method.
Geogrids were first introduced in the s as a way to mechanically stabilise granular fills, and since their inception, they have become more technologically advanced, spawning a range of variants and types that are suited for different purposes.
Most often used for reinforcing pavements and capping layers in road and railway projects, biaxial and uniaxial geogrids were first to hit the market, with triaxial geogrids following not far behind.
Although the triangular apertures of triaxial geogrids were heralded as a more effective way to reinforce soil, various trials have shown that results can vary (refer to the attached report for more information).
The main engineering mechanism for pavements reinforced with geogrid is lateral confinement of the granular material. This is achieved by interlocking the granular fill into the openings in the geogrid. The lateral confinement and interlocking forces of the geogrid are critical to holding the pavement in place, so the design of the geogrid has been studied, refined and perfected over the years.
That is why, rigid, integral geogrid junctions provide the best performance for this mechanism.
Nowadays, there are variations typically available from a geosynthetics supplier. Let&#;s take a look at these in more detail.
Biaxial geogrids are designed to handle forces in two lateral directions in the ground, and they are generally designed with square or rectangular apertures. These types of geogrids are ideal for situations where dynamic stress/load is applied in both orthogonal directions, such as in road and railway traffic.
Designed to contain and stabilise granular material and improve its bearing capacity, they help to reduce select granular material costs due to the reduced thickness of aggregate and subbase material required in a temporary or permanent P-way pavement.
One of our most popular uniaxial geogrids is TerraGrid® Uniaxial PET geogrids. This high-performance soil reinforcement solution offers excellent tensile strength in one direction. TerraGrid Geogrid interacts with the soil particles to create a permanent composite soil/geosynthetic structure.
This type of grid is best suited for walls and slope soil reinforcement applications, as the load transfer is only in one (uniaxial) direction.
The Polyfabrics engineering team is here to offer support, advice on product selection and engineering guidance on our range of geosynthetic products. Contact our technical team to find out more.
Geogrid is used in numerous civil engineering related applications to reinforce soils. It has high tensile strength which allows it to transfer forces across a larger area of soil than otherwise would be the case. There are three types; uniaxial, biaxial, and triaxial. Each of these are suited for specific applications which are highlighted in each explanation of the different types.
As the name suggests, this type of geogrid is strong in the longitudinal direction. &#;Strength is in the length&#; and it should be rolled out perpendicular to the wall or slope you are working with.
Uniaxials are used to help soils stand at virtually any desired angle; from 0 to 90 degrees. They can be combined with a wide variety of facing elements in retaining wall and slope applications to produce the desired structural or aesthetic conditions for any project.
For this type, a polymer sheet is punctured and then stretched in both directions. As a result, its tensile strength is equal in the transverse and longitudinal directions.
It is suitable for various applications such as embankment reinforcement, wall reinforcement, soil stabilization, slope protection and other permanent load bearing foundation reinforcement.
This innovative product is made from high-density polyethylene and takes advantage of the unique load bearing properties of triangles. When arranged in a triangular grid, the geogrid is able to bear loads in all directions. This kind of geogrid can greatly enhance the load bearing capabilities of asphalt pavement and can greatly reduce the thickness of the layer of asphalt required.
This triangular structure can provide an enhanced bearing system, which can reduce the thickness of layers. For example, the application of triaxial geogrid in asphalt pavement can greatly reduces the layer of asphalt. It performs well in the reinforcement of soft soil, roadbed, subgrade and retaining wall.
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To find out more about our range of geogrid or for any technical assistance please contact our sales team via : [ protected] or 465 888.
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