Global Synthetics geogrids are manufactured from the extrusion, weaving or welding of a polymer to form open aperture products of varying strength, strain and load carrying capability for applications of soil reinforcement.
Generally geogrids have a primary strength in one direction only (uniaxial geogrids) although in certain applications the strength may be equal in both directions of the product (biaxial geogrids).
Geogrids work by interlocking with the granular or soil material placed over them. The open apertures of the geogrid allows for confinement of the material within, thereby increasing the shear strength of such materials.
Geogrids are typically used in such markets as segmental block retaining walls, slope reinforcement, pile cap platforms and base reinforcement applications such as roads, carparks and rail line construction.
In the application of base reinforcement there is the design intention of improving the bearing capacity of an existing subgrade by including a geogrid (or layers of geogrid) over the in-situ subgrade to minimise the amount of granular material needed in the base course (or pavement) design. In some situations there may be a requirement to increase the service life of the pavement by the inclusion of a geogrid for a fixed pavement depth.
The preferred geogrid in such applications is a biaxial “stiff” high modulus product. Global Synthetics are able to offer Secugrid® which is a low strain biaxial (equal strength in both directions) geogrid with higher strengths than most other geogrids at strain levels of 1%, 2% and 5%. Stiffer geogrids pick up load more quickly and consequently operate at strain levels appropriate to pavement performance levels.
Advantages of using highly drawn polypropylene and polyester georgids by Naue and Global Synthetics.
Secugrid® geogrid was used to strengthen a large proposed parking area to service the Harvey Norman store in Maroochydore. The pavement was founded on very soft soils.
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