PP/PE Geogrid are used primarily within the granular layers of road construction, or in access tracks in forestry, mining and agriculture. They also provide a soil stabilisation function.
biaxial geogrid control deformation and rutting within these structures, and often enable the thickness of these granular layers to be reduced. are high modulus polypropylene (PP) grids, produced by an punched and extruded process and characterized by a tensile resistance in both longitudinal and transverse directions.
Use & Purposes
.Access Road Construction
.Crane & Rig Platforms
.Pavement Support
Highlights
.Ease of Product Handling
.geogrid Interaction Characteristics
.Geogrid Strain Characteristics
.Wide Roll Width
General Information
Geogrids are polymeric products formed by joining intersecting ribs. They have large open spaces also known as “apertures”. The directions of the ribs are referred to as machine direction (md), orientated in the direction of the manufacturing process or cross machine direction (cmd) perpendicular to the machine direction ribs. Geogrids are mainly made from poly – meric materials, typically polypropylene (PP), high density polyethylene (HDPE) and polyester (PET).
Product Information
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. pp geogrid 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.
Applications
There are several major markets for geogrids. These are base reinforcement, earth retaining wall construction including veneer stabilisation, the segmental retaining wall market, embankment reinforcement and pile cap platforms. biaxial geogrids are primarily used in base reinforcement applications. The base reinforcement market is just what the name implies. These are applications where an engineer is trying to improve the performance of a gravel base over poor soils, trying to minimise the amount of gravel in the base course design, or increasing the life of the surface cover, concrete or asphalt. Geogrids are used under parking lots, airport runways, gravel construction roads, highways, dam levees and railroad tracks.
Plastic Geogrid Specifications
Item | TGSG15-15 | TGSG20-20 | TGSG25-25 | TGSG30-30 | TGSG35-35 | TGSG40-40 | |
Tensile Strength (kN/m) | Longitudinal | ≥15 | ≥20 | ≥25 | ≥30 | ≥35 | ≥40 |
Transverse | ≥15 | ≥20 | ≥25 | ≥30 | ≥35 | ≥40 | |
Elongation Rate (%) | Longitudinal | ≤13 | ≤13 | ≤13 | ≤13 | ≤13 | ≤13 |
Transverse | ≤16 | ≤16 | ≤16 | ≤16 | ≤16 | ≤16 | |
Strength at 2% elongation (KN/m) | Longitudinal | ≥5 | ≥8 | ≥8 | ≥11 | ≥12 | ≥13 |
Transverse | ≥7 | ≥10 | ≥11 | ≥13 | ≥14 | ≥15 | |
Strength at 5% elongation (≥KN/m) | Longitudinal | ≤8 | ≤10 | ≤11 | ≤15 | ≤15 | ≤16 |
Transverse | ≤10 | ≤13 | ≤13 | ≤15 | ≤18 | ≤20 | |
Benefits of PP Geogrid
.True biaxial geogrid with equal strengths in both the machine and cross machine direction which allow stress transfer in all directions, e.g. in road curves.
.Strength – Higher strengths than most other geogrids @ 1%, 2% and 5% strains.
.Modulus – Very high modulus which means this product will pick up the stresses quickly with little or no movement in the overlying base materials.
.Wide rolls will translate into less overlaps. In a large flat area this will result in less material required and save overall costs.
.Resistance to installation damage – Installation damage testing is performed on geogrids to see what, if any, damage occurs to the geogrid during installation.
