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Understanding key geogrid attributes

Key geogrid attributes

Attribute Product   Description
Height of rib A higher rib height gives a greater vertical surface for the stone to lock up against and thus more effectively transfer stresses from the stone to the grid. TerraGrid Pro is designed and manufactured to optimise this rib height.
TerraGrid Pro 3030 2.4mm
TerraGrid Pro 4040 3.2mm
Aperture area The greater the open area of the grid the more space is available for the stone to penetrate and interlock with the grid. TerraGrid Pro is designed and manufactured to optimise this open area.
TerraGrid Pro 3030 84%
TerraGrid Pro 4040 84%
Tensile load @ 2% strain (kN/m) This is a measure of the stiffness of the grid and therefore its ability to confine the soil at low strain (2%). The higher the load the better the grid can hold the soil together at the typically low strain conditions that exist under a load.
TerraGrid Pro 3030 11 x 11
TerraGrid Pro 4040 14.5 x 15
Tensile load @ 5% strain (kN/m) This is a measure of the stiffness of the grid and therefore its ability to confine the soil at low strain (5%). The higher the load the better the grid can hold the soil together at the typically low strain conditions that exist under a load.
TerraGrid Pro 3030 21.6 x 21.6
TerraGrid Pro 4040 28 x 29
Junction efficiency The junction efficiency (the junction’s strength compared with the tensile strength of the rib) of a biaxial geogrid is determined from the results of two tests developed by the Geosynthetics Research Institute, Philadelphia, USA. GRI GG1 measures the strength of an individual rib of the geogrid.GRI GG2 measures the shear strength of a pair of junctions on either side of a rib. The Junction Efficiency is the ratio of the mean GG2 test result to the mean GG1 test result. The higher the efficiency the better the grid will perform in retaining and interlocking.
TerraGrid Pro 030 >/=95%
TerraGrid Pro 4040 >/=95%
Carbon black content Polypropylene in its natural form is subject to UV degradation. Carbon black is added to counter this.
TerraGrid Pro 3030 2%
TerraGrid Pro 4040 2%
Raw material Control of the raw material is essential to ensure consistent and controlled grid properties. It is more difficult to know the provenance and therefore the properties of externally sourced recyclate.
TerraGrid Pro 3030 Virgin PP and internally generated manufacture recyclate
TerraGrid Pro 4040 Virgin PP and internally generated manufacture recyclate
ISO 9001 certificate number ISO 9001 details the steps necessary to adopt a Quality Management System (QMS) in line with the International Standards Organisation (ISO). ISO 9001 is designed to help organisations ensure they meet the needs and expectations of both customers and other interested parties. Third-party certification bodies offer independent confirmation that an organisation meets the requirements of the Standard. This is achieved through an auditing process that involves gathering evidence of conformance to the requirements of each clause of the standard.
TerraGrid Pro 3030 00617Q31529R5M
TerraGrid Pro 4040 00617Q31529R5M
CE mark FPC certificate number The CE mark is required for a grid to be sold legally in the EU from 1st July 2013. A declaration of performance for its regulated characteristics (defined in its harmonised standard) must be drawn up. The manufacturer, by drawing up his DoP, assumes the responsibility for the conformity of the grid with the declared performance. The application of the CE mark follows the DoP and effectively certifies that the manufacturer has strictly followed all the applicable procedures in drawing up their DoP and that, consequently, the DoP is accurate and reliable.
TerraGrid Pro 3030 0338 CPR 5400
TerraGrid Pro 4040 0338 CPR 5400
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