RoyalGrid RT45™ geogrid


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Geogrid made up of extruded polypropylene. It provides superior stiffness, structural reinforcement, aperture stability and interlock capabilities. It reduces lateral spreading of the base course thereby increasing the structural performance. It helps in reducing the aggregate thickness.

RoyalGrid™ 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.

Biaxial Geogrids

In the application of base reinforcement in pavements there is the design intention of improving the bearing capacity of an existing sub-grade by including one or more geogrid layers above. The inclusion of a biaxial geogrid generally permits a reduction in granular base course thickness.

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.

Royal Technergy offers Secugrid® biaxial geogrids in a range of strengths between 20kN/m to 80kN/m and Combigrid® geogrid/geotextile composite in the same strength grades.

Uniaxial Geogrids

The ACEGrid® high performance geogrid range, are engineered products for applications of short term and long soil reinforcement. The product is woven with strength in both the roll length direction (commonly called the machine direction-mD) and with strength manufactured in the cross roll direction (commonly called the cross direction-CD). Generally the strength of the product will be dominant in one direction of the roll (normally the mD) with sufficient strength in the other direction of the fabric (normally CD) such that the fibres are dimensionally stable and the roll may be easily deployed.

In applications of soil reinforcement the use of ACEGrid® engineered geogrids allows significant tensile strength to be imparted to soils. Soils are very weak in tension. the use of soil reinforcement techniques has proven to be a very cost effective method of construction. ACEGrid® engineered geogrids are manufactured from high tenacity polyester (pEt) fibres with high molecular weights and low carboxyl end groups such that the product is suitable for use in normally occurring soil types, for design lives in excess of 120 years. ACEGrid® high performance geogrids are available in a range of strengths from 40kn/m to 900 kn/m tensile strength

Common Applications for Geogrids

Royal Technergy biaxial geogrids are designed to interlock with soil and aggregate and are ideal for applications such as:

  • Base and subgrade reinforcement
  • Construction of unpaved and paved roads

Royal Technergy uniaxial geogrids are designed to provide long term design strength and are ideal for applications such as:

  • Reinforced slopes
  • Embankments
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