What is a Geogrid?
A geogrid is a geosynthetic with large openings or apertures. Geogrids are used as soil reinforcement below roads, under structures and behind retaining walls. They also reinforce paving overlays.
Geogrids can be uniaxial (strength in one direction) or biaxial (equal strength in both directions) and are made from polyester, polypropylene or fiberglass. Manufacturing methods include woven, knitted, extruded or otherwise “integrally formed.”
- Soil reinforcement
- Paving overlay reinforcement
Biaxial Geogrids for Base Stabilization
Biaxial geogrids are designed to have roughly the same tensile strength in both directions and to distribute loads over a wider area, increasing the load capacity of the soil. Base reinforcing geogrids interlock with the aggregate to confine the base and reinforce the subgrade. In paved or unpaved applications, they reduce rutting and help maintain the desired aggregate depth.
US Fabrics offers BaseGrid biaxial geogrids for base reinforcement. BaseGrid geogrids are the classic polypropylene, single-layer, “punched and drawn” geogrids that have been specified repeatedly and used effectively for decades.
Uni-Axial Geogrids for Slopes & SRWs
Uniaxial geo grids typically have their tensile strength in the machine (roll) direction. They are mainly used to reinforce the soil mass in a steepened slope or segmental retaining wall. On occasion, they function as a wrapping to confine the aggregate in the wire forms of welded wire faced steepened slopes.
US Fabrics uniaxial geogrids are made from polyester yarn, knitted or woven into a stable structure and have a PVC or polymeric coating. These flexible, user-friendly geogrids are inert to biological degradation and resistant to creep, strain and naturally found chemicals.
US Fabrics is pleased to offer Stratagrid geo grid by Strata Systems, Inc. for retaining walls and slopes. Stratagrid is the only precision knitted uniaxial geogrid available in the market today.
Some very light strength polyester geogrids such as Stratagrid 150 are biaxial. These flexible grids are perfect for retaining walls less than 6' tall and are ideal for the novice retaining wall builder or homeowner.