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TerraGrid® GEOGRIDS

TerraGrid® geogrids are useful in many applications.

High-strength, high-tenacity polyester yarns are woven and coated in a polyvinyl chloride paste. They are inert to biological degradation and naturally encountered chemicals, alkalis, and acids.

TerraGrid® geogrids are constructed of high tenacity polyester yarns and coated with polyvinyl chloride. The open mesh structure allows superior interlocking with the surrounding soil. TerraGrid's high resistance to elongation makes it an ideal material for stabilizing bases, retaining walls, slopes, berms and dikes.

ECONOMICS

Use of TerraGrid® can result in economic savings in several ways. In cut situations where the foot of the slope is fixed, the use of TerraGrid® can greatly reduce the amount of soil that would normally have to be removed. In fill situations, the use of TerraGrid® can greatly reduce the amount of fill which must be imported and placed. In developing a commercial, residential, or industrial site, the amount of usable land can be increased by creating steeper slopes with the use of TerraGrid®. By making the slopes steeper, TerraGrid® can help the engineer or designer economically use his construction site.

The function of TERRAGRID® geogrids in ground stabilization application is to spread the loads imposed upon the system. It accomplishes this by diverting the downward stresses laterally along the Ground Stabilization grid.

MECHANICS
In many situations, TERRAGRID® makes it possible to reduce the thickness of the base. Benefits include savings in aggregate and improved long-term performance. TERRAGRID® can be used in a variety of stabilization projects including:

• STREETS
• ROADS and HIGHWAYS
• PARKING LOTS,
  STORAGE AREAS and CONSTRUCTION ENTRANCES
• ACCESS LANES for FIRE/ EMERGENCY VEHICLES
• RUNWAYS, APRONS,
  TAXIWAYS, and OVERRUN
  AREAS
• RAILROAD TRACK BEDS
• TEMPORARY ACCESS

In a ground stabilization application, the function of the aggregate layer is to spread the loads imposed on it so that the pressure, or force per unit area, exerted on the subgrade is reduced below the critical value. The aggregate layer transfers the load outward as well as downward away from the source. Spreading of loads is accomplished by the interlocking and friction that occur between individual granular particles. The aggregate must be well compacted during construction and remain compacted and free from fines during the life of the project. In other words, for the aggregate layer to perform as designed throughout its intended life, the original quality and degree of the compaction must be preserved.

Aggregate support systems are improved with the use of a geogrid. TerraGrid® geogrids contribute to the long-term performance of aggregate layers because of their ability to confine. A geogrid's high resistance to elongation and its ability to interlock with the aggregate allow it to reinforce the aggregate layer. TerraGrid® also provides a high friction surface that resists lateral movement by the aggregate, thereby confining those particles in direct contact with the grid. The state of compaction of the aggregate determines how well this layer can withstand lateral pressure above the lowest level.