Uniaxial geogrid is called uniaxial because the geogrid is stronger in the machine direction than in the cross machine direction. An easy way to remember this is that it means the geogrid's "strength is in the length" so it should be rolled out perpendicular to the face of the wall or slope to the appropriate length based on the engineered plans. Uniaxial geogrids are usually constructed of polyester yarn with a PVC or similar coating. Polyester is a great material for the uniaxial geogrid application because it will give slightly while under strain, allowing it to stretch as the reinforced slope or retaining wall settles while maintaining the strength needed to reinforce the slope or wall. Geogrid performs its job by interlocking with the fill material and reinforcing the soil mass in a slope and by reinforcing the soil mass and connecting to the facing system in a wall whether it be segmental retaining wall block or welded wire form.
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