A geogrid is geosynthetic material used to reinforce soils and similar materials. Geogrids are commonly used to reinforce retaining walls, as well as subbases or subsoils below roads or structures. Soils pull apart under tension. Compared to soil, geogrids are strong in tension. This fact allows them to transfer forces to a larger area of soil tha...
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http://en.wikipedia.org/wiki/Geogrid
a form of geotextile which is a relatively stiff, mat-like material with open spaces in a rib structure.
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http://www.textilesintelligence.com/glo/index.cfm?SECTION=G
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