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Geotextiles
Geotextiles are a woven or non-woven thermoplastic sheet material intended to allow the passage of water, but not fines, and without collecting fines at the soil-textile interface. Geotextiles are used for a variety of applications. They are road stabilization, seperation of aggregate and soil, subsurface drainage, permanent erosion control (used under rip-rap), and asphalt overlays. Geotextiles have been used for these applications for quite some timeso specifying agencies have made writing specifications for the use of geotextiles easy. Engineers can find specifications by the American Association of State & Transportation Officials, AASHTO M288-99. Each State has their own specifications. Iowa is covered by 4196.01 in the Iowa Department of Transportation Standard Specification book.
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