By using a geotextile as a barrier, looser or finer materials are prevented from mixing with over or underlying layers. In this way, the separated layers are not re-inserted, water permeability does not deteriorate and the bearing capacity of the surface layer is maintained.

Depending on the method of manufacture, there are two types of geotextiles:

  • Non-woven geotextile – consists of randomly oriented fibers bound together by mechanical, thermal or chemical means. Needle-filtered geotextile is a type of non-woven geotextile.
  • Woven geotextile – consists of threads, ribbons or similar woven together at right angles.
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