Geosynthetics (GTX & REGEO)

Geosynthetics are materials manufactured from various types of polymers used to enhance, augment, and make possible cost-effective environmental, transportation, and geotechnical engineering construction projects. They are used to provide one or more of the following functions: separation, reinforcement, filtration, drainage, and liquid barrier.

Geotextiles are typically defined as flexible, textile-like fabrics of controlled permeability used to provide all of the above functions, except liquid barrier, in soil, rock, and waste materials. It should be noted that natural fiber geotextiles (e.g. using jute) are manufactured in some parts of the world and these products are also considered to fall within the geotextile classification.

NTPEP is also studying the use of geocomposite drains and geogrids. Geogrids are generally described as stiff or flexible polymer grid-like sheets with large apertures used primarily as reinforcement of unstable soil (and waste masses.)

The growth of these geosynthetic materials in Transportation, Geotechnical, and Environmental related applications has been dramatic. Total use and sales of these materials are regularly increasing at rates of 10% to 20% per year in each of the above categories. (Source: International Geosynthetics Society, IGS)

The GTX and REGEO work plans can be found by clicking on Documents in the right side menu.

NTPEP Designated Lab:

  • GTX: TRI/Environmental, Inc.
  • REGEO: ​TRI/Environmental, Inc.

Participating Geotextile Manufacturers​

A list of participating Geotextile manufacturers with a quality management system found to conform to the NTPEP GTX work plan.​​

NTPEP - Geosynthetics

Committee Name:
NTPEP-Technical Committee on Geotextiles and Geosynthetics
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GTX Work Plan

REGEO Work Plan

SSGEO Work Plan

Please go to NTPEP DataMine.

Please go to NTPEP DataMine.