The Bombay Textile
Research Association

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Geocomposites are formed by the combination of geotextiles, geogrids, geonets or geomembranes for improved structures and enhanced functions. There are many examples of composite geosynthetic materials. Examples include laminated PVC membranes made by calendering methods, woven and nonwoven fabrics with spread-coated impermeable membranes, and sheathed high-tenacity fiber bundles. Some of the best examples are prefabricated drains that comprise a sandwich structure with an inner core material (either a net or three-dimensional pressed polymer sheet) that acts as a flow conduit, and surface veneers made from geotextile filter fabrics. Geocomposites are typically combinations of a drainage (and sometimes barrier) material with a geotextile filter to prevent soil migration into the drainage system.
The Bombay Textile Research Association (BTRA), a pioneer textile research institute over the 65+ years, was established in 1954 by Govt. of India along with the industry association to boost research, conducting testing, consultancy and certification in the field of textile, polymers, fibers and other materials.
Following are the tests done at BTRA for geocomposites
  • Bond strength (Ply adhesion) [ASTM D:7005]
  • Hydraulic transmissivity using constant head [ASTM D:4716]
  • CBR Puncture Strength [ASTM D: 6241] [ISO:12236]
  • Breaking force [ASM D:7179]
  • Compressive strength ASTM D 1621

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