SPECIFICATION PROFILE FOR GEOTEXTILES FOR SEPARATION AND FILTRATION IN ROADS - NORWEGIAN STANDARD

A new Norwegian standard for specification of geotextiles was introduced in August 1999. The new standard includes a specification profile system for requirements for geotextiles for separation and filtration in roads. The new specification profile system is based on the experiences from the old classification combined with a research project including laboratory tests, large scale model tests and full scale field tests. The new specification profile includes requirements on minimum tensile strength and minimum elongation at failure obtained by the wide with tensile test, maximum hole size from the cone drop test and a newly developed criteria on minimum strain energy based on the wide with tensile test. The strain energy criteria assumes that a certain amount of the strain energy is "absorbed" during the construction period and that a certain "reserve" of strength and strain should be available for the service lifetime. The specification profile input is subsoil conditions, maximum stone diameter of material adjacent to the geotextile and construction equipment and procedures. For the covering abstract see ITRD E109917.