tiitelleht maanteede remondi geotekstiilide ja ... - Maanteeamet

LÕPPARUANNE – MAANTEEDE REMONDIL GEOTEKSTIILIDE JA ARMEERVÕRKUDE KASUTAMINE
18. ABSTRACT
USE OF GEOTEXTILES AND -GRIDS ON ESTONIAN STATE ROADS 2002-2006
Geosynthetics is concept for a certain group of materials. These are synthetical materials used
in land and hydraulic constructions. There is a wide variety of geosynthetics in use that are
meant for performing different functions in different building-constructions and their parts,
including road building. In road building, they are used widely all over the world. In
developed countries there are almost no roads without geosynthetic components. In Estonia
first steps are still taken in the field of geosynthetical road building, however almost 47 km of
reinforcement geosynthetics has already been installed in the state roads, including 12 km of
steel grids. This research analyses the use of geosynthetics in Estonian roads that have been
built from 2002-2006.
In 10.01.2006 Technical Center of Estonian Roads Ltd. and Estonian Road Administration
signed a contract for researching the behavior of different geosynthetics and steel grids in
exploitation and therefore making suggestions for successive use of geosynthetics. To make
sure whether it is useful to use geosynthetics, defects were accessioned all over the coverage
of geosynthetics. Roughness, dynamical pressure and transversal roughness were measured on
almost all of the road parts to see what effects geosynthetics had on roads. From those results
conclusions were made. Geosynthetics that are deployed into road-constructions differ in their
function. There are two types of geosynthetics: ones that are placed in the soil and ones that
are mounted into asphalt-constructions. In either case different standards are followed.
The usage of geosynthetics in road building is overseen by the Estonian standard EVS-EN
13249:2001 with a supplement A1:2005 that is based on the European standard EN
13249:2001. European standard EN 13249:2001 states that the numbers of different
characteristics have to be assigned to a geosynthetic with a certain function. In case of
different functions the list of characteristics differs. All the materials in use have to respond to
the required standard. There is no qualification system for geosynthetics in Estonia, but there
are different qualification systems for geosynthetics elaborated by specialists from all over the
world. One of the possible version is NorGeoSpec from the Nordic Countries and the other
one is GRK thought up by the Germans.
When using NorGeoSpec, you can choose an appropriate geosynthetics for a certain situation
for separating and filtrating different layers of soil. NorGeoSpec takes into account the
qualities of subsoil and infilling, the building conditions and the quality requirements meant
for the road.
GRK divides geotextiles into five different classes by their resistance to mechanical
deformation; therefore GRK is based on the qualities of geotextiles.
The primal Contract goal was to compile new guide for using geosynthetics, but it was
changed, because it had already been done and Estonian Road Administration ratified it. So
the new Contract goal was to supplement the existing guide.
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