Design Factors

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1: Durability:

In use geosynthetic products are subject to attack from the local environment.  For Polypropylene and High Density Polyethylene geogrids the only significant attack that can happen is oxidation.  The following document discusses this subject, decribes the range of E'GRID geogrids to investigate their perfomance and presents conclusions and a suitable factor for use in design:
       
        The Durability of E'GRID Geogrids

2: Soil-Geogrid Friction:

The friction characteristics between a geosynthetic product and the soil in contact with it are critical factors for use in safe design.  The following document describes the tests carried out to determine these characteristics for E'GRID geogrids and gives factors for use in design.

        E'GRID Geogrids Soil Friction Characterisitcs

3: Site Damage:

When any geosynthetic product is buried in compacted soil it is damaged to some degree.  The following document describes tests carried out on E'GRID geogrids in a range of soils in accordance with BS 8006.  A simplified table of allowances for use in safe design is drawn from from these tests.

        Site Damage Testing of E'GRID Geogrids

4: Weathering:

If a polymeric material is unprotected it may be damaged by exposure to the Ultra-Violet light in sunlight.  The following Document describes the protection given to E'GRID geogrids and shows that this prevents sugnificant degradation of the products in normal civil engineering design lives.

        The Weathering of E'GRID Geogrids

5: Block Wall Connection

Many reinforced soil walls are built with dry block faces.  For safe design it is necessary to know the strength of the connection that is achieved between the reinforcing geogrids and the blocks.  This is particularly so with blocks that have primarily a frictional connection to the geogrid.  The following document describes testing to determine the characterisitics of this connection between E'GRID geogrids and the "Keystone Compac" block - one of the most popular proprietory block systems.

        Connection of E'GRID Geogrids to Keystone Blocks

6: Bodkin Joint Efficiency:

In many applications of geogrids, for example segmental panel walls and wrap-around steep slopes, it is necessary to join lengths of geogrid together.  Therefore, the efficiency of the joint in transmitting load is a key factor in design.  Integral uniaxial geogrids, such as the E’GRID range, can, uniquely, be joined by “bodkins” – specially shaped joint bars. 
        The Efficiency of Bodkin Joints


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