Gabion-life-expectancy | gabion1.co.nz

Gabion Basket Design Life Chart

See recent walls

Galfan Lasts
2-3x longer

ISO Standard
EN ISO 9223

Life Expectancy
LIFE SPAN

Expected Life
Expectancy

C1: Very Low
100 years +

C2: Low Areas
100 years +

C3: Medium Areas
50 years +

C4: High Areas
30 years +

Special Environments.

In New Zealand there are areas where local conditions create an increased likelihood of corrosion. Special consideration should be given to material selection and design in these areas. They include:

1. Geothermal Areas

Hydrogen sulphide associated with geothermal activity creates a corrosive environment. Variations in natural activity or draw-off from steam bores plus the effects of weather conditions make the high risk areas hard to define.

2. West Coast, South Island

In this area, smoke from the coal burning fires may cause high concentrations of sulphur dioxide in the air. The combination of this and the high rainfall for the region creates an aggressive situation which must be considered . The effects of a severe coastal environment aggravate the situation. This area combines the most severe features of both industrial and coastal environments.

3. Coastal Environment

Within 1000m of the coast, characterised by: Light salt deposits A frequent smell of salt in the air In the immediate vicinity of large expanses of calm salt water such as harbour foreshores This environment may be extended inland by prevailing winds and local conditions.

4. Industrial Environments

Within 500m of corrosive industrial emissions and subject to heavy fallout from them.

Acidic Soils.

When constructing gabion retaining walls in strongly acidic soils (PH over 5.5), the soil and the corrosive groundwater must be separated from the gabion structure by using geotextile fabrics and a properly designed drainage system.

Galvanisation.

Galvanising protects the gabion steel in two ways

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