Arriving at a defined life expectancy of your galvanised steel gabion basket will depend on a number of factors influencing the potential corrosion of the steel. Time of Wetness - This denotes the length of time the metal is covered by water allowing the corrosion process to take place. Salt in the Air - The closer you live to the ocean, the more salt in the air. Airborne salinity increases the potential for corrosion to occur. Pollution in the air - The amount of sulfur dioxide in the air will contribute to the degradation of the galvanised coating.
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In summary, it comes down to where the gabion baskets will be located. Thankfully, many studies have been done over the last 50 years to help paint an accurate picture of what to expect. View the below map below and find out which classification your property falls:
Corrosive Category C1
Corrosivity = Very Low
Locations = Desert zone
Corrosive Category C2
Corrosivity = Low
Locations = Temperate zone with low pollution & Desert zone
Corrosive Category C3
Corrosivity = Medium
Locations = Temperate zone with medium pollution & Subtropical and tropical zones with low pollution
It is worth noting that the GAA have recognised that in Australia, pollution is so low in most environments that it is generally considered that it can be ignored, other than for specific industrial applications or extreme traffic examples.
If you live in South East Queensland or Northern NSW, your property will be classified in corrosive category C2 or C3. There are other corrosive ratings however they have been excluded from this article as they are not relevant. If you wish to learn more about the different corrosive ratings of galvanised steel, I recommend reading the Atmospheric Corrosion Resistance of Hot Dip Galvanized Coatings available from the GAA website here.
The below graph shows the life expectancy before first maintenance is required. In a C3 category, it is 20 years and C2 category, it is 50+ years remembering that the coating thickness of the steel wire is 39.2 microns.
Gabion baskets are widely used for slope protection, retaining walls, channel linings, noise barriers, etc. As the application scope continues to expand, the types of gabion basket derivatives are also quietly changing. Derivatives like gabion boxes and gabion mattresses emerge on the market. Gabion basket moves quickly towards a more specialized and refined direction. When purchasing gabion baskets, we are required to choose appropriate high-quality gabion baskets according to the characteristics of our project, so that we can get the maximum return with the minimum investment. So what factors should be considered in the purchase of gabion baskets?
Application
Generally, we have both double twisted gabion baskets and welded gabion baskets, which are produced by different production processes and are applied to different situations. Here we list their common applications. You can choose the right gabion basket according to your specific application.
Double twisted gabion basket refers to a rectangular box with double-twisted or triple-twisted hexagonal mesh fabric made of galvanized wire, PVC wire, or Galfan wire. It has been successfully used in a variety of applications including retaining walls, river banks, slope protection, channel linings, dams and culverts, etc.
Double twisted gabion baskets for retaining wall
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Double twisted gabion baskets for river banks
Double twisted gabion baskets for slope protection
Made of galvanized steel wire or Galfan wire, welded gabion basket generally has a solid structure, a durable service life and provides higher strength. It is commonly used in engineering constructions and architectural decorations like garden landscaping, trapezoidal gabion walls, interior decorations, gabion fireplaces and building facades.
Welded gabion for garden landscaping
Welded gabions for trapezoidal wall
Welded gabions for interior fireplace
Material
Gabion baskets are generally made of galvanized steel wire, Galfan steel wire and PVC coated wire. These materials have their own unique advantages; you can choose the right material according to their characteristics.
Structure
In addition to gabion boxes, we also have a similar product – gabion mattress . Similar like gabion boxes, gabion mattresses are divided into double twisted gabion mattresses and welded gabion mattresses, which are widely used in hillsides, river linings, bridge protection and river bank erosion applications.
Its main difference from gabion boxes is that the gabion mattress is relatively lower in height. Generally, it is 0.15 m, 0.17 m, 0.23 m, 0.3 m, and 0.5 m in height and presents a flat structure, which offers more stability. The gabion box is generally 1 m in height. You can choose corresponding products according to your application. For example, you can choose gabion mattresses for river bank slope protection as its flat structure provides more stability; you can choose gabion boxes for river bank elevation & reinforcement due to its height.
Size
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