Monday, October 29, 2012

Retaining Walls - Important Australian Standards

By Jerry Wilson


It is important that everyone involved in your project's construction uphold a commitment to Australian Standards for retaining wall structures and the components.

When shortcuts are taken with retaining wall systems, problems may not manifest for years, or may strike when the structure is put under stress, such as incidences of flood or high rainfall. This can involve very costly remediation work - which can be magnified if the problem flows on to affect nearby buildings and structures.

There are many points to consider when looking at steel and concrete in relation to meeting the Australian Standards of construction of your project, and all links must be considered.

- Steel Reinforcing in Retaining Wall Systems

It is important to consider the quality when working with steel reinforcing for retaining walls. Steel reinforcing in retaining wall systems like AS4100 set out the minimum requirements for the design, fabrication, erection and modification. You need to dig deeper to ensure that the steel has been treated correctly and whether the bar diameter and tensile strength of the reinforcement is appropriate for the load that it will be subjected to.

Hot-dip galvanised structural steel, steel reinforcements, and assembled steel products - AS4680 is the standard for zinc coatings on fabricated ferrous articles. There can be a major difference in the quality of coating adherence between low-quality galvanised steel products and high-quality products. Always remember: just because it is technically galvanised, DOESN'T mean it is galvanised to standard. Typically these coatings need to have a 500-600 gram mass per unit area and 65-85 micron thickness.

If your product components do not meet the Australian Standards for steel quality or galvanisation, the exposure to water and salt spray can lead to MAJOR problems. This can particularly be an issue when it comes to steel structures or steel-supported concrete retaining walls built in marine splash zones.

- Concrete Retaining Wall Systems

AS3600 specifies the minimum requirement for the design and construction of concrete structures, and it is VITAL that you check your product components measure up.

Always check what the required depth of cover for reinforcing is, to ensure strength and protection from possible future "concrete cancer" problems. Also check that the strength of the concrete is correct for the application.

We make sure that EVERY retaining wall project we complete is done properly - and so should you. For your protection, our manufacturing processes and products are inspected and certified on a monthly basis on confirm compliance with AS3600 Concrete Structures.




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