Concrete filled steel tube (CFST) is a common option for different construction projects. It’s proven to be a great choice because it provides a number of advantages. However, there are some drawbacks too, particularly the corrosion resistance and maintenance needs. This encourages exploration of alternatives like concrete filled aluminium tubes (CFAT). We want to have a closer look at that here. Then, if you need services for tubing, including tube reduction and bending, we’d be happy to help.

CFST

Filling steel tube with concrete is advantageous for a number of reasons. Most importantly, it combines the benefits of the tubing and the concrete. This can enhance key things like the strength, bearing capacity, and fire resistance. It can also improve seismic performance, something that is vital in parts of the world where earthquakes are common.

Although there are all these fantastic benefits, the drawbacks can also be notable. Critically, weight can become an issue. Plus, the corrosion resistance can have a massive impact. It can lead to higher costs for surface coatings, stainless steel, and replacement.

Significantly, there is a lot of research into the performance of CFST. In many cases the steel and concrete can bond effectively. However, there can be issues. Excessively low or high temperatures can weaken it. Freeze-thaw cycles can have a big impact. Worse, if the steel suffers corrosion, the chemical reaction can harm the bond. Speak to us about tube reduction and other solutions.

CFAT

There has been more focus on concrete filled aluminium tubes in the past few years, including research into the bonding performance. As a result, it is growing in popularity.

The key thing here is using aluminium instead of steel can provide some major advantages. It is lighter, has much higher corrosion resistance, and does not require as much maintenance. Additionally, it is fully recyclable, supporting efforts to improve sustainability in the construction industry.

The bonding performance of CFAT isn’t as well known as CFST, but research from the last few years has been a big help. Critically, a study in 2019 found the bond strength of aluminium could actually exceed steel. The main factor was the higher corrosion resistance helping to maintain a stronger bond. Another study from 2026 explored the bond strength of circular and square CFAT, exploring different diameters, widths, and thicknesses. It provides interesting findings, including that bond strength drops as diameter to thickness and width to thickness ratios increases.

Discuss tube reduction and other services with us

Steel and aluminium tubing is fantastic for various applications, including construction, automotive, and much more. We’re happy to help here. Applying our knowledge and experience, as well as outstanding equipment and tooling, we can adapt the tubes in different ways. We can bend them to create complex shapes, offer different types of end forming such as reduction and expansion to create strong joints, and even provide drilling.

So, get in touch today and ask us about tube reduction or any other services. We’re always happy to provide advice and recommendations to help you get the best results.