Spalling Concrete

Understanding concrete spalling

Concrete cancer is caused when the steel reinforcing within a concrete slab begins to rust. As the steel rusts it expands, displacing the concrete around it, causing it to become brittle and crack thus accelerating the process.

  • Crazing and cracking concrete (concrete spalling)
  • Rust stains which seem to leak out from within the concrete
  • Bubbling (also called Plating) of concrete render
  • Leaks which appear in overhead concrete surfaces

The dangers of concrete spalling

Concrete spalling – especially on the outside of a building – not only looks terrible, but it is potentially dangerous too. Over time, and with increased exposure to the elements, untreated pieces of concrete may fall from your structure. The risk is it falling and damaging property, or even worse, hitting a person walking below.

The causes of concrete cancer

There are a number of reasons your building may have spalling concrete. The more common reasons include:

  • A poorly poured substrate which has allowed moisture to seep into it through cracks and voids
  • Inadequate preparation of the reinforcing steel when the original concrete was poured.
  • The ends of the reinforcing are too close to the surface. In heavy rains, water may seep through causing lime and other chemicals in the steel to oxidise.
  • Incompatible metals being used in close proximity to each other, thus causing a reaction which allows water into the slab
  • Stress fractures from bearing weight or general wear-and-tear allow water to penetrate the concrete and react with the steel

For more information, or to speak with one of our concrete spalling specialists, please contact the Remedial team.

CONTACT US

WE'RE HERE TO HELP

Contact us for more information and to arrange a quote.

CONTACT US

WHAT YOU SAID

LATEST NEWS

Stay up to date on the latest thoughts, trends and news in building repair and maintenance

delays to undertaking repairs can lead to complications, increased repair costs (because things get worse) and lead to longer repair times as the damage is more extensive
What is Deferred Maintenance: Why Time is a Factor in Repair Work

30 November 2021. By Jeff Anderson

The problem as regards the absence of consistent, proactive repairs, is that funds end up being diverted to the increased costs associated with deferred maintenance each year. In this blog I break down why attending to repairs early is clever business.

Our safe-work approach is lead by management
The Importance of Building Site Safety

16 November 2021. By Lorna

At Remedial we understand that poor health and safety procedures at a site lead to a range of negative consequences. Human safety is our primary concern, however, the impacts of poor workplace safety extend much further than just the effect on people.

Learn more about HBCF and iCare insurance
What is HBCF? What you need to know

1 November 2021. By Jeff Anderson

In the last 20 years or so, we have noted a rise in the number of projects we are contracted to do under insurance - specifically HBCF claims. But what is the HBCF and what do you need to know? I cover it off in this article.