Because of its versatility, concrete is a great choice for all types of building projects. When installed correctly, it can last a long time, but it’s not completely resistant to wear and tear. With time, untreated concrete can start spalling. But why does this happen, and who do you call? Let’s take a look at what concrete spalling Sydney means and what causes it.
What Is Concrete Spalling?
We use the term spalling to describe concrete that has cracked and delaminated from the substrate, which exposes the rebar. The cracking can start out small, only affecting a single section of the concrete. Over time, it can take over the entire concrete slab, affecting the building’s foundation and structural integrity.
What Causes Concrete Spalling?
While some of the most common causes include the free-thaw cycle and the use of deicing salts, Sydney properties are exposed to concrete spalling for other reasons. These include:
Low-Quality Concrete
Concrete can last decades when it’s manufactured and maintained properly. However, when the concrete mix isn’t made using proper ratios at the factory, it can cause a host of problems over the course of its lifespan, which includes spalling. This usually happens when concrete lacks enough Portland cement, which gives it that robust strength. Concrete ratios without enough Portland cement can lead to spalling.
Corrosion of Embedded Reinforcing Steel
When reinforcement bars corrode, the rust takes up more space than the steel. This extra volume results in pressure and, consequently, concrete spalling. This process is sped up in the process of saltwater due to the presence of dissolved ions, which cause steel to corrode even faster.
Fire Exposure
Because concrete is porous, it’s not resistant to moisture. Water on the surface and inside the concrete turns to steam during fire exposure. This causes expansive pressure that results in spalling. It’s also prone to internal cracking due to the difference in thermal expansion between cement paste and aggregate.
Poor Preparation
When substrate is poured improperly, it allows moisture to seep through existing cracks in the concrete. Similarly, reinforcing steel that’s not prepared properly or is positioned too close to the surface is also a cause for concrete spalling Sydney.
Use of Incompatible Materials
When incompatible metals are used in close proximity to each other, it can result in a reaction that allows water to enter the slab. Over time, this water can cause deeper fractures and worsening problems of concrete spalling.
Stress Fractures
Gradual wear and tear, as well as excessive loads, can lead to stress fractures in the concrete. These allow water to seep into the concrete and react with the steel.
Inefficient Waterproofing
Despite its strength, concrete’s porous nature means that moisture eventually reaches the reinforcing steel bars. Without appropriate waterproofing, reinforcing bars are at risk of corrosion. This results in an outward pressure on the concrete, contributing to cracking and spalling.
What Happens If You Don’t Fix Concrete Spalling
If you address concrete spalling as soon as possible, it won’t compromise your building’s structural integrity. However, failing to make timely repairs can cause cracks to spread and widen, weakening your building’s structure and making it unstable.
With time, this can result in extensive damage that makes your property unsafe and unattractive. Spalling can be dangerous due to the risk of falling debris and trip hazards. Then, there are commercial considerations as well because structural deterioration can diminish the value of an asset while increasing the cost of repairs.
That’s why it’s important to be on the lookout for warning signs of spalling, such as flaking, crumbling, or cracking concrete, and addressing them with help from a professional. Other signs you can look for include rust stains and leaks in your roof or walls.
Say Goodbye To Concrete Spalling
Once your concrete starts spalling, preventative measures won’t work until you’ve repaired the areas with problems like cracking. Don’t worry, though, because, with professional remedial building services, you can restore your Sydney property to its former glory.
Whether your concrete has started spalling due to low–quality concrete, saltwater exposure, or improperly poured aggregate, we have the skills and equipment to help! Our team uses industry best practices and years of experience to deliver exceptional services that improve your property’s longevity. Don’t hesitate to get in touch with our team today and get a free quote on our services.