What are corrosion-inhibiting admixtures? Well, it’s no surprise that concrete is the backbone of modern infrastructure, so protecting it from corrosion is crucial for maintaining the structural integrity and longevity of buildings, bridges and concrete structures.

Addressing concrete corrosion is even more critical in Australia, where diverse environmental conditions range from humid coastlines to arid interiors. That’s where corrosion inhibitor admixtures for concrete come into the picture because these inhibitors help protect our concrete from losing its integrity.

Let’s look at corrosion inhibitor concrete admixtures, their types, and their functions so you know which ones are best suited to your project.

What are Corrosion Inhibiting Admixtures?

Corrosion inhibiting admixtures are chemical solutions added to concrete mixtures to prevent or slow down the corrosion of steel reinforcement within concrete. These inhibitors form a protective layer around the steel reinforcement, thus shielding it from corrosive elements such as water, chloride, and oxygen.

Types of Corrosion Inhibitors in Concrete

There are several types of corrosion inhibitors in concrete that offer unique benefits for specific types of projects. These include sodium nitrate, calcium nitrate, lithium nitrate, sodium monofluorophosphate, sodium phosphate, and potassium chromate.

  • Sodium Nitrite: This inhibitor forms a protective oxide layer on the steel, reducing the risk of chloride-induced corrosion. It’s effective but requires precise dosing to avoid adverse effects on the concrete.
  • Calcium Nitrite: Popular in Australia, calcium nitrite acts as a corrosion inhibitor and a set accelerator. It’s particularly effective in coastal areas where chloride is a significant concern. It’s also known as a calcium nitrite corrosion inhibitor.
  • Lithium Nitrate: Known for its ability to mitigate alkali-silica reactions, lithium nitrate also provides corrosion protection and is ideal for environments with fluctuating temperatures.
  • Sodium Monofluorophosphate: This inhibitor protects steel rebar and maximises the concrete’s structural integrity. It’s suitable for structures exposed to harsh environmental conditions.
  • Sodium Phosphate: Effective in environments with a high risk of acid rain, sodium phosphate helps maintain the pH balance in concrete, protecting the steel reinforcement.
  • Potassium Chromate: Although less commonly used due to environmental concerns, potassium chromate is effective in specific applications where other inhibitors might not be suitable.

What are Bipolar Concrete Penetrating Corrosion Inhibitors?

Bipolar concrete penetrating corrosion inhibitors, for example, sodium monofluorophosphate in the above list, are designed to deeply infiltrate concrete, forming a protective layer around the steel rebar. This unique mechanism significantly reduces corrosion risks, ensuring enhanced durability and longevity of concrete structures. Bipolar concrete penetrating corrosion inhibitors are used in marine environments, coastal areas, and infrastructure projects, where challenging conditions make steel reinforcement particularly vulnerable to corrosion.

Benefits of Corrosion Inhibitor Concrete Admixtures

Corrosion inhibitor concrete admixtures provide several advantages:

  • Structures are less prone to degradation, ensuring they last longer.
  • The need for frequent repairs is reduced, saving money in the long term.
  • The risk of structural failures due to concrete corrosion is significantly reduced.
  • Inhibitors help to reduce environmental impacts by prolonging the life of the structures and reducing the need for new materials.

Corrosion Inhibitor Admixtures For Concrete – Environmental Stewardship

Protecting our existing infrastructure becomes increasingly important as we look towards building a sustainable future. The availability of corrosion inhibitor admixtures for concrete structures plays a vital role in this process, offering a practical and efficient solution to a pervasive problem. Incorporating corrosion inhibiting admixtures into concrete structures is a technical necessity and a commitment to safety, economy, and environmental stewardship.

Why Invest in Corrosion Inhibiting Admixtures?

Understanding and implementing effective corrosion protection methods is critical for maintaining the health of concrete structures. Using corrosion inhibiting admixtures, each with unique properties and benefits, ensures that structures can withstand the test of time and harsh environmental conditions. It’s an investment in safety, durability, and sustainability.

If you want to maximise the durability of your concrete structures against corrosion – Contact the team at SPG Go Green or call us for expert advice on the best corrosion inhibitor concrete admixture solutions for your next project.


Can corrosion inhibiting admixtures be used in all types of concrete structures?

Yes, corrosion inhibiting admixtures are versatile and can be used in a variety of concrete structures, including bridges, buildings, and marine facilities. However, the choice of inhibitor depends on the specific environmental conditions and structural requirements.

How long do corrosion inhibiting admixtures last in concrete?

The longevity of corrosion inhibiting admixtures in concrete varies depending on the type of inhibitor and environmental conditions. Generally, they provide long-term protection, but periodic assessments are recommended to ensure ongoing effectiveness.

How do corrosion inhibiting admixtures enhance the longevity of concrete structures?

Corrosion inhibiting admixtures either form a protective layer over the steel or alter the chemical reactions that lead to corrosion, ensuring that the structural integrity of the concrete is maintained over longer periods.