Corrosion is a significant concern for reinforced concrete structures, especially in environments exposed to harsh elements. To combat this issue and extend the lifespan of concrete, corrosion-inhibiting admixtures have been developed. There are different types of admixtures, however, with different functions.

So, let’s take a closer look at some of the corrosion inhibitor admixtures for concrete structures. We’ll explore their different types, functions, and the benefits they offer in protecting structures from corrosion.

Types of Corrosion Inhibiting Admixtures for Concrete Structures

Corrosion inhibiting admixtures are available in various forms, but their primary function remains the same – to prevent or mitigate the corrosion of steel reinforcement within the concrete. The different types of corrosion inhibitors in concrete structures can be divided into organic and inorganic, each with three commonly used formulations.

Organic Corrosion Inhibitor Concrete Admixtures

  • Amine-Based Inhibitors: Amine-based corrosion inhibitor concrete admixtures function by adsorbing onto the surface of the rebar and forming a protective film, which acts as a barrier against corrosion.
  • Fatty Acid-Based Inhibitors: Fatty acid-based corrosion inhibitors are organic molecules that form a protective layer on the steel surface, preventing the penetration of corrosive substances such as chloride ions.

The main difference between amine-based and fatty acid-based corrosion inhibitors lies in their chemical composition and the way they create the protective barriers. Amine-based inhibitors rely on nitrogen-containing compounds, whilst fatty acid-based inhibitors use long-chain carboxylic acids.

  • Bipolar Concrete Penetrating Corrosion Inhibitors: Bipolar concrete penetrating corrosion inhibitors, also known as polarisation inhibitors, are a unique category of organic inhibitors. They alter the electrochemical behaviour of steel reinforcement, making it more resistant to corrosion.

Inorganic Corrosion Inhibiting Admixtures

  • Calcium Nitrite-Based Inhibitors: Calcium nitrite is one of the inorganic corrosion inhibiting admixtures used in concrete. It works by blocking the penetration of chloride ions and promoting the formation of a protective layer on the steel rebar.
  • Zinc-Based Inhibitors: These inhibitors function by sacrificially protecting the steel rebar. When corrosion occurs, zinc sacrificially corrodes instead of the steel, preserving the integrity of the reinforced concrete structure.
  • Silicate-Based Inhibitors: These inhibitors form a gel-like protective layer on the rebar’s surface. This layer acts as a barrier against corrosive agents and helps reduce the corrosion rate.

Functions of Corrosion Inhibitor Admixtures For Concrete Structures

Now, let’s take a look at how these corrosion inhibitor admixtures for concrete structures function and the specific benefits they offer in protecting concrete structures.

  • Prevents Chloride Attack: Corrosion inhibiting admixtures act as a shield against chloride ions, which are a major contributor to the corrosion of steel reinforcement.
  • Prevents Corrosion: Corrosion inhibitors prevent or inhibit the corrosion of steel reinforcement within the concrete by creating protective barriers or altering the electrochemical behaviour of the steel.
  • Extends Service Life: Admixtures help maintain the service life of concrete structures by preventing corrosion-induced cracking and spalling.

Benefits of Corrosion Inhibitor Concrete Admixtures

Here are five of the key advantages of corrosion inhibitor concrete admixtures.

  1. Cost Savings: Corrosion inhibitors save time and money by extending the service life of concrete structures and reducing the need for repairs.
  2. Increased Safety: Corrosion inhibitors help reduce corrosion-related structural failures, ensuring the safety of the structures and the people who use them.
  3. Sustainability: Eco-friendly inhibitors align with sustainability practices, lowering the environmental impact within the construction industry.
  4. Maintenance Reduction: Structures treated with corrosion inhibitors require less frequent maintenance, resulting in less disruption and inconvenience.
  5. Long-Term Performance: Corrosion inhibiting admixtures contribute to the long-term performance and reliability of concrete structures, making them a wise investment.

Preserving Concrete Structures with Corrosion Inhibitors

Corrosion inhibiting admixtures are a vital tool in the construction industry, helping to safeguard concrete structures against the damaging effects of corrosion. If you want to implement corrosion inhibitors in your construction projects, don’t hesitate to contact us. Give us a call today and take the first step toward corrosion-free concrete!


Are corrosion inhibitors suitable for all types of concrete structures?

Corrosion inhibitors are versatile and can be used in various concrete structures, including bridges, parking garages, and buildings, to protect them from corrosion.

How long does the protection from corrosion inhibitors last?

The longevity of corrosion protection depends on factors like the type of inhibitor used, environmental conditions, and the quality of the application. However, corrosion inhibitors can extend the service life of structures by many years.

Are corrosion inhibitor admixtures safe for the environment?

Many corrosion inhibitors are environmentally friendly and pose no harm to the environment. It’s essential to choose the right type of inhibitor based on the project’s specific requirements – call us for more information.