Role of Concrete Admixtures in Preventing Corrosion

Posted on: January 25, 2024

As one of the most popular materials utilized in the world after water, concrete is produced approximately 10 billion tons yearly. However, the popularity of concrete does not hide the significant issues in its structures, and one of them is its susceptibility to corrosion caused by mesh and steel bars.  

Due to exposure to substances like oxygen, hydrogen, bacteria, or even extreme pressure, material degradation happens gradually by corrosion. It damages any affected material severely, concrete being one of them.  

With the use of corrosion-inhibiting chemical admixtures, one can avoid concrete corrosion. In this blog you will get to know how the various chemicals will successfully prevent corrosion in concrete structures.  


Concrete Corrosion and its Effect on Infrastructure 

The first thing to comprehend before understanding the role of any admixture is to know how corrosion occurs in the structures. Steel reinforcement is fit inside the concrete for strength that leads to corrosion when exposed to environmental factors like air and moisture.  

The gradual chemical reaction of moisture and air with steel forms rust. Further, the rush inside takes up more space, causing the concrete to crack and eventually lead to structural damage and failure of the process, becoming a significant safety concern.  


Role of chemical admixtures in stopping corrosion 

Concrete admixture manufacturers worldwide produce a type of component called corrosion inhibitors to prevent the degradation of concrete. These inhibitors form a protective film on the surface, preventing substances like sulfates, chlorides, and CO2 from penetrating the concrete.  

It slows the rusting process, protecting the steel reinforcement since moisture and oxygen deposition effectively reduces the steel.  

The various corrosion inhibitors added to the concrete mix include organic, inorganic, and mixed inhibitors. Out of these, organic compounds or inhibitors get absorbed on the steel surface, acting as a layer of protection.  

However, inorganic inhibitors are inorganic salts that create a passive film on the steel surface. The combination of organic and inorganic inhibitors is a mix of inhibitors that improve concrete’s durability and water resistance, reducing costly repairs and maintenance.  

They are user-friendly, economical, and contribute to minimizing the environmental and time-related effects associated with repairs and replacements. 

Using chemical admixtures in an array of concrete structures is an effective and cost-efficient solution to improve the durability and longevity of structures. As the industry continues to raise its demand for sustainable construction practices, chemical admixtures will keep playing a crucial role in preventing corrosion in the best possible way.  

The strategic use of concrete admixtures is crucial in preventing corrosion in reinforced concrete structures. By enhancing durability, reducing permeability, and mitigating the impact of aggressive environmental factors, these admixtures contribute significantly to the long-term integrity and sustainability of concrete infrastructure, ultimately extending the service life of constructions and minimizing the risk of corrosion-related damage. These admixtures contribute to reduced permeability, improved resistance to aggressive environmental elements, and enhanced overall performance, thereby ensuring the longevity and integrity of concrete constructions. Vinati Organics, a leading manufacturer of concrete admixtures in India, presents Vinplast-245 chemical admixture designed to improve the workability of cement. For further information, get in touch with us.