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When exposed to harsh conditions including high humidity, chlorides, and atmospheric CO2, concrete buildings deteriorate with time, and this deterioration happens considerably more quickly. Through the process of diffusion, moisture infiltration as well as the entry of harmful materials like CO2, chloride ions, and other chemicals into the concrete pores causes the reinforcement to corrode, which in turn damages the reinforced concrete structures.
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Introduction When exposed to harsh conditions including high humidity, chlorides, and atmospheric CO2, concrete buildings deteriorate with time, and this deterioration happens considerably more quickly. Through the process of diffusion, moisture infiltration as well as the entry of harmful materials like CO2, chloride ions, and other chemicals into the concrete pores causes the reinforcement to corrode, which in turn damages the reinforced concrete structures.
Continued …. An acknowledged technique for extending the service life in such a harsh environment is to protect RC structures with an appropriate protective coating. Without a protective coating, embedded steel reinforcement will corrode quickly and cause RC structures to degrade quickly. Anti-carbonation coating fills this need. Surface treatments with strong carbon dioxide resistance are known as anti-carbonation coatings. They serve as a carbon dioxide barrier to prevent carbonation of concrete.
Advantages of Anti- Carbonation Coatings • These coatings are good barriers against the attack and penetration of water, sulphates, chloride ions, and carbon dioxide. • The covering shields the buildings from the harmful sea and coastal surroundings. • They offer high film build-up and strong adherence to substrate. • They also offer excellent resistance to fungi and algae.
Anti-Carbonation Coating – Method of Application • Preparing the Surface of New Concrete Surfaces A minimum of 6 to 8 weeks must pass after installation of new concrete or plaster before coating is applied. Entrapped moisture will press on the coated membrane unless sufficient curing is done. All surfaces must be dry, clean, and free of debris, grease, oil, and other substances. In order to remove debris and dust that could interfere with the aesthetic effect and coating bonding, the concrete surface should be thoroughly washed with water.
B. Preparing the Surface of Previously Painted Surfaces If there is any alkyd paint present, it should be properly sanded to eliminate all loose particles. The best techniques are mechanical. Cement paint-coated exterior surfaces need to be wire-brushed, thoroughly cleaned with water, and then allowed to dry. Prior to the application, the area should be treated with the appropriate biocide solution to guarantee that all traces of fungus and algae have been eliminated. All cracks need to be properly repaired with elastomeric sealant or other materials.
C. Priming Primer should be applied by brush or spray, diluted in a 2:1 ratio with mineral turpentine to promote better bonding and surface finish. Before applying the finishing coat, it should be given a minimum of two to three hours to dry. D. Finishing Coat When the first layer has had time to dry for 5–6 hours, it should be followed by two neat coats of anti carbonation coating.
E. Precautions & Limitations Although there should be a 5- to 6-hour interval between the two coatings, the drying period may be prolonged in cold or humid locations. Before usage, the coating products should be thoroughly stirred. When the outside temperature is below 10°C, application should not be done.
Applications of Anti – Carbonation Coatings Bridges, flyovers, subways, underpasses, parking garages, tunnels, chimneys, industrial buildings, stadiums, and RCC water tanks all use anti-carbonation as a protective and ornamental coating. Additionally, any cementitious exterior masonry surfaces that are plastered and concrete constructions that are exposed to the harsh weather conditions. Additionally, all thin RCC structures with less covering, including facades and fins, are other sites where anti-carbonation coating is used.
Conclusion It is nearly impossible to prevent carbonation from occurring in reinforced concrete and masonry, and it starts as soon as the substrate is exposed to the environment. Alkalinity is lost in the concrete as a result of the atmosphere's carbon dioxide reaction, and the reinforced steel corrodes. Different anti-carbonation coatings work to resist this and keep your buildings looking good while preventing later, expensive repair and maintenance work. Caparol Arabia offers anti carbonation coating paints which is most trusted in the Middle East.
