By Pavan Kaushik
Coastal salts (i.e. sodium, calcium and magnesium chlorides) can create a corrosive environment for any infrastructure across the world, the reason being humid and saline climate. The only remedy is to use galvanized steel (the zinc coated steel) that provides the much needed strength to the rebars.
Lotus Temple in Delhi
Using galvanised steel, Delhi’s Lotus Temple structure has been built to last for 1000s of years. Lord Krishna’s temple being built in Vrindawan has approached Hindustan Zinc for providing Zinc to build ever-lasting infrastructure. The youngest State of India, Telangana, while celebrating its 2nd anniversary, hoisted the tallest National Flag Mast, that has a coating of zinc.
Importance of Galvanizing in Infrastructure
India loses around 4-5% of GDP annually on account of corrosion losses. Western countries, which are far ahead of us in terms of infrastructure, mandate the use of Galvanizing for the steel structures used for bridges, highways, public utility, Airports, Metro Stations, Railways stations, etc. and that is how they are able to preserve long-lasting and robust structures.
Benefits of Galvanized Steel in Bridges
For instance, Athens Bridge Pennsylvania & Curtis Road Bridge Michigan are structures that utilize Galvanized Steel rebars and have a much longer life-span than the conventional bridges built with normal black steel rebar, as galvanized rebar can withstand chloride concentration at least four to five times higher than the black steel rebar and remains passivated at lower pH levels, substantially slowing the rate of corrosion.
Corrosion and Structural Integrity
The fundamental says, once the steel starts corroding, the mass of the steel increases, leading to cracks in the structure, which could later become reasons for collapse.
Coastal Infrastructure and Galvanization
The coastal infrastructure within a range of 3000 sq feet are more prone to corrosions. According to The American Institute of Architects, it is essential to use hot dip galvanized steel, to make such coastal infrastructure decay resistant.
About the author
Pavan Kaushik heads Corporate Communications at Hindustan Zinc
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