When it comes to concrete structures, corrosion is a deadly enemy. Wherever there is humidity, corrosion sets steadily and destroys slowly, attacking houses, bridges, dams, industrial plants and just about any construction that has used concrete reinforced with steel.

Coastal breezes, seawater, saline subsoil, brackish ground water and gaseous emissions in industrial regions, work round the clock to destroy concrete structures ruthlessly and indiscriminately.A bridge near Mumbai which collapsed within 10 years of its being built is an example. Buildings beside a river near New Delhi too, have not been spared and have a reduced life span today.

Various methods of fighting corrosion have been developed. These include use of cement slurry coated rebars, galvanised rebars and epoxy /coated rebars. However, many of these products are fraught with the danger of disbondment, and flaws before and during embedding, leading to accelerated corrosion. The only practical solution is a cost effective steel, having its composition controlled to impart intrinsically improved corrosion resistance properties, reducing the rate of corrosion from the time of construction, and thus, lengthening the life of the structure.

Tata Steel, pioneers in rebar technology made a breakthrough when they developed corrosion resistant steel rebars. It took years of research and trials to lead to something that would strike the optimum balance between the life of a structure and its cost.

TISCON CRS was the answer, the silent sentinel that would keep corrosion at bay and protect the life of concrete structures. When freshly cast, concrete (pH = 12-13) is a highly alkaline material and the embedded steel is protected by a passive oxide layer. Gradually, carbonation and chlorination break down the natural passivating protection of steel. In fresh concrete about 7500 to 8000 ppm chloride ions start corrosion. However, when alkalinity reduces, the chloride level needed to start corrosion is lowered to below 100 ppm.

TISCON CRS rebars in Fe 500 grade, produced through the TMT route are available in the range of 8 to 40 mm.

Quenching & Self-tempering Temperature Profile