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Shyam TMT Re-Bars- CRS

The preferred Armour for long-life construction

Corrosion - The silent menace

Corrosion is the oxidation of a metal in a normal atmospheric condition owing to the excessive presence of moisture and oxygen in the air. Corrosion of the metal is a very natural and rapid phenomenon in areas of high humidity, places close to the sea or in the presence of saline water. Gaseous emissions in industrial area also cause corrosion of the metal.

Corrosion is the greatest, silent menace that can destroy the toughest and best built structure in the world like Buildings, Bridges, Dams, Chimneys, Jetty, Industrial Plants, Port establishments etc.

When the concrete is freshly cast, it contains high ph value (ph value - 12-13). This creates a protective passive oxide layer over the steel surface, preventing it from corrosion. Gradually, with constant ingress of oxygen, water, chlorides, carbon dioxide etc. the ph value of the concrete reduces to below 8 causing the decay of the protective layer. The Chloride ions also attack the passive layer on the metal surface exposing it to oxygen and moisture. Once the passive layer is broken the electrochemical reaction of corrosion progress unimpeded.

The impact of Corrosion on Steel - Re-Inforced Concrete

Any construction of permanent nature requires concrete with steel reinforcement. The 'durability' of concrete depends on its impermeability to water, oxygen, carbon dioxide, chlorides, sulphates etc. these elements corrode and weaken the reinforcement bars embedded in the concrete.

Efforts to control corrosion led to Galvanized and Epoxy coated reinforcement bars- but failed in practical usage due to the risk of disbonding and holidays, causing accelerated corrosion. The solution was to take a new metallurgical route- controlled composition, alloying with anti-corrosion elements, and improved production processes that would give the steel bars inherent corrosion resistant properties.

Shyam CRS TMT Re-Inforcement Bars - Meeting the Challenge

Corrosion resistant elements such as copper, phosphorous and chromium are added in appropriate measures to the hot metal for manufacturing CRS Billets. At the Rolling Stage, the advanced Thermex Technology complements the route. The CR elements together with tempered martensite outer surface stops the corrosion of Re-Bars.

Physical Properties:

Chemical Properties:

Features:

Apart from the general features of Shyam TMT-Re-Bars, the special features of CRS TMT Re-Bars are as follows:

Special Corrosion Resistant properties of Shyam CRS TMT Re-Bars:

Shyam CRS TMT Re-Bars have been exposed to very rigorous corrosion mediums and evaluated for various corrosion resistant properties as per ASTM standard viz. Immersion Test, Salt Spray Test, Exposure Test, Dioxide Test and Dynamic Test. The result of such corrosion tests indicated that Shyam CRS TMT Re-bars are having corrosion resistant index (CRI) of 1:7min as compared to CRI of normal TMT Re-Bars.

Corrosion resistance index (CRI ) of SHYAM CRS   Type of Test Non CRS TMT CRS TMT Potentio Dynamic Test 1.0 2.35 Salt Spray Test 1.0 1.59 Sulpher- Dioxide Test 1.0 1.68 Alternate Immersion Test 1.0 1.92

Certification:

Shyam CRS Re-Bars have been tested at a number of reputed national institutes like IIT Kanpur and National Test House (Kolkata) under actual service conditions. The field data obtained in actual service condition tests, demonstrate genuinity of Shyam CRS TMT Re-Bars compared to ordinary TMT Re-Bars.

Advantages:

1.    No extra precaution required in material handling and transportation.

2.    No extra preparation for storage or working at site.

3.    No maintenance during fabrication.

4.    Workable at poor site conditions.

5.    Life Span Cost Benefit.

6.    No extra precaution during welding.

Applications:

Shyam TMT-CRS Re-Inforcement Bars are best applied at:

• Oil & Gas Exploration sites. • Bridge & Dam Construction. • Highway & Flyover Construction. • Sea Port Construction. • Jetty Construction. • Terminal Construction. • Thermal & Hydel Power Station Construction. • Industrial Structures. • Hazardous Area Construction.

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