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Vishal Engineers & Galvanizers is the first company in Gujarat to introduce Hot-Dip Galvanized Reinforcement Steel Bars (Galva Rebars), as a readily available standard product. Alternatively, we also undertake job-work of Hot-Dip Galvanizing of M.S. Reinforcement bars (T.M.T. Bars).
The rebars are galvanized according to the IS – 12594 – 1988 standards. The product is being regularly supplied to the prestigious projects like Sabarmati River Front Project.
Why Galvanized Rebar?
Major Benefits of Galvanized Rebars
Bond Strength
| Why Galvanized Rebar? |
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Corrosion products of steel are over three times the volume of original steel. |
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Higher volume of corrosion products exerts greater tensile disruptive stress on the surrounding concrete. |
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The structure would have spalling on concrete, suffer loss of durability and serviceability, and would require early remediation, repair and even demolition. |
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Corrosion of steel reinforcement bars is a key reason for damage to concrete. |
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Many regions in India accounting for 20-25% of rebar use require corrosion protection that is not provided by the concrete cover. |
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Of the several corrosion protection technique tried and tested over long periods, galvanized reinforcement bar have emerged technically superior and cost effective. Further galvanized reinforcement bars are economical. |
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Galvanization increases reinforcement bar life by more than 300%. |
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| Major Benefits of Galvanized Rebars |
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Protection to the steel during storage and construction, prior to placing the concrete. |
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Diminished effect of variations in concrete quality. |
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Safeguards against poor workmanship, especially misplacement of reinforcement, poor compaction and inadequate curing. |
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Delayed initiation of corrosion and the onset of cracking. |
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Reduced likelihood of surface staining. |
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Increased structural life of concrete, particularly where chloride contamination is likely. |
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Chloride ion concentration required to start corrosion of zinc on galvanized release is 3 times the threshold concentration for plain rebars. |
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Zinc corrosion products do not damage concrete but block pores in concrete, reducing the chloride ion diffusion. |
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Zinc provides cathodic protection even to areas that become uncovered due to zinc corrosion. |
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Zinc does not allow contact between chloride ions and steel. |
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Bond Strength
| Galvanized reinforcing bars show equal or better strength in all conditions in both plain and deformed types. |
- Structural Engineering Materials Laboratory
University of California |
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| Tests performed on Galvanized Reinforcements |
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Technical Studies on Galvanized Rebars - Torsteel Research Foundation in India |
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The tests were done to analyze the relative performance of galvanized rebars in comparison with uncoated rebars. The tests conclusively prove that in terms of corrosion protection galvanized rebars have merged highly superior to uncoated steel. At the same time the bond strength and bending properties remained unaffected. |
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Tests by IIT Mumbai |
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The investigations clearly showed that the galvanized and galvanized chromate reinforcement resulted in a several fold increase in the corrosion resistance capability compared to the plain black steel. It was also observed that an improvement in the grade of concrete has improved the corrosion resistance significantly. |
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Central Electrochemical Research Institute (CECRI) in Karaikudi, India |
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Galvanized and galvanized chromated performed better than black in every set of test and under all conditions.
Galvanized and chromated performed better in most environments. Galvanized specimens seem to perform best in rich (M30) concrete with no chloride contamination while galvanized and chromated performed best in lean (M15) and in contaminated (1% Chloride) concrete. |
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CINVESTAV Final Report |
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The study shows that zinc can be used to protect reinforcing bars from corrosion in tropical marine environments by using local materials and also that this application can be monitored using local resources. |
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Source & For further details: www.galrebars.com
Hindustan Zinc Ltd |
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| Quick Contact: +91-2717-250255 |
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© 2006 Vishal Engineers & Galvanizers. All rights reserved |
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