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01638 APPLICATIONS OF GALVANIZED REBAR IN REINFORCED CONCRETE STRUCTURES

Picture for 01638 APPLICATIONS OF GALVANIZED REBAR
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Product Number: 51300-01638-SG
ISBN: 01638 2001 CP
Author: S.R. Yeomans
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An overview is presented of the characteristics and performance of galvanized steel reinforcement in concrete. Galvanizing produces a tough and adherent iron-zinc alloy layer coating which is metallurgically bonded to the base steel. It resists abrasion and fairly heavy handling, and can generally be fabricated without substantial damage to the coating and with little or no effect on its corrosion resistance. Galvanized rebar can be treated in much the same way as conventional black steel bar and the same design criteria as used for black steels can be used with galvanized steels. No product-specific design practices are necessary and no special training of the construction workforce is necessary. When embedded in concrete, galvanized steel has a substantially higher chloride threshold than black steel and totally resists the effects of carbonation of the concrete. The net result of these effects is that galvanizing delays the initiation of the corrosion process and extends the life of the concrete structure or element. However, the extent of this life extension depends to a large extent on the quality of the concrete used and the severity of the environment to which it is exposed. Once corrosive attack on the zinc alloys has commenced, barrier-type protection is afforded during the life of the coating. Where small regions of the underlying steel are exposed, sacrificial protection of the zinc is afforded to the exposed steel. The results of field and experimental studies to assess the performance of galvanized rebar compared to black steel are presented and examples given of types of concrete structures that have been reinforced with galvanized steel. Keywords: galvanizing, rebar, concrete, corrosion, corrosion protection, economics
An overview is presented of the characteristics and performance of galvanized steel reinforcement in concrete. Galvanizing produces a tough and adherent iron-zinc alloy layer coating which is metallurgically bonded to the base steel. It resists abrasion and fairly heavy handling, and can generally be fabricated without substantial damage to the coating and with little or no effect on its corrosion resistance. Galvanized rebar can be treated in much the same way as conventional black steel bar and the same design criteria as used for black steels can be used with galvanized steels. No product-specific design practices are necessary and no special training of the construction workforce is necessary. When embedded in concrete, galvanized steel has a substantially higher chloride threshold than black steel and totally resists the effects of carbonation of the concrete. The net result of these effects is that galvanizing delays the initiation of the corrosion process and extends the life of the concrete structure or element. However, the extent of this life extension depends to a large extent on the quality of the concrete used and the severity of the environment to which it is exposed. Once corrosive attack on the zinc alloys has commenced, barrier-type protection is afforded during the life of the coating. Where small regions of the underlying steel are exposed, sacrificial protection of the zinc is afforded to the exposed steel. The results of field and experimental studies to assess the performance of galvanized rebar compared to black steel are presented and examples given of types of concrete structures that have been reinforced with galvanized steel. Keywords: galvanizing, rebar, concrete, corrosion, corrosion protection, economics
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01428 INSPECTION OF HOT DIP GALVANIZED ARTICLES

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05262 Performance of Galvanized Reinforcing Steel in Carbonated Concrete Specimens

Product Number: 51300-05262-SG
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