Steel is a strong and versatile material, with an excellent cost-benefit ratio in a variety of industrial uses and civil construction. One of the main concerns of the specifications are its susceptibility to corrosion, including in internal environments. This guide contains the essential information, in a practical and objective manner, needed by architects, engineers and professionals in general to specify a protection system against corrosion in terms of environmental and economic sustainability– Hot Dip Galvanizing.Versíon en Español
The mechanical resistance of steel, allied with the resistance to corrosion of zinc, makes the galvanized product a versatile and economic means for a variety of uses. Hot dipped galvanizing, also known as fire galvanizing, consists of dipping steel or cast iron in a bath of cast zinc, forming a zinc coating and Fe-Zn alloys, whose characteristics and advantages are summarized in this publication.
Reinforced concrete is one of the most used building materials. It has a cost-effective, easily available and has a range of properties and characteristics that make it convenient for many applications. However, the reinforced concrete structures are exposed to different environmental conditions, which in many cases highlights one of its main weaknesses: the susceptibility of steel rebar corrode, resulting in stains, cracks and even the concrete overlay, causing loss of mechanical properties.
Reinforced concrete is one of the most widely used modern construction materials. It is cheap, easily available, has a variety of attractive properties and characteristics and is appropriate for different uses in construction and buildings. It is also used in many exposition conditions, which sometimes highlights one of the main deficiencies of reinforced concrete: the potential for the reinforcement of the steel (beam) to undergo corrosion, resulting in discoloration, cracks and failure of the surrounding concrete. For over 50 years, zinc coatings obtained from hot dipped galvanizing have been used around the world to protect the beams from corrosion, in an economical and effective way.
Zinc alloy pressure die casting is a unique choice for many functional and decorating uses. Zinc is a relatively dense metal, with excellent durability. Zinc alloys for pressure die casting are also more mechanically resistant than the majority of other materials, except for some reinforced polymers. The hardness and dimensional stability of zinc alloys make them appropriate for work in mechanical components, like gears, which would not last as long if they were shaped in polymers. Zinc can be pressure die cast at low temperatures, saving energy and processing, compared to other metals and engineering alloys.
A zinc deficiency, in both humans and plants, has been recognized for years as a critical problem by nutritionists, doctors, scientists and agronomists. Recently, it has also received growing attention by other groups, including economists and social scientists, with the recognition that this is a global nutritional problem with significant implications for health, society and economics. It is estimated that almost half of the human population has a zinc deficiency, leading to many health complications, including harm to the immunological system and to mental functions.
This paper presents an overview of the characteristics and use of galvanized reinforcement in concrete construction. It is provided to supplement the presentations in the Workshop – More Durable Concrete Structures using Hot Dip Galvanized Reinforcing Steel supported by the International Zinc Association, the United Nations Common Fund for Commodities and the International Lead Zinc Study Group.Versíon en Español