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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Surface Applied Corrosion Inhibitor
Author(s): T. A. Burge
Publication: Special Publication
Appears on pages(s): 381-398
Keywords: concrete; durability; corrosion inhibitor
Abstract:Durability limitations of steel reinforced concrete are well documented. Corrosive environments (e.g. the presence of chlorides), carbonation of concrete structures, poor workmanship and other factors can cause corrosion of the reinforcing steel. Normally, reinforcing steel embedded in concrete is protected because the concrete cover acts as a barrier and the high pH value of the pore fluid assures a passive state. Both the presence of chloride ions at concentrations above a given threshold level and carbonation can put reinforcing steel into an active state and result in corrosion rates that markedly decrease the expected service live of reinforced concrete structures. Aqueous surface-applied corrosion-inhibiting impregnations are featuring the ability to reduce the corrosion rate of corroded steel reinforcement embedded in hardened concrete due to their corrosion-inhibiting action and in the case of a carbonated concrete structures by realkalization. Additionally the corrosion rate is further reduced due to the water repellent action of organosilicone compounds. The careful selection of hydroxyalkylamino compounds as well as of inorganic-or organic acid compounds allows the formulation of corrosion-inhibiting impregnations with high buffer capacity. When applied on the surface of a concrete structure, said corrosion-inhibiting compositions are capable of penetrating into the concrete, and raising the pH value of the pore fluid in the vicinity of the reinforcing steel to a level, where the corrosion rate is markedly reduced. Laboratory tests and results from field applications are reported.
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