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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: Electric Prestressing of Reinforcing Steel
Author(s): Karl P. Billner and Roy W. Carlson
Publication: Journal Proceedings
Appears on pages(s): 585-592
Abstract:In the electric method of prestressing, smooth re- inforcing rods are stressed by being temporarily expanded by an electric current after the concrete has hardened. The rods are coated with a thermo- plastic material such as sulfur which melts and re- lieves the bond only while the rods are temporarily heated by the electric current. While the rods are expanded, nuts are taken up at the ends a predeter- mined amount to provide the desired prestress. Two notable features of the method are (I) that bond is restored with cooling and resolidification of the sulfur coating and (2) that the quick heating of the rods does not warm the concrete appreciably. Interesting results of tests and trials are reported.
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