In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
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.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
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: Effect of Rust and Scale on the Bond
Characteristcs of Deformed Reinforcing Bars
Author(s): E. L. Kemp, F. S. Brezny, and J. A. Unterspan
Publication: Journal Proceedings
Appears on pages(s): 743-756
Keywords: bond (concrete to reinforcement);deformed reinforcement;reinforced concrete; reinforcing steel;research;rusting;scale (corrosion).
Abstract:An experimental program was established to provide needed information on bond characteristics of ASTM A 432 bars with a broad range of scale and rust conditions. The principle parameter in the test series was the bar surface conditions. It was concluded that the bond characteristics of deformed reinforcing bars with deformations meeting ASTM A 305 specifications do not appear to be adversely affected by varying degrees or types of surface rust or ordinary mill scale provided the weight of the bar meets the minimum ASTM weight and deformation height requirements. The deformation dimensions appear to govern bond characteristics of rusty bars, in that these bars exhibit a behavior similar to companion "as rolled" bars. The test data indicate that the current bond requirements are quite conservative, especially with regard to smaller bars because of the 800 psi (nom. 60 kgf/cm’) maximum stress limit. Concrete strength appears to control the over-all bond behavior, particularly slip and deformation, to a much greater extent than the surface condition of the bar.
Click here to become an online Journal subscriber