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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: Concrete Cover Cracking with Localized Corrosion of Reinforcing Steel
Author(s): A. A. Torres-Acosta, and A. A. Sagues
Publication: Special Publication
Appears on pages(s): 591-612
Keywords: corrosion; cracking; energy; fracture properties; strain
Abstract:This work estimated experimentally the critical amount of steel corrosion (Xcrit) needed for concrete cover cracking of a reinforced concrete element where only a fraction of the steel bar length is corroding. The amount of corrosion needed to crack the concrete cover (Xcrit) was ~49 um to ~137 um in specimens with localized corrosion, in comparison to ~15 um to 75 um for uniform corrosion reported for other investigations in comparable systems. An empirical equation is proposed for Xcrit as a function of specimen dimensions (concrete clear cover, C; rebar diameter, ; and anodic length, L). In this equation Xcrit is proportional to the first power of C/ and to the higher power of [C/L+1]. Quantitative determinations of the development and magnitude of stresses produced by corroding steel in concrete have been obtained. Estimated pressures at the steel/concrete interface for C/ > 3 reached values comparable to the concrete compressive strength. The potential use of a fracture-energy-based model to predict Xcrit was supported by indications of approximate agreement between estimates of the work of corrosion expansion and the energy required to crack the concrete.
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