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: Long-Term Corrosion Resistance of Steel in Silica Fume and/or Fly Ash Containing Concretes
Author(s): N. S. Berke, M. J. Scali, J. C. Regan, and D. F. Shen
Publication: Special Publication
Appears on pages(s): 393-422
Keywords: carbonation; chlorides; corrosion; electron microscopes; fly ash; hydration; microstructure; permeability; resistivity; silica fume; x-ray analysis; Materials Research
Abstract:Silica fume and/or fly ash concretes were produced to determine the long-term effects of these pozzolans on chloride ingress, electrical resistivity, microstructure, and the subsequent effect on corrosion of embedded steel reinforcement. Initial results of these experiments showed that there was a good relationship between the 28-day compressive strength, rapid chloride permeability, and electrical resistivity. In this paper the long-term corrosion performance, electrical resistivity, chloride ingress, and microstructure are examined after 3 years of partial ponding in 3 percent NaCL. These results are compared to the initial concrete properties to determine how well early measurements of the properties relate to long-term corrosion resistance and chloride ingress. Also, long-term changes in the concrete microstructures are documented. The results show that concrete resistivity and rapid chloride permeability measurements are better indicators of corrosion resistance than concrete strength. In general, increasing silica fume and/or fly ash contents and/or reducing water-cementitious ratios improves corrosion resistance. However, for mixes with over 20 percent pozzolans by mass of cement, some carbonation has occurred next to cracks where the reinforcement exited (the nonsubmerged sections of the samples). The significance of these findings is discussed.
Click here to become an online Journal subscriber