MICROSTRUCTURAL DESIGN OF CONCRETE REINFORCING BARS FOR IMPROVED CORROSION PERFORMANCE

The corrosion performance of reinforcing steel embedded in concrete is dependent on many variables. These variables include differences in materials constituents, microstructure, processing procedures, concrete mixture proportions, structural design, construction methods, loadings, cracks, and environmental conditions. Many reinforced concrete (RC) structures are expected to have relatively long service lives under severe loading and exposure conditions. Often, the primary governing factor affecting the service life of the structure is the corrosion performance of the steel reinforcement. For many systems, concrete is the only protective cover that prevents the ingress of aggressive ions and eventual corrosion of the reinforcing steel. Significant advances in state-of-the-practice have been exhibited with the use of high-performance concrete materials. However, other approaches need to be investigated to ensure long-term serviceability of these structures. A complementary approach to improving the quality and corrosion performance of RC structures is to utilize reinforcement that has been microstructurally designed to resist corrosion. To properly evaluate the corrosion performance and to better predict the service life of RC structures, it is necessary to evaluate the characteristics of the bulk concrete, the steel-concrete interface, the steel mill scale, the passive film, and the steel microstructure. This research investigated the performance of microstructurally designed reinforcing steel for improved corrosion resistance when embedded in concrete and exposed to accelerated chloride environments. RC specimens containing American Society for Testing and Materials (ASTM) A 615 and controlled rolled dual-phase ferritic martensitic (DFM) reinforcing steels were embedded in concrete and subjected to chloride solutions. Samples were then evaluated for mass loss and macrocell current flow for a period of approximately one year. The results from the macrocell and mass loss testing indicate that the controlled rolled DFM reinforcing steel exhibited less mass loss from corrosion than the ASTM A 615 reinforcing steel.

• Record URL:
  http://www.concrete.org/Publications/InternationalConcreteAbstractsPortal.aspx.aspx?m=details&i=809
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/13846872
• Supplemental Notes:
  • This work was supported in part by U.S. Navy Contract NA47408-95-C-0225, NCHRP Contract No. 28, a National Science Foundation Research Grant, and by the Director, Office of Basic Energy Sciences, Division of Materials Sciences of the U.S. Department of Energy under Contract No. DE-AC-03-76SF00098.
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Trejo, David
  • Monteiro, P
  • Gerwick Jr, B C
  • Thomas, G
• Publication Date: 2000-1

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 78-83
• Serial:
  • ACI Materials Journal
  • Volume: 97
  • Issue Number: 1
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-325X
  • Serial URL: https://www.concrete.org/publications/acimaterialsjournal.aspx

Subject/Index Terms

• TRT Terms: Accelerated tests; Chlorides; Corrosion; Corrosion resistance; Corrosion resistant steel; Corrosion tests; Durability; High performance concrete; Mass; Mechanical tests; Microstructure; Mix design; Reinforced concrete; Reinforcing bars; Reinforcing steel; Service life
• Identifier Terms: ASTM International
• Subject Areas: Design; Geotechnology; Highways; Materials; I32: Concrete; I34: Steels and Metals;

Filing Info

• Accession Number: 00792326
• Record Type: Publication
• Contract Numbers: CMS-9413725
• Files: TRIS
• Created Date: May 11 2001 12:00AM