Corrosion of reinforcing bars in cracked
concrete specimens
Half-cast corrosion specimen
To date more than 400 concrete prisms were cast. Half of them have a
preformed crack of 0.3 - 0.4 mm and all of them contain U-shaped reinforcing
bar. Variables include:
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w/c=0.6
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w/c=0.25
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plain bars uncoated
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epoxy-coated rebars (5 different types)
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galvanized steel bars
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three types of corrosion inhibitors
Recently we started a new testing program that involves testing of concrete
slab specimens with preformed cracks of 0.1, 0.2 0.3 and 0.4 mm widths
and W/C 0.6, 0.5, 0.4, 0.3, and 0.25 with silica fume cement replacement.
Each specimen contains two straight uncoated bars and SS counter electrode.
Specimens are placed at Treat Island and in the accelerated testing chamber
at UNB.
Testing is carried out by Irina Kondratova, PhD
graduate student, at the natural marine exposure station (Treat's Island,
Maine) and in the Marine Environment Simulation Setup (MESS) at the University
of New Brunswick.
Publications
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Bremner, T.W., Kondratova, I. and Erdogdu, S., (1995), Corrosion of Plain
and Epoxy- Coated Rebars in Concrete Slabs, in the proceedings of the R.N.
Swamy Symposium on Real World Concrete which is part of the Fifth CANMET/ACI
International Conference on Fly Ash, Silica Fume, Slag and Natural Pozzolans
in Concrete, Editor Gurdev Singh, Milwaukee, WI, June 5, pp. 17-34.
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Kondratova, I. L., Bremner, Theodore W., and Erdogdu, S, (1996), Effect
of Type of Sureface Treatment and Epoxy Coating on Corrosion Activity,
Proceedings of Third CANMET/ACI International Conference on Performance
of Concrete in marine Environment, St. Andrews by-the Sea, Canada 1996,
American Concrete Institute SP-163, Editor V.M. Malhotra, pp. 447-463.
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V. F. Stepanova, N. K. Rozental and I. L. Kondratova (1996) Russian experience
with concrete structures in sea water at the Kislaya Guba tidal power station,
supplementary papers volume, Third International Conference on the
Performance of Concrete in Marine Environment, St. Andrews -by-the-Sea,
New Brunswick, held August 4-9, 1996.
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Kondratova, I.L. and Bremner, T.W., (1997), “Performance of Epoxy-Coated
Steel in Concrete Slabs Subjected to Aggressive Environment”, in the Proceedings
of International Conference on Engineering Materials, June 8-11, 1997,
Ottawa, Canada, pp.15-29.
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Kondratova, I. L., Bremner, T. W. and Erdogdu, S. (1997), " Performance
of Epoxy Coated Reinforcing Bars Cast in Concrete Slabs and Exposed to
Sea Water ", L'Industria Italiana del Cemento, N. 723 -July-August 1997,
pp. 568-577.
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Kondratova, I.L., Bremner, T. W., (1996), “Performance Of Epoxy-Coated
Steel In Concrete Slabs Subjected To Aggressive Environment”, invited paper
for the Concrete Canada Meeting, August 11-13, 1996, Universit? de Moncton,
Moncton, New Brunswick, student presentations session. Presented on August
11, 1996. Published in non-refereed Concrete Canada's General Meeting 1996.
Student Seminar publication, pp. 23-32.
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Kondratova, I.L., Bremner, T. W., (1997), “The Effectiveness of Epoxy Coatings
and Corrosion Inhibitors in Concrete Containing Embedded Steel - An Experimental
Study”, paper presented at the Conference on Understanding Corrosion Mechanisms
of Metals in Concrete. A Key to Improving Infrastructure Durability, July
27-31, 1997, Cambridge, Massachusetts, USA. Extended abstract published
in the proceedings of the Conference.
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Kondratova, I.L. and Bremner, T.W., (1997), “Performance of Epoxy-Coated
Steel and Corrosion Inhibitors in Concrete Slabs Subjected to Aggressive
Environment”, Supplementary Proceedings of the Fourth CANMET/ACI International
Conference on Durability of Concrete in Sydney, Australia, pp.657-673.
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Paper on "Field and
Laboratory Performance of Epoxy-Coated Reinforcement in Cracked and Uncracked
Concrete", Presented at the TRB Annual Meeting in Washington, DC, Jan.
11-15, 1998 (in PDF format)
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