Repair of Corrosion-Damaged Columns with FRP Wraps
Publication: Journal of Composites for Construction
Volume 5, Issue 1
Abstract
Corrosion of reinforcement in bridge piers is encouraged by chloride contamination from exposure to marine environment and from deicing salts used in bridges during winter. Because corrosion products generally occupy greater volume than the original material, expansive forces are generated in concrete leading to spalling of the cover and further acceleration of the reinforcement disintegration. Jacketing of such structures by fiber-reinforced composite sheets is an effective remedy, not only as a means of slowing down the rate of the reaction, but also by confining the concrete core thereby imparting to it ductility and strength. This paper presents results of an experimental parametric study of this method as a repair alternative for corroded structures. Several small-size concrete columns with various reinforcement configurations were subjected to accelerated corrosion conditions in the laboratory. After a target level of steel loss was attained the columns were repaired using a variety of repair alternatives. Most of the repair schemes considered included jacketing the damaged specimens with glass-fiber wraps, in combination with grouting the voids between the jacket and the original lateral surface of the specimen with either conventional or expansive grouts. To protect the glass fiber material from exposure to alkali activity of the fresh grout, and to reduce the supply of oxygen and water to the mechanism of corrosion, different types of diffusion barriers were considered in the study. The efficacy of each repair system was evaluated by (1) assessing the postrepair corrosion resistance of the specimens under repeated exposure to accelerated conditions; and (2) the mechanical strength and ductility enhancement under concentric compression loading.
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References
1.
Bonacci, J. F., et al. ( 1998). “Laboratory simulations of corrosion in reinforced concrete and repair with CFRP wraps.” Proc., CSCE 1998 Annu. Structural Specialty Conf., J. P. Newhook and L. G. Jaeger, eds., CSCE, Montreal, 653–662.
2.
Isley, F. ( 1992). “TYFO S epoxy and TYFO SEH-51 composite.” Res. and Devel. Lab. Rep., HEXCEL FYFE Associates, Dublin, Calif.
3.
Lee, C. ( 1998). “Accelerated corrosion and repair of reinforced concrete columns using CFRP sheets.” MASc thesis, Dept. of Civ. Engrg., University of Toronto.
4.
Manning, D. G. ( 1992). The design life of structures, “Design life of concrete highway structures—The North American scene.” Blackie and Son, Ltd., London, 144–153.
5.
Michniewicz, J. ( 1996). “Repair and rehabilitation of reinforced concrete columns with fibre-reinforced plastics.” MEng thesis, Dept. of Civ. Engrg., University of Toronto.
6.
Pantazopoulou, S. J., Bonacci, J. F., Hearn, N., Sheikh, S. A., and Thomas, M. D. A. ( 1996). “Repair of corrosion damaged concrete using advanced composite materials.” Proc., 2nd Int. on Advanced Compos. Mat. in Bridges and Struct. Conf., Canadian Society for Civil Engineering, Montreal, 457–463.
7.
Phillips, J. ( 1992). “The effect of corrosion on the structural performance of new and repaired one-way slabs.” PhD thesis, Dept. of Civ. Engrg., University of Toronto.
8.
Sheikh, S., Pantazopoulou, S., Bonacci, J., Thomas, M., and Hearn, N. ( 1997). “Repair of delaminated circular pier columns by ACM.” Ontario Joint Transp. Res. Rep. No. 31902, Ministry of Transportation of Ontario, Canada.
9.
Sheikh, S. A., Fu, Y., and O'Neill, M. W. ( 1994). “Expansive cement concrete for drilled shafts.” ACI Mat. J., 91(3), 237–245.
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Received: Mar 15, 1999
Published online: Feb 1, 2001
Published in print: Feb 2001
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