Cracking Behavior of CFRP Laminate-Strengthened RC Beams with Premechanical and Postmechanical Environmental Damage
Publication: Journal of Composites for Construction
Volume 19, Issue 4
Abstract
The main objectives of this study are to investigate the effects of three types of predamage and postdamage on the cracking behaviors of carbon fiber-reinforced polymer (CFRP)-strengthened reinforced concrete RC beams and to develop a rational methodology for predicting the average stabilized crack spacing. The predamage is induced by either sustained loading only or by the combination of sustained loading and corrosion. The predamage involved a sustained loading with an anchor tightening system, an electrochemical process to accelerate the migration of chlorides from an external electrolyte into the tested beams, and a wetting–drying cycle process with a controlled current to accelerate the corrosion of the reinforcing steel bars in the tested beams. The postdamage was induced by wetting–drying cycles. A loading test was conducted to determine the cracking behaviors of stabilized flexural cracks in the CFRP-strengthened beams with or without damage. The crack patterns, crack spacings, and test beam widths were recorded and compared, and the related mechanism was discussed. It was found that after CFRP strengthening, the effect of predamage or postdamage on the crack spacing and width is not as distinct as in the unstrengthened cases. The sustained loading predamaged beam showed insignificant differences in crack spacing and width compared to beams without predamage. Subsequently, a model capable of evaluating the crack behaviors of CFRP-strengthened beams with or without damage was developed. The analytical approach is based on equilibrium and compatibility equations to elucidate the average stresses of concrete and the CFRP laminate of a CFRP-strengthened beam element.
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Acknowledgments
The financial support from the Zhejiang Provincial Natural Science Foundation of China (Grant No. LR12E08001) and the Natural Science Foundation of China (Grant No. 81308494) is greatly appreciated.
References
ASTM. (2002). “Practice for preparing, cleaning, and evaluating corrosion test specimens.” G1-90, West Conshohocken, PA.
Badawi, M., and Soudki, K. (2010). “CFRP repair of RC beams with shear-span and full-span corrosions.” J. Compos. Constr., 323–335.
Bonacci, J. F., and Maalej, M. (2000). “Externally bonded fibrereinforced polymer for rehabilitation of corrosion damaged concrete beams.” ACI Struct. J., 97(5), 703–711.
Canadian Standard Associations (CSA). (2004). “Concrete structures.” S474, Mississauga, ON, Canada.
Ceroni, F., and Pecce, M. (2009). “Design provisions for crack spacing and width in RC elements externally bonded with FRP.” Composites Part B, 40(1), 17–28.
Debaiky, A. S., Green, M. F., and Hope, B. B. (2002). “Carbon fiber reinforced polymer wraps for corrosion control and rehabilitation of reinforced concrete columns.” ACI Mater. J., 99(2), 129–137.
El Maaddawy, T., and Soudki, K. (2003). “Effectiveness of impressed current technique to simulate corrosion of steel reinforcement in concrete.” J. Mater. Civ. Eng., 41–47.
El Maaddawy, T., and Soudki, K. (2005). “Carbon-fiber-reinforced polymer repair to extend service life of corroded reinforced concrete beams.” J. Compos. Constr., 187–194.
Fib model code for concrete structures 2010. (2013). International federation for structural concrete (fib), Wilhelm Ernst & Sohn, Berlin, Germany.
Holloway, L. C., and Leeming, M. B. (1999). Strengthening of reinforced concrete structures: Using externally-bonded FRP composites in structural and civil engineering, Woodhead Publishing, Abington, Cambridge, U.K.
Jiang, D., Shah, S. P., and Andonian, A. (1984). “Study of the transfer of tensile forces by bond.” ACI Struct. J., 81(3), 251–259.
Kankam, C. (1997). “Relationship of bond stress, steel stress, and slip in reinforced concrete.” J. Struct. Eng., 79–85.
Lau, D., and Büyüköztürk, O. (2010). “Fracture characterization of concrete/epoxy interface affected by moisture.” Mech. Mater., 42(12), 1031–1042.
Luping, T., and Nilsson, L. O. (1993). “Rapid determination of the chloride diffusivity in concrete by applying an electric field.” ACI Mater. J., 89(1), 49–53.
Masoud, S., and Soudki, K. (2006). “Evaluation of corrosion activity in FRP repaired RC beams.” Cem. Concr. Compos., 28(10), 969–977.
Masoud, S., Soudki, K., and Topper, T. (2001). “CFRP-strengthened and corroded RC beams under monotonic and fatigue loads.” J. Compos. Constr., 228–236.
Nossoni, G., and Harichandran, R. (2010). “Improved repair of concrete structures using polymer concrete patch and FRP overlay.” J. Mater. Civ. Eng., 314–322.
Oehlers, D. J. (2001). “Development of design rules for retrofitting by adhesivebonding or bolting either FRP or steel plates to RC beams or slabs inbridges and buildings.” Compos. Part A, 32(9), 1345–1355.
Raoof, M., and Hassanen, M. A. H. (2000). “Peeling failure of reinforced concrete beams with fibre-reinforced plastic or steel plates glued to their soffits.” Proc. Inst. Civ. Eng. Struct. Build., 140(3), 291–305.
Saadatmanesh, H., Tavakkolizadeh, M., and Mostofinejad, D. (2010). “Environmental effects on mechanical properties of wet lay-up fiber-reinforced polymer.” ACI Mater. J., 107(3), 267.
Sciolti, M., Frigione, M., and Aiello, M. (2010). “Wet lay-up manufactured FRPs for concrete and masonry repair: Influence of water on the properties of composites and on their epoxy components.” J. Compos. Constr., 823–833.
Tuakta, C., and Büyüköztürk, O. (2011). “Deterioration of FRP/concrete bond system under variable moisture conditions quantified by fracture mechanics.” Composites Part B, 42(2), 145–154.
Wang, C. Y., and Ling, F. S. (1998). “Prediction model for the debonding failure of cracked RC beams with externally bonded FRP sheets.” Proc., 2nd Int. Conf. of Composites in Infrastructure (ICCI), AZ, 548–562.
Wang, C. Y., Shih, C. C., Hong, S. C., and Hwang, W. C. (2004). “Rehabilitation of cracked and corroded reinforced concrete beams with fiber-reinforced plastic patches.” J. Compos. Constr., 219–228.
Wootton, I. A., Spainhour, L. K., and Yazdani, P. E. (2003). “Corrosion of steel reinforcement in carbon fiber-reinforced polymer wrapped concrete cylinders.” J. Compos. Constr., 339–347.
Zhang, D. W., Ueda, T., and Furuuchi, H. (2011). “Average crack spacing of overlay-strengthened RC beams.” J. Mater. Civ. Eng., 1460–1472.
Zhang, D. W., Ueda, T., and Furuuchi, H. (2012). “A design proposal for concrete cover separation in beams strengthened by various externally bonded tension reinforcements.” J. Adv. Concr. Technol., 10(9), 285–300.
Zhao, Y. X., Lin, H. W., Wu, K., and Jin, W. L. (2013). “Bond behavior of normal/recycled concrete and corroded steel bars.” Constr. Build. Mater., 48, 348–359.
Information & Authors
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Published In
Journal of Composites for Construction
Volume 19 • Issue 4 • August 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 23, 2014
Accepted: Jul 23, 2014
Published online: Sep 23, 2014
Discussion open until: Feb 23, 2015
Published in print: Aug 1, 2015
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