Performance of FRP-Strengthened RC Beams with Different Concrete Surface Profiles
Publication: Journal of Composites for Construction
Volume 12, Issue 6
Abstract
Performance of fiber-reinforced polymer (FRP) composites in repair and retrofit of concrete structures depends to a great extent on the substrate condition to which it is bonded. The present research investigated the effect of concrete surface roughness on the bond behavior and general performance of FRP strengthening systems. The study included flexural testing of 26 specimens with two different carbon FRP systems (wet layup and precured) and three different levels of surface roughness. The influence of six different levels of anchorage by means of U-straps was also evaluated. Additionally, 10 bond specimens were tested in double shear for the wet layup FRP system to compare with the results of beam tests and to further investigate the debonding issue. Bond-dependent coefficient was analyzed with respect to different levels of surface roughness and shear span-to-depth ratio, and was then compared with other test results available in the literature. Surface roughness did not appear to have a significant influence on the overall performance of the FRP strengthening system with or without adequate anchorage, and whether failure was by debonding or rupture of FRP.
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Acknowledgments
This study was sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration, and was conducted as part of the National Cooperative Highway Research Program Project 10-59B, which is administered by the Transportation Research Board of the National Research Council, Senior Program Officers, Mr. David Beal and Dr. Amir Hanna. The experiments were carried out at the Structures and Construction Laboratory of the Florida International University. The input provided by the subconsultants, Dr. Mohsen Shahawy, Dr. Antonio Nanni, and Dr. Vistasp Karbhari is greatly acknowledged. The writers are also grateful to Sika Corp. and Hughes Brothers, Inc. for providing some of the materials used in this study. The findings and opinions expressed here, however, are those of the writers alone, and are not necessarily the views of the sponsoring agencies.
References
ACI. (1996). “Concrete repair guide.” ACI 546R-96, American Concrete Institute, Farmington Hills, Mich.
ACI. (2002). “Design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440.2R-02, American Concrete Institute, Farmington Hills, Mich.
Chajes, M. J., Finch, W. W., Januszka, T. F., and Thomson, T. A. (1996). “Bond and force transfer of composite material plates bonded to concrete.” ACI Struct. J., 93(2), 208–217.
Delaney, J., and Karbhari, V. (2007). “Defect criticality in FRP strengthening.” Proc., 8th Int. Symp. in Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures (FRPRCS-8) (CD-ROM), Univ. of Patras, Greece, Paper 3-20.
fib. (2001). “Externally bonded FRP reinforcement for RC structures.” Bulletin 14, Technical Report on the Design and Use of Externally Bonded Fiber Reinforced Polymer Reinforcement for Reinforced Concrete Structures, Int. Federation for Structural Concrete, Lausanne, Switzerland.
ICRI/ACI. (1999). Concrete repair manual, Joint publication by Int. Concrete Repair Institute and American Concrete Institute, Detroit, Mich.
Jeffries, J. M. (2004). “Bond behavior of fiber reinforced polymer laminates to concrete subjected to varied surface preparation.” MS thesis, Univ. of Missouri, Rolla, Mo.
Maerz, N. H., Chepur, P., Myers, J. J., and Linz, J. (2001). “Concrete roughness characterization using laser profilometry for fiber-reinforced polymer sheet application.” 80th Annual Meeting (CD-ROM), Transportation Research Board, Washington, D.C.
Mirmiran, A., Shahawy, M., Nanni, A., and Karbhari, V. (2004). “Bonded repair and retrofit of concrete structures using FRP composites—Recommended construction specifications and process control manual.” NCHRP Rep. No. 514, National Cooperative Highway Research Program (NCHRP), Transportation Research Board, Washington, D.C.
Mirmiran, A., Shahawy, M., Nanni, A., Karbhari, V., Yalim, B., and Kalayci, A. S. (2007). “Construction specifications for bonded repair and retrofit of concrete structures using FRP composites.” Final Rep., NCHRP Project 10-59B, Transportation Research Board, Washington, D.C.
Myers, J. J., Shen, X., and Maerz, N. H. (2007). “Effect of varied surface roughness, putty thickness and concrete strength on the interfacial bond strength of FRP to concrete.” 86th Annual Meeting (CD-ROM), Transportation Research Board, Washington, D.C.
Shen, X., Myers, J. J., Maerz, N., and Galecki, G. (2002). “Effect of surface roughness on the bond performance between FRP laminates and concrete.” Proc., 2nd Int. Conf. on Durability of Fiber Reinforced Polymer (FRP) Composites for Construction, B. Benmokrane and E. El-Salakawy, eds., Univ. of Sherbrooke, Canada, 607–616.
Ueda, T., and Dai, J. (2005). “Interface bond between FRP sheets and concrete substrates: Properties, numerical modeling and roles in member behavior.” Prog. Struct. Eng. Mater., 7(1), 27–43.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 12 • Issue 6 • December 2008
Pages: 626 - 634
Copyright
© 2008 American Society of Civil Engineers.
History
Received: Oct 23, 2007
Accepted: Jan 15, 2008
Published online: Dec 1, 2008
Published in print: Dec 2008
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