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Advances in Materials Science and Engineering
Volume 2017, Article ID 4387545, 7 pages
Research Article

Flexural Strengthening of RC Slabs Using a Hybrid FRP-UHPC System Including Shear Connector

1Department of Civil Engineering, Kangwon National University, Chuncheon-si, Gangwon-do 24341, Republic of Korea
2Department of Civil Engineering, University of New Mexico, MSC01 1070, Albuquerque, NM 87131-0001, USA
3Department of Civil Engineering, Kyungnam University, 7 Kyungnamdaehak-ro, Changwon-si 51767, Republic of Korea

Correspondence should be addressed to Jung J. Kim;

Received 11 April 2017; Accepted 7 May 2017; Published 5 June 2017

Academic Editor: Doo-Yeol Yoo

Copyright © 2017 Jiho Moon et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A polymeric hybrid composite system made of UHPC and CFRP was proposed as a retrofit system to enhance flexural strength and ductility of RC slabs. While the effectiveness of the proposed system was confirmed previously through testing three full-scale one-way slabs having two continuous spans, the slabs retrofitted with the hybrid system failed in shear. This sudden shear failure would stem from the excessive enhancement of the flexural strength over the shear strength. In this study, shear connectors were installed between the hybrid system and a RC slab. Using simple beam, only positive moment section was examined. Two full-scale RC slabs were cast and tested to failure: the first as a control and the second using this new strengthening technique. The proposed strengthening system increased the ultimate load carrying capacity of the slab by 70%, the stiffness by 60%, and toughness by 128%. The efficiency of shear connectors on ductile behavior of the retrofitted slab was also confirmed. After the UHPC top is separated from the slab, the shear connector transfer shear load and the slab system were in force equilibrium by compression in UHPC and tension in CFRP.