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<doi>/ISEC.res.2018.22</doi>
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<article-title>EFFECTIVENESS OF FRCM SYSTEM IN<br/>STRENGTHENING RC BEAMS IN SHEAR USING<br/>HYBRID NSE/EB TECHNIQUE
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<author>USAMA EBEAD and TADESSE WAKJIRA</author>

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Dept of Civil and Architectural Engineering, College of Engineering, Qatar University, Doha, Qatar
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<title>ABSTRACT</title>
<p>This paper presents an experimental study on the efficacy of a recently introduced
hybrid “near surface embedded/ externally bonded” NSE/EB fabric reinforced
cementitious matrix (FRCM). Seven medium scale RC beams, deficient in shear, were
constructed and tested under three-point loading. Six beams were strengthened using
hybrid NSE/EB-FRCM technique and one beam was left un-strengthened as a
reference. Two main test variables were considered; viz., strengthening configuration:
full versus intermittent strengthening configuration and FRCM type: glass FRCM
versus polyparaphenylene benzobisoxazole (PBO). The test results revealed that the
hybrid NSE/EB-FRCM strengthening technique is effective in enhancing the shear
capacity of the strengthened beams. The strengthened specimens showed an average of
67% higher shear capacity relative to the reference specimen. With regard to the
FRCM type, G-FRCM strengthened specimens showed an average of 73%
enhancement in the shear capacity, which was 12% higher than the value for PBO-FRCM
counterpart. Moreover, the strengthened beams showed higher deflection at the
ultimate load than that of the reference specimen. Furthermore, the hybrid NSE/EB-FRCM
technique has shown to be a promising alternative to the conventionally used
externally bonded FRCM system with the potential to reduce the debonding of FRCM
from the concrete substrate.</p>
<p><italic>Keywords: </italic>Rehabilitation, Near surface embedded/externally bonded, Fabric reinforced cementitious matrix (FRCM), Reinforce concrete (RC) beam.</p>
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