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Open AccessArticle

Strengthening of Fibre Reinforced Concrete Elements: Synergy of the Fibres and External Sheet

Vilnius Gediminas Technical University (VGTU), Sauletekio Av. 11, 10223 Vilnius, Lithuania
Department of Civil Engineering, The University of Hong Kong, Pokfulam 999077, Hong Kong, China
Authors to whom correspondence should be addressed.
Sustainability 2019, 11(16), 4456;
Received: 10 July 2019 / Revised: 13 August 2019 / Accepted: 15 August 2019 / Published: 17 August 2019
In structural rehabilitation and strengthening, the structural members are often required to cope with larger design loading due to the upgrading of building services and design standard, while maintaining the member size to preserve the architectural dimensions and headroom. Moreover, durability enhancement by mitigating or eliminating the reinforcement corrosion problem is often desired. Concrete cracking is a major initiating and accelerating factor of the corrosion of steel reinforcement. The application of fibres is a prominent solution to the cracking problem. Furthermore, the fibres can increase the mechanical resistance of the strengthening systems. This study reveals the synergy effect of the combined application of steel fibres and external carbon fibre-reinforced polymer (CFRP) sheets. The investigation encompasses the use of fibre-reinforced polymer (FRP) reinforcing bars, discrete steel fibres, externally bonded and mechanically fastened FRP sheets in different combinations. It is discovered that the steel fibres can help to control concrete cracking and eventually alter the failure mode and enhance the flexural resistance. The FRP reinforcement system, together with the steel fibres, radically resolves the structural safety problem caused by corrosion of the steel bar reinforcement. Finally, the impact of the external sheet on the fire limit state performance needs to be resolved, such as by adopting fire protection rendering for the finishes layer. View Full-Text
Keywords: external sheet; fibre-reinforced polymer; mechanical fastening; steel fibre external sheet; fibre-reinforced polymer; mechanical fastening; steel fibre
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Gribniak, V.; Ng, P.-L.; Tamulenas, V.; Misiūnaitė, I.; Norkus, A.; Šapalas, A. Strengthening of Fibre Reinforced Concrete Elements: Synergy of the Fibres and External Sheet. Sustainability 2019, 11, 4456.

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