Flexural strengthening of reinforcement concrete beams using high performance fiber reinforcement cement-based composite (HPFRCC) and carbon fiber reinforced polymers (CFRP)

Ferrari, Vladimir José; Hanai, João Bento de; Souza, Rafael Alves de

doi:10.1016/j.conbuildmat.2013.07.026

Cited by 59 publications

(34 citation statements)

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“…Based on such already existing considerations, the present study complements the study of the proposal initially made by Ferrari et al (2013) and applied here to the strengthening through the Near Surface Mounted (NSM) technique, performed at the tensile zone and retrofitting the beams by the CCAD.…”

Section: Introductionmentioning

confidence: 70%

“…This measure was used based on the recommendations of Ferrari et al (2013), i.e., for allowing partial exposure of the reinforcement of the stirrups and, therefore, a greater connection between the concrete of the beam and the cement-based composite.…”

Section: Reinforced Concrete Beams Characteristicsmentioning

confidence: 99%

“…Figure 1. Beam previously recovered with CCAD and then strengthened with CFRP (Ferrari et al, 2013 In order to evaluate the tensile strength of the CCAD, the three point bending test of prismatic specimens with central notch, as recommended by the RILEM TC 162-TDF (Rilem, 2002), has been applied. In the Figure 2, it is observed the general configuration of the test that was conducted under control of the crack mouth opening displacements (CMOD -crack mouth opening displacement) using, for this purpose, an electrical extensometer of the clip gauge type.…”

Section: Composites Analyzedmentioning

confidence: 99%

“…In this regard, according to Ferrari, Hanai, and Souza (2013), the preliminary retrofitting of the tensile zone of reinforced concrete beams (as indicated in Figure 1) with a cement-based composite of high performance (CCAD), based on steel macro and microfibers, prevents the quick spread of critical crack at the edge of the strengthening and delays the early detachment of the blanket of CFRP. Such procedure is extremely interesting for the increase in stiffness of the part, in its load capacity and for a greater use of the resistant properties of the strengthenings.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years much research has been performed about bending and shear retrofitting of reinforced concrete beams with different materials such as steel plates, FRP and high performance fibre reinforced cement-based composite (Ferrari, Hanai, & Souza, 2013;Moatasem, Fayyadh, & Abdul, 2014;Hamdy, Afefy, & Hussein, 2015).…”

Section: Introductionmentioning

confidence: 99%

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<b>Carbon fiber reinforced polymer (CFRP) inserted in different configurations of the tensile zone retrofitting with microconcrete containing steel fibers to the strengthening of beams

2016

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ABSTRACT. It is researched, in this study, the strengthening technique known as Near Surface Mounted (NSM), which consists of the insertion of laminates of Carbon Fiber Reinforced Polymer (CFRP) into notches in the covering concrete structures. In the strengthening in beams, the tensile zone is found damaged for several reasons (cracking and corrosion, for instance), which demands, in the practice of engineering, its preliminary retrofitting. It should be considered that the good performance of the material used in this retrofitting is fundamental for a higher efficiency of the strengthening. Therefore, it is proposed a methodology that consists of the reconstitution of the tensile zone of the beams with a cementbased composite of high performance (CCAD), which acts as a substrate for the application of CFRP and as an element for the transfer of efforts to the part strengthened. The retrofitting of this tensile zone was performed only in the shear span, as well as throughout of the zone with a view to evaluating the influence of this aspect on the performance of the beams. The CCAD, produced from Portland cement, steel fibers and microfibers, was evaluated using the Rilem (2002), showed to be able to delay the cracking. Tests performed in the beams with the tensile zone retrofitting by CCAD and strengthening using the technique NSM showed the efficiency of the proposed methodology.Keywords: retrofitting, tensile zone, cement-based composite, strengthening, CFRP.Polímero reforçado com fibras de carbono (PRFC) inserido em diferentes configurações do banzo tracionado reconstituído por microconcreto com fibras de aço para o reforço de vigas RESUMO. Estuda-se nesta pesquisa a técnica de reforço conhecida como Near Surface Mounted (NSM), que consiste na inserção de laminados de Polímeros Reforçados com Fibras de Carbono (PRFC) em entalhes no concreto de cobrimento de estruturas. No reforço de vigas, o banzo tracionado encontra-se frequentemente danificado por razões diversas (fissuração e corrosão, por exemplo), o que exige na prática da engenharia sua prévia recuperação. Considerando-se que o bom desempenho do material dessa recuperação é fundamental para maior eficiência do reforço. Nesse sentido, propõe-se aqui uma metodologia que consiste na reconstituição da face tracionada de vigas com um compósito cimentício de alto desempenho (CCAD) que sirva como substrato para aplicação do PRFC e também como elemento de transferência de esforços à peça reforçada. A reconstituição desse substrato tracionado foi executada apenas no vão de cisalhamento, bem como ao longo da extensão do banzo com vistas a avaliar a influência desse aspecto no desempenho das vigas. Produzido à base de cimento Portland, fibras e microfibras de aço, o CCAD, avaliado usando-se conceitos da Rilem (2002), demonstrou ter condições de retardar a fissuração. Ensaios realizados em vigas com o banzo reconstituído pelo CCAD e reforço pela técnica NSM demonstraram a eficiência da metodologia proposta.Palavras-chave: reconstituição, banzo tracionado, compósit...

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Section: Introductionmentioning

confidence: 70%

Section: Reinforced Concrete Beams Characteristicsmentioning

confidence: 99%

Section: Composites Analyzedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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