Flexural repair/strengthening of pre-damaged R.C. beams using embedded CFRP rods

Morsy, Alaa M.; El-Tony, El-Tony M.; El-Naggar, M.

doi:10.1016/j.aej.2015.07.012

Cited by 19 publications

(6 citation statements)

References 3 publications

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“…Under service loading, reinforced concrete structural members of existed structures are frequently subjected to macro-flexural cracking, which reduces their loading capacity. There is ample evidence in the literature [35][36][37] on the feasibility of using advanced composite materials to strengthen the loading capacity of uncracked concrete members. Over the last two decades, various researchers have investigated the use of SHCC as materials for the strengthening of RC beams.…”

Section: Methodsmentioning

confidence: 99%

Susceptibility of strain-hardening cementitious composite to curing conditions as a retrofitting material for RC beams

Khan

Fares

Abbas

et al. 2021

Journal of Engineered Fibers and Fabrics

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Strain-hardening cement-based composites (SHCC) have recently been developed as repair materials for the improvement of crack control and strength of flexural members. This work focuses on strengthening and flexural enhancement using SHCC layer in tensile regions of flexural members under three different curing conditions. The curing conditions simulate the effect of different environmental conditions prevailing in the central and coastal regions of the Arabian Peninsula on the properties of SHCC as a retrofitting material. In this investigation, beams with SHCC layer were compared to control beams. The beams with SHCC layer of 50-mm thickness were cast. The results revealed that the flexural behavior and the load-carrying capacity of the normal concrete beam specimens under hot and dry environmental conditions were significantly reduced, lowering the ductility of the section. However, compressive strength is comparatively unaffected. Similarly, the hot curing conditions have also led to a notable reduction in the loading capacity of the beam with SHCC layer with a slight effect on its stiffness. On the other hand, steam-curing conditions have shown improvement in load-carrying capacity and a reduction in section ductility of the beam with SHCC layer. It was found that the structural unit retrofitted with SHCC layer was a curing-regime dependent as the tensile and strain-hardening properties of SHCC are highly sensitive to the alteration in the cement hydration process. A normal curing regime was found effective and satisfying the practical, cost, and performance requirements. Accordingly, a normal curing regime could be implemented to retrofit reinforced concrete (RC) beams with SHCC layers as recommended in the study.

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Section: Methodsmentioning

confidence: 99%

Susceptibility of strain-hardening cementitious composite to curing conditions as a retrofitting material for RC beams

Khan

Fares

Abbas

et al. 2021

Journal of Engineered Fibers and Fabrics

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“…Over the last few years, interest in the rehabilitation and repair of reinforced concrete (RC) structures using innovative materials has increased as the premature degradation of RC structures exposed to severe environmental conditions has become an increasingly serious problem. Currently, the most recent technologies used to repair and strengthen RC elements can be summarised as, carbon-fibre-reinforced polymer (CFRP) bars [1][2][3], steel members [4,5], textile-reinforced concrete or mortar [6,7], ferrocement materials [8,9], fabricreinforced cementitious matrix (FRCM) [10,11], ultra-high strength fibre-reinforced concrete (UHPFRC) [12][13][14], polyvinyl alcohol fibre reinforced geopolymer concrete (PVAFRGC) [15] and hooked-end steel fibre concretes [16]. All of the above jacketing techniques have proven to be viable alternatives to conventional RC jacketing.…”

Section: Introductionmentioning

confidence: 99%

Innovative Flexural Repair Technique of Pre-Damaged T-Beams Using Eco-Friendly Steel-Fibre-Reinforced Geopolymer Concrete

Khalifa,

El-Thakeb,

El-Sebai

et al. 2023

Fibers

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This paper presents an innovative flexural repair technique for pre-damaged reinforced concrete T-beams using eco-friendly steel-fibre-reinforced geopolymer concrete (SFRGPC). The study considers various parameters such as repair layer depth, location and configuration, and the use of additional reinforcement in one beam. The beams were preloaded to 50% of their ultimate flexural capacity. Extensive measurements were taken, including crack initiation and propagation, crack width, initial stiffness, load deflection, peak loads, ductility index, and strain values. The structural performance of the repaired T-beams under flexural loading was predicted using an analytical model. The repaired beams showed an increase in carrying capacity, stiffness, and ductility, but the failure mode was identical to the control samples. The study shows that SFRGPC shows great promise as a technique for not only repairing pre-damaged reinforced concrete beams but also for their strengthening. The best results were obtained with three-sided jackets with fibrous geopolymer concrete only, resulting in a load-carrying capacity increase of 25.8% compared to reference T-beams. The bonding between SFRGPC and existing concrete was effective, with no slippage or disintegration at the interface. The repaired beams’ structural behaviour and performance under flexural loads were successfully predicted using the analytical model, with a precision of about 98%.

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“…CFRP plate debonding and bending zone flexural crack propagation destroyed all RC-strengthened beams, while exterior-bonded CFRP had 70-80% more moment capacity than unstrengthened beams. In [14][15][16], the behavior of beams after CFRP reinforcement was investigated. In [17], the length of the CFRP strip was examined on CFRPreinforced slabs after experimental preloading.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Stiffness and Ductility of Pre-Cracked RC Beams after repairing with CFRP using Different Strengthening Methods

Yahya Turki,

Al-Farttoosi

2023

Eng. Technol. Appl. Sci. Res.

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This study investigated the stiffness and ductility of rectangular Reinforced Concrete (RC) beams. The beams were obtained through an experimental program that included one reference and eight RC beams, divided into two separate groups strengthened with Externally Bonded Reinforcement (EBR) and Near-Surface Mounted (NSM) reinforcement in flexural using Carbon Fiber Reinforced Polymer (CFRP) laminate after they were pre-cracked or damaged at different levels. The comparison results of the reference and the strengthened beams showed that the latter had a higher degree of stiffness. The stiffness in the yielding stage increased by 6.43% to 19.81% for the EBR-strengthened group and by 31.08% to 105.8% for the NSM-strengthened group. At the 140 kN loading stage, the stiffness increased by 33 to 101.5% for the EBR-strengthened group and by 136.5% to 332.25% for the NSM-strengthened group. At the ultimate load stage, the stiffness increased by 12.72% to 46.13% for the EBR-strengthened group and by 56.85% to 122.94% for the NSM-strengthened group. On the other hand, the comparison revealed that the ductility of the reference beam was much better than that of the reinforced beams.

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Flexural repair/strengthening of pre-damaged R.C. beams using embedded CFRP rods

Cited by 19 publications

References 3 publications

Susceptibility of strain-hardening cementitious composite to curing conditions as a retrofitting material for RC beams

Susceptibility of strain-hardening cementitious composite to curing conditions as a retrofitting material for RC beams

Innovative Flexural Repair Technique of Pre-Damaged T-Beams Using Eco-Friendly Steel-Fibre-Reinforced Geopolymer Concrete

Investigation of the Stiffness and Ductility of Pre-Cracked RC Beams after repairing with CFRP using Different Strengthening Methods

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