Shear strengthening of RC beams using NSM CFRP bonded using cement-based adhesive

Alwash, Dia; Kalfat, Robin; Al-Mahaidi, Riadh; Du, Hongjian

doi:10.1016/j.conbuildmat.2021.124365

Cited by 50 publications

(24 citation statements)

References 20 publications

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“…With regard to FRPs, glass fiber-reinforced polymers, such as aramid FRPs (AFRPs) and carbon FRPs (CFRPs) have been used as major strengthening materials [ 18 ]. FRPs exhibit brittle failure but have superior strength, weight, durability, creep, and fatigue resistance, compared to existing construction materials [ 19 , 20 , 21 , 22 ]. In addition, their easy handling in the field owing to their low weight, the possibility of rapid installation with a small number of people, and their high-corrosion resistance have expanded the applicability of FRPs [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Effects of Additional Prestressing Using Fiber Reinforced Polymers and Strands on Deterioration of PSC Bridge Structure

et al. 2022

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Concrete bridge structures require reinforcement, as their performance deteriorates over time. In this regard, this study evaluated the effect of additional prestressing using fiber-reinforced polymers (FRPs) and strands applied to a demolished, deteriorated bridge. In particular, specimens were prepared for a bridge subjected to non-, near-surface mounted (NSM), and external prestressing (EP) strengthening to evaluate the stiffness and safety of the structure. In the 200–400 kN load range, the EP method exhibited the highest stiffness (15 kN/mm), followed by non-strengthening (8.5 kN/mm) and the NSM method (5.45 kN/mm). The EP method increased the stiffness by approximately two times; however, the NSM method decreased the stiffness by 0.6 times. In the 400–800 kN load range, the EP and NSM methods yielded stiffness values of 2.58 and 0.7 kN/mm, respectively. These results confirm that the EP method reinforces the structure. The results of this study are expected to be used as basic data to reinforce deteriorated bridges in actual operation.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Effects of Additional Prestressing Using Fiber Reinforced Polymers and Strands on Deterioration of PSC Bridge Structure

et al. 2022

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“…The size and strengthened form of CFRP in shear-strengthened beams and bending-strengthened beams are determined according to existing research (Alwash et al. , 2021; Peng et al.…”

Section: Test Methodsmentioning

confidence: 99%

“…The carbon fibers became loose and the geopolymer was completely immersed (see Figure 3). (Alwash et al, 2021;Peng et al, 2022;Song and Yu, 2015;Yang et al, 2021;Yu et al, 2019Yu et al, , 2021, and CFRP width is 50 mm, details of strengthened form are shown in Figure 4(a)-(b). The U-shaped and complete-wrapped shear-reinforcement was adopted.…”

Section: Cfrp-strengthened Schemementioning

confidence: 99%

Experimental study on performance of CFRP-strengthened RC beams with geopolymer and epoxy

Liu

Wen

et al. 2022

IJSI

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PurposeIn this paper, to obtain shear and bending performance of carbon fiber-reinforced polymer (CFRP)-strengthened beams bonded by geopolymers, the effects of impregnated adhesive types, strengthened scheme, CFRP layer and pre-cracked width are investigated, and the performance of CFRP-strengthened beams is validated by the establishment of Finite Element Models (FEMs).Design/methodology/approachIn this paper, static loading test and finite element analysis of epoxy-CFRP-strengthened (ECS) and geopolymer-CFRP-strengthened (GCS) were carried out, and the bearing capacity and stiffness were compared, the results show that GCS reinforced concrete (RC) beam is feasible and effective.FindingsThe bearing capacity, crack distribution and development, load–deflection curves of GCS RC beams with different pre-crack widths were investigated. The reinforcement effect of geopolymer achieves the same as epoxy, effectively improving the ultimate bearing capacity of the beam, with a maximum increase rate of 28.9%. The failure mode of CFRP is broken in the yield failure stage of GCS RC beam with reasonable strengthening form, and the utilization rate of CFRP is improved. CFRP-strengthened layers, pre-cracked widths significantly affect the mechanical properties, and deformation properties of the strengthened beams.Originality/valueCompared with ECS RC beams, the bearing capacity and stiffness of GCS RC beams are similar to or even better, indicating that GCS RC beam is feasible and effective. It is a new method for CFRP-strengthened beams, which not only conforms to the concept of national ecological civilization construction, but also provides an economical, environmentally friendly and excellent performance solution for structural reinforcement.

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“…Feasibility of using NSM technique for rehabilitation of masonry and concrete structures was investigated in several published studies. [17][18][19][20][21][22][23][24] The effect of adhesive type on the bond of NSM tape to concrete was investigated by Shield et al 25 Douadi et al 26 discussed bond behavior between near-surface mounted (NSM) composite reinforcement and low-strength concrete. A parametric study on flexural performance and failure modes of NSM CFRP-strengthened concrete beams was performed by Haddad and Almomani.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear numerical simulation and experimental verification of bondline strength of CFRP strips embedded in concrete for NSM strengthening applications

Mosallam

Ghabban

Mirnateghi

et al. 2022

Structural Concrete

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This article presents results of an investigation that focuses on assessing bondline strength of carbon/epoxy fiber reinforced polymeric (CFRP) precured strips embedded in concrete for near-surface-mounting (NSM) strengthening applications. In this study, experimental evaluation and nonlinear numerical analysis of CFRP/concrete interfacial bond behavior are investigated. In this study, 15 pullout tests were performed on different reinforced concrete (RC) U-shaped column specimens with different NSM groove configurations to evaluate the effect of groove size, groove depth, and adhesive bondline thickness on overall performance of the CFRP-NSM system and to identify the optimum groove dimensions. Experimental results indicated that changing groove geometries of the NSM-FRP reinforcements significantly affect bondline strength and associated mode of failures of NSM-CFRP system. It was also shown that increasing bondline length lead to an increase in ultimate failure load and CFRP rupture strain. Based on results of this study, NSM materials with lower longitudinal moduli and higher rupture strains (e.g., E-glass/epoxy or basalt/epoxy), may increase toughness and enhance performance of the NSM strengthening system.

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Shear strengthening of RC beams using NSM CFRP bonded using cement-based adhesive

Cited by 50 publications

References 20 publications

Experimental Study on Effects of Additional Prestressing Using Fiber Reinforced Polymers and Strands on Deterioration of PSC Bridge Structure

Experimental Study on Effects of Additional Prestressing Using Fiber Reinforced Polymers and Strands on Deterioration of PSC Bridge Structure

Experimental study on performance of CFRP-strengthened RC beams with geopolymer and epoxy

Nonlinear numerical simulation and experimental verification of bondline strength of CFRP strips embedded in concrete for NSM strengthening applications

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