Effect of carbon nanotubes on strengthening of RC beams retrofitted with carbon fiber/epoxy composites

Irshidat, Mohammad R.; Al‐Saleh, Mohammed H.; Almashagbeh, Hashem

doi:10.1016/j.matdes.2015.09.166

Cited by 56 publications

(21 citation statements)

References 58 publications

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“…Study of the mechanisms of the fracture toughness of CFRP is mainly governed by the subsequent debonding appearance, i.e., debonding between the carbon fiber (CF) and polymer matrix, fiber pull-out, and delamination between the CFRP sheets. Therefore, many researchers have studied how to toughen the epoxy resins using nanoparticles such as nanosilica, nanohalloysite, carbonaceous nanoparticles like graphene nanoplatelets, and graphene oxide [7][8][9][10][11][12][13]. However, large scale CFRP production using nanofillers has been a challenge due to many unsolved problems such as nanoparticle agglomeration or achieving homogeneous dispersion of nanoparticles of a high weight/volume portion in resins while maintaining relatively low viscosity.…”

Section: Introductionmentioning

confidence: 99%

Polydopamine as sizing on carbon fiber surfaces for enhancement of epoxy laminated composites

Han

Zhang

Tavakoli

et al. 2018

Composites Part A: Applied Science and Manufacturing

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Please cite this article as: Han, W., Zhang, H-P., Tavakoli, J., Campbell, J., Tang, Y., Polydopamine as sizing on carbon fiber surfaces for enhancement of epoxy laminated composites, Composites: Part A (2018), doi: https:// Abstract Carbon fiber reinforced polymer (CFRP) laminate normally has plastic dominant crack propagation behavior, inducing potential insecurity in the safety and reliability of structures in practical applications. In this study, we report a simple process to increase the stability of crack growth by using polydopamine (PDA) as sizing on the surface of carbon fiber (CF) fabric. The crack propagation behavior changes from a saw-toothshaped curve in neat CFRP laminate to a relatively smooth trending curve in PDA coated CFRP laminate with increased Mode I interlaminar fracture toughness. Enhanced impact strength and interlaminar shear strength of PDA coated CFRP laminates is also observed.A single fiber pull-out experiment and morphological study reveal that, with PDA coating on CF fabrics, cracks tend to fracture through the epoxy matrix rather than between fiber and matrix interfaces. The use of PDA as sizing on the CF contributes to improving the load transfer between the CF and the polymer matrix by enhancing the interfaces between the epoxy and the CF, increasing the friction of the fractured interface, reducing unstable crack growth, and thereby enhancing interfacial fracture toughness and impact performance.

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Section: Introductionmentioning

confidence: 99%

Polydopamine as sizing on carbon fiber surfaces for enhancement of epoxy laminated composites

Han

Zhang

Tavakoli

et al. 2018

Composites Part A: Applied Science and Manufacturing

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“…Among the inorganic nanofillers, due to the excellent physical and mechanical properties, as well as high aspect ratio, carbon nanotube (CNT) is regarded as a promising reinforcement phase for polymer composites. However, the issues associated with the reinforcing effect of CNTs in the polymer composites are their agglomeration and the lack of interfacial interactions with resin matrix, which would lead to the undesirable properties of the resulting composites .…”

Section: Introductionmentioning

confidence: 99%

Effect of different amino functionalized carbon nanotubes on curing behavior and mechanical properties of carbon fiber/epoxy composites

Zhang

Gao

et al. 2016

Polymer Composites

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Epoxy‐amine system is a type of important matrix material for preparation of carbon fiber composites. The amidation of carbon nanotubes (CNTs) has been widely developed for enhancing the mechanical properties of the epoxy resin matrix. However, the various amino‐functionalized CNTs will produce different effect in the same epoxy matrix due to the diversity in reactivity, compatibility, and dispersion stability. In this paper, the amino‐functionalized multiwalled carbon nanotubes (MWCNTs‐NH2) were prepared through surface grafting ethylenediamine and diethyltoluenediamine (DETDA; designated as MWCNTs‐EDA and MWCNTs‐DETDA), and dispersed into epoxy resin matrix in which the DETDA was also used as curing agent. Compared with MWCNTs‐EDA, the MWCNTs‐DETDA showed a better dispersion state and stability in the epoxy resin, and had a relatively small impact on the curing behavior of epoxy matrix. After adding 0.5 wt% MWCNTs‐DETDA, the unidirectional T700 carbon fiber composites exhibited the significantly enhanced interlaminar shear strength and flexural properties due to the uniform dispersion of MWCNTs‐DETDA and the modified interface bonding. The results indicated that the chemical compatibility between MWCNTs‐NH2 and resin matrix can exert an important influence on the microstructure, curing behavior, thermo‐mechanical properties, and mechanical properties of the epoxy resin and the resulting carbon fiber composites. POLYM. COMPOS., 39:E733–E744, 2018. © 2016 Society of Plastics Engineers

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“…Taking into account excellent physical and mechanical properties, as well as high aspect ratio of carbon nanotubes (CNTs), they are believed to be a promising reinforcement phase for polymer composites among inorganic nanofillers [ 14 ]. Analysis of scientific literature was shows that often when CNTs were introduced into epoxy composites, there was no significant increase in the strength of epoxy composites, and sometimes this even was leads to its decrease, which is associated with poor adhesion between CNTs and the epoxy matrix and with the fact that CNTs are energetically more favorable to aggregate with each other [ 16 , 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Epoxy Nanocomposites Reinforced with Functionalized Carbon Nanotubes

et al. 2020

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In this article, amino functionalized multiwalled carbon nanotubes (MWCNTs) were prepared by chemical modification of the surface of a MWCNTs using γ-aminopropyltriethoxysilane (APTES) and dispersed into the epoxy composition. The modifying agent (APTES) was directly deposited on the MWCNTs surfaces. For the functionalization of MWCNTs, was used not the APTES concentrate, as it had been described in previous works, but its freshly prepared aqueous solution. Properties of APTES-treated MWCNTs were characterized by transmission electron microscope (TEM), Raman spectroscopy and FT-IR. The results showed that the functionalization and chemical compatibility of APTES-treated MWCNTs with epoxy composition provides their best dispersion in the epoxy composition, had important influence on curing behavior, structure and physicochemical properties of the epoxy composites plasticized with trichloroethyl phosphate. The results showed that the functionalization and chemical compatibility of APTES-treated MWCNTs with epoxy composition provides increased of physicomechanical properties of epoxy composites: bending stress increases by 194% and bending modulus increases by 137%, the tensile strength increases by 108% and the tensile elastic modulus increases by 52%, impact strength increases by 300%, in comparison with plasticized epoxy composite that does not contain MWCNTs.

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Effect of carbon nanotubes on strengthening of RC beams retrofitted with carbon fiber/epoxy composites

Cited by 56 publications

References 58 publications

Polydopamine as sizing on carbon fiber surfaces for enhancement of epoxy laminated composites

Polydopamine as sizing on carbon fiber surfaces for enhancement of epoxy laminated composites

Effect of different amino functionalized carbon nanotubes on curing behavior and mechanical properties of carbon fiber/epoxy composites

Epoxy Nanocomposites Reinforced with Functionalized Carbon Nanotubes

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