Mechanism of cement paste reinforced by graphene oxide/carbon nanotubes composites with enhanced mechanical properties

Lu, Zeyu; Hou, Dongshuai; Meng, Lingshi; Sun, Guoxing; Lu, Cong; Li, Zongjin

doi:10.1039/c5ra18602a

Cited by 220 publications

(79 citation statements)

References 19 publications

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“…More specifically, the GO with an extra high specific area provides a template in the AAS system so that the C-(A)-S-H gel can grow on the surface of the GO due to the cross-linking between the functional groups on the GO and the divalent ions in the gel [22]. Hence, significant reinforcement of the AAS 10 by the GO can be attributed to strong interfacial adhesion between the GO and C-(A)-S-H [41,42].…”

Section: Microstructural Investigationsmentioning

confidence: 99%

Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement

Zhu

Kang

Yang

et al. 2017

Construction and Building Materials

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Highlights:(1) Graphene Oxide (GO) caused a significant reduction in fluidity and a slight decrease in compressive strength of AAS mortars.(2) The flexural strength of hardened mortars were improved by adding GO.(3) Layered double hydroxides (LDHs) were observed and confirmed in GO-added AAS system. AbstractDue to its high aspect ratio and outstanding tensile strength, graphene oxide (GO) can dramatically reduce the brittleness of cement-based materials. In this paper, GO nanosheets were successfully synthesised using the modified Hummers' method. Effects of the GO on the fluidity, mechanical properties of alkali-activated slag (AAS) mortars and the microstructure of the AAS pastes were studied.It is found that addition of the GO caused a significant reduction in fluidity and a slight decrease in the compressive strength of the hardened mortars. However, the GO improved the flexural strengths by 20% with a dosage of 0.01 wt. % after 7 days. Large-scale layered double hydroxides (LDHs) were observed using SEM, the compositions of which were identified and EDS and XRD. A possible mechanism of the formation of LDHs in the GO-AAS system is proposed. Due to the Mg 2+ /Al 3+ decomposed from the slag and the Al(OH)4 -formed in the high pH condition in the GO-AAS system, the reaction pathway of LDHs 2 can be regarded as a , This research provides a further understanding of the effect of graphene oxide which has a potential application of GO in AASC.

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Section: Microstructural Investigationsmentioning

confidence: 99%

Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement

Zhu

Kang

Yang

et al. 2017

Construction and Building Materials

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“…Due to its good dispersity in water, high aspect ratio and satisfied mechanical properties, GO has become a good candidate to reinforce cementitious materials. Lu et al [16] demonstrated that 0.05 wt.% GO led to 11.1% and 16.2% increase in compressive strength and flexural strength of the cement paste. Duan et al [17] found that 0.03 wt.…”

Section: Introductionmentioning

confidence: 98%

Effects of graphene oxide on the properties and microstructures of the magnesium potassium phosphate cement paste

Hou

et al. 2016

Construction and Building Materials

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115

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“…However, their inherent cracks due to lesser tensile strength and strain capacity constitute a main drawback. [1][2][3][4][5][6] As we know, graphene oxide (GO) has many unique properties, such as excellent mechanical properties, high surface functionalization, high surface area and good dispersibility in aqueous solvents. Also, there contains many active groups in the GO sheet, such as carboxyl group (-COOH) on the edges of GO sheets, epoxy group (-CH(O)CH-) and hydroxyl group (-OH) on the basal planes.…”

Section: Introductionmentioning

confidence: 99%

Adsorption characteristics of graphene oxide nanosheets on cement

Wang

Yao

et al. 2016

RSC Adv.

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aThe graphene oxide (GO) nanosheets modified cement tremendously improved their mechanical properties but decreased the fluidity. The adsorption characteristics between GO and cement plays a pivotal role for the influence on fluidity. In this paper, the adsorption characteristics of graphene oxide nanosheets on cement were investigated by scanning electron microscope (SEM), total organic carbon (TOC), Fourier transform infrared spectra (FTIR) and XPS. The results show that GO nanosheets have a strong adsorption ability on the cement surface. And the adsorption data was best fitted with the Freundlich adsorption isotherm model and described by the pseudo-second order kinetics model, the adsorption process contained the chemical reaction that the -COOH on the edge of GO nanosheets reacted with the metal cations. The adsorption layer thickness of GO nanosheets on cement was about 10.16 nm.

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Mechanism of cement paste reinforced by graphene oxide/carbon nanotubes composites with enhanced mechanical properties

Abstract: This paper presented the enhanced mechanical properties of cement paste reinforced by graphene oxide (GO)/carbon nanotubes (CNTs) composites. The space interlocking mechanism of the GO/CNTs/cement paste composite was proposed.

Cited by 220 publications

References 19 publications

Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement

Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement

Effects of graphene oxide on the properties and microstructures of the magnesium potassium phosphate cement paste

Adsorption characteristics of graphene oxide nanosheets on cement

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