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

Lu, Zeyu; Hou, Dongshuai; Ma, Hongyan; Fan, Tian-Yuan; Li, Zongjin

doi:10.1016/j.conbuildmat.2016.05.060

Cited by 115 publications

(38 citation statements)

References 21 publications

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“…Previous studies have claimed that adding GO to cement pastes or mortars improves the compressive, flexural and tensile strengths of these systems. The strength improvements were found to occur in systems made of Portland cement (PC) [7,[9][10][11][12][13][14][15][16][17][18][19][20], alkali activated slag [21] and magnesium phosphate [22]. The majority of these studies assumed that GO layers were well dispersed in the paste matrix.…”

Section: Introductionmentioning

confidence: 99%

Understanding the behaviour of graphene oxide in Portland cement paste

Ghazizadeh

Duffour

Skipper

et al. 2018

Cement and Concrete Research

131

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This study reports on the effect of graphene oxide (GO) on the hydration of Portland cement (PC) and industrial clinker. GO accelerates PC hydration, whereas it temporarily retards that of clinker. This difference reflects a twofold behaviour of GO in cement pastes. Retardation is due to the interaction of GO with the surface of hydrating grains, while acceleration results from a seeding effect. Gypsum causes this difference. GO is shown to have little effect on the strength of hardened pastes, and this merely relates to the change of hydration degree, as opposed to reinforcing effect formerly assumed. Overall, GO is not particularly active as a nucleation surface, as it aggregates and behaves in a similar way to inert fillers (e.g. quartz). Polycarboxylate-ether copolymer could make GO an active seed in cement pastes, as it prevents GO from aggregating. Nevertheless, this was found to occur only in alite pastes but not PC pastes.

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Section: Introductionmentioning

confidence: 99%

Understanding the behaviour of graphene oxide in Portland cement paste

Ghazizadeh

Duffour

Skipper

et al. 2018

Cement and Concrete Research

131

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“…carbon nanofibres, carbon nanotubes and graphene, has offered an opportunity to improve the toughness of cement-based materials [13]. The combination of cement with a small amount of carbon material has an admirable impact on the mechanical behaviour of OPC and other inorganic cements [13][14][15][16]. Of all of the carbon-based materials, two-dimensional (2D) graphene oxide (GO) sheets with an ultra-high dispersibility and a superior aspect ratio compared to other nano-carbon materials show a suitable performance in a cement matrix [13,17].…”

Section: Introductionmentioning

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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“…Various composite materials have been developed from the matrix of magnesium phosphate cement. Lu, Hou, Ma, Fan, and Li (2016) added different proportions of graphene oxide in order to increase their mechanical strength, determining an ideal proportion of 5 wt.% of graphene. The addition of graphene oxide decreases the workability of the magnesium phosphate cement paste, modifying setting times from 15 minutes to 11 minutes.…”

Section: Magnesium Phosphate Cementsmentioning

confidence: 99%

“…However, the compressive and flexural strength improves, with values of 40,61 MPa and 6,82 MPa, respectively. This can also be explained by the decrease in porosity and a greater degree of hydration of the paste (Lu et al, 2016).…”

Section: Magnesium Phosphate Cementsmentioning

confidence: 99%

Engineering applications of chemically-bonded phosphate ceramics

Balaguera

Botero

2019

Ing. Inv.

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Phosphate cements originated more than a century ago for specific applications to the field of dentistry. These cements have other applications including: biomaterials with bone applications, stabilization of hazardous waste, and structural cements. However, the applications in civil infrastructure are recent and not widely known. Therefore, this review discusses and analyzes phosphate cements, presenting the most significant findings of the research to address their mechanical behavior of these cements. It also describes the impact and application of phosphate cements as a structural product (pastes, mortars and concretes), in addition to typical values of mechanical strength, workability, commercial applications, etc. As a result, the review allows to elucidate advantages and disadvantages in comparison with existing technologies and the mechanical possibilities of these cements as biomaterials and for the immobilization of radioactive waste.

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

Cited by 115 publications

References 21 publications

Understanding the behaviour of graphene oxide in Portland cement paste

Understanding the behaviour of graphene oxide in Portland cement paste

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

Engineering applications of chemically-bonded phosphate ceramics

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