Experimental investigation on mechanical and piezoresistive properties of cementitious materials containing graphene and graphene oxide nanoplatelets

Liu, Qiong; Xu, Qiwei; Yu, Qiang; Gao, Rundong; Tong, Teng

doi:10.1016/j.conbuildmat.2016.10.024

Cited by 142 publications

(63 citation statements)

References 32 publications

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“…The usual expectation is that adding GO in cement pastes should only accelerate cement hydration [7]. This is because GO (even if only present in aggregated form [5,25,26]) serves as an extra surface for the growth of hydration precipitates [9,10,12,14,16], which increases the rate of precipitation and drives the overall rate of hydration reactions towards acceleration [5]. However, results shown in Fig.…”

Section: Effect Of Go On the Hydration Of Clinkermentioning

confidence: 98%

“…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%

“…Some suggest that GO serves for the nucleation of hydration precipitates, causing a higher degree of hydration [9,10,12,14,16]. Others propose that GO reinforces the paste matrix at the nano-scale [11,15,17,18,20,25,26].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Understanding the behaviour of graphene oxide in Portland cement paste

Ghazizadeh

Duffour

Skipper

et al. 2018

Cement and Concrete Research

130

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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: Effect Of Go On the Hydration Of Clinkermentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Understanding the behaviour of graphene oxide in Portland cement paste

Ghazizadeh

Duffour

Skipper

et al. 2018

Cement and Concrete Research

130

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“…Outstanding electrical properties and low cost make graphene nanoplatelets (GNPs) an attractive nanomaterial for use in smart self-sensing concrete. As demonstrated by recent studies [62], the addition of 1.6 wt% of GNPs (a surface area of 192 m 2 /g, a diameter of 6.8 μm, and a thickness of 5.0 nm) decreases more than one order of magnitude the resistivity of tested composites, thus attaining the percolation point, above which GNPs form the continuous conductive network in cement matrix. Interestingly, during the piezoresistive tests under compression, it turned out that no piezoresistive reactions were detected for samples containing 1.6 wt% of GNPs, indicating that conductive network created by tunneling of GNPs is unstable under applied loading.…”

Section: Self-monitoring Materialsmentioning

confidence: 57%

Nanomaterials in Structural Engineering

Krystek¹,

Górski²

2018

New Uses of Micro and Nanomaterials

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Development of structural engineering, daring structures with record spans or heights, meets two serious obstacles-the limitations of traditionally used materials and the need of continuous monitoring of new structures subjected to complex loads, including those of dynamic nature. Considering the responsibility for the life of people and the budget of new structures, the need of constant monitoring is inevitable. This is why structural engineers seek for new solutions; among them, smart structures based on self-monitoring materials seem to be one of the most attractive proposals. It is still an unexplored area, but current research shows a high potential of the use of composites reinforced by carbon-based nanomaterials as self-sensing structural materials. Nanomaterials also influence other important features of structural materials, such as microstructure, mechanical, and transport-related properties. In this chapter, we present the state of art of the use of nanomaterials in structural engineering in various areas including mechanical and electrical properties as well as issues referring to durability.

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“…However, these types of adhesives usually suffer from low fracture toughness. In order to improve the mechanical behavior of adhesive joints, researchers have proposed several methods such as modifying the adhesive joint geometry [1,3] and adhesive layer reinforcement by adding nano, micro and macro additives [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Considering the nano-scale modification, several nonoadditives of various shapes and materials including single-walled carbon nano-tube [4], multi-walled carbon nano-tube [5,6], graphene and graphene oxide nano-platelet [7,8], nano-silica [9,10], silicon carbide whisker [11,12], nano-rubber [13,14] and nano-clay [15] have been widely investigated in order to improve mechanical properties of the adhesives.…”

Section: Introductionmentioning

confidence: 99%

Fracture assessment of polyacrylonitrile nanofiber-reinforced epoxy adhesive

Razavi

Neisiany

Ayatollahi

et al. 2018

Theoretical and Applied Fracture Mechanics

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Electrospun polyacrylonitrile (PAN) nanofibers were incorporated in an epoxy-based adhesive layer to improve the adhesive joint's mechanical performance. The morphological study of the electrospun PAN nanofibers revealed that the fabricated nanofibers were smooth, continuous, and without beads. The average diameter of the nanofibers was determined to be 362 ± 87 nm. The Double Cantilever Beam (DCB) specimens were tested and the fracture energies were determined for the unreinforced and reinforced adhesives. The outstanding reinforcing capability of PAN nanofibers was demonstrated by significant improvements in fracture energy of the adhesive containing PAN nanofibers. A maximum improvement of 127% in the mode I fracture energy of adhesive was achieved by incorporating 2 g/m 2 of PAN nanofibers into the adhesive layer. Moreover, the morphology of the fracture surfaces was examined using the Scanning Electron Microscopy (SEM) technique to evaluate the toughening mechanisms resulting from this improvement.

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Experimental investigation on mechanical and piezoresistive properties of cementitious materials containing graphene and graphene oxide nanoplatelets

Cited by 142 publications

References 32 publications

Understanding the behaviour of graphene oxide in Portland cement paste

Understanding the behaviour of graphene oxide in Portland cement paste

Nanomaterials in Structural Engineering

Fracture assessment of polyacrylonitrile nanofiber-reinforced epoxy adhesive

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