Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars

Qi, Xiaoqiang; Zhang, Sulei; Wang, Tengteng; Guo, Siyao; Rui, R.

doi:10.3390/ma14040915

Cited by 33 publications

(3 citation statements)

References 47 publications

(53 reference statements)

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“…Studies have shown that the addition of nanomaterials, such as 0D nanosilica [ 2 , 3 ], 1D carbon nanotubes [ 4 ], and 2D graphene oxide (GO) [ 5 , 6 ], can improve the strength, toughness, and durability of cement composites to varying degrees. Compared to 0D and 1D nanomaterials, GO has a significantly larger specific surface area, which helps facilitate its interactions with cement hydration products and provides a physical barrier in an aggressive environment [ 7 ]. Zeng et al [ 8 ] demonstrated that GO nanosheets with large aspect ratios are more conducive to reducing both porosity and permeability.…”

Section: Introductionmentioning

confidence: 99%

Efficient Use of Graphene Oxide in Layered Cement Mortar

Liu

Chen

et al. 2022

Materials

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Graphene oxide (GO) has been found to be an attractive nanomaterial to improve the properties of cementitious composites. However, the use of GO in the industry is limited by its high cost. To achieve a higher cost/performance ratio, GO can be strategically applied in certain parts of cementitious composites structure according to the principle of functionally graded materials. In this study, graded distribution of GO in cement mortar was achieved by sequentially casting a fresh GO-incorporated cement layer on another cement mortar layer. The mechanical properties, especially flexural strength, of layered cement mortar were found to be dependent on the GO content, the delay time, and the interface formed due to layering fabrication. With the GO incorporated in the tensile region only (30% of the total depth), the flexural strength of the layered beam attained 90.91% of that of the beam, with GO uniformly distributed throughout the sample. Based on the results of rapid chloride migration tests, when 12 mm GO-incorporated cement mortar layer was used, the chloride migration coefficient was reduced by 21.45%. It was also found that the measured chloride migration coefficient of layered cement mortar agreed with the series model. The present investigation provides an efficient approach to use GO in cement-based materials from the perspective of mechanical and durability properties.

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Section: Introductionmentioning

confidence: 99%

Efficient Use of Graphene Oxide in Layered Cement Mortar

Liu

Chen

et al. 2022

Materials

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“…The additives, which work as initializers of crystallization, can affect the hydration processes and create the conditions for the formation of a structure with predefined properties. Today, there are a significant number of papers on the structuring of the cement matrix due to the effects of ultrafine additives on the morphology of cement hydration products [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrafine Additives on the Morphology of Cement Hydration Products

et al. 2021

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The present research is focused on the investigation of the influence of ultrafine additives on the structure formation of hardened cement paste and the establishment of the mechanisms of the morphological transformations, which determine the properties of hydrated products. In the course of the research, the modification of ordinary Portland cement was performed by the suspension of multi-walled carbon nanotubes (MWCNTs), carbon black (CB) paste, and silica fume (SF). Scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) microanalysis, X-ray diffraction (XRD) analysis, thermal analysis, and Fourier-transform infrared (FTIR) spectroscopy were used to study cement hydration products. The morphology of hardened cement paste depends on the chemical reactivity of additives, their geometry, and their genesis. The action mechanism of the inert carbon-based additives and pozzolanic silica fume were considered. The cement hydration products formed in the process of modification by both types of ultrafine additives are described. In the case of the modification of cement paste by inert MWCNTs and CB paste, the formation of cement hydration products on their surface without strong adhesion was observed, whereas in the case of the addition of SF separately and together with MWCNTs, the strong adhesion of additives and cement hydration products was noted.

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“…It has been demonstrated by researchers that the reinforced performance of graphene nanoplatelets (GPLs) is significantly superior to other reinforcement materials. Adding a low concentration of GPLs can improve the stiffness and strength of reinforced composites significantly [18][19][20][21][22][23]. By introducing GPLs to FGM materials, novel FG GPLs-reinforced composite (FG-GPLRC) structures have been developed recently and have since attracted extensive attention in both research and engineering communities [24].…”

Section: Introductionmentioning

confidence: 99%

Analytical Prediction for Nonlinear Buckling of Elastically Supported FG-GPLRC Arches under a Central Point Load

et al. 2021

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In this paper, we present an analytical prediction for nonlinear buckling of elastically supported functionally graded graphene platelet reinforced composite (FG-GPLRC) arches with asymmetrically distributed graphene platelets (GPLs). The effective material properties of the FG-GPLRC arch are formulated by the modified Halpin–Tsai micromechanical model. By using the principle of virtual work, analytical solutions are derived for the limit point buckling and bifurcation buckling of the FG-GPLRC arch subjected to a central point load (CPL). Subsequently, the buckling mode switching phenomenon of the FG-GPLRC arch is presented and discussed. We found that the buckling modes of the FG-GPLRC arch are governed by the GPL distribution pattern, rotational restraint stiffness, and arch geometry. In addition, the number of limit points in the nonlinear equilibrium path of the FG-GPLRC arch under a CPL can be determined according to the bounds of successive inflexion points. The effects of GPL distribution patterns, weight fractions, and geometric configurations on the nonlinear buckling behavior of elastically supported FG-GPLRC arches are also comprehensively discussed.

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Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars

Cited by 33 publications

References 47 publications

Efficient Use of Graphene Oxide in Layered Cement Mortar

Efficient Use of Graphene Oxide in Layered Cement Mortar

Effect of Ultrafine Additives on the Morphology of Cement Hydration Products

Analytical Prediction for Nonlinear Buckling of Elastically Supported FG-GPLRC Arches under a Central Point Load

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