Reactive molecular dynamics and experimental study of graphene-cement composites: Structure, dynamics and reinforcement mechanisms

Hou, Dongshuai; Lu, Zeyu; Li, Xiangyu; Ma, Hongyan; Li, Zongjin

doi:10.1016/j.carbon.2017.01.013

Cited by 330 publications

(134 citation statements)

References 47 publications

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“…[25,30] Due to a large amount of oxygen functional groups attached on the GO sheets and its high specific surface area, GO promotes the growth of cement hydration crystals by the nucleation effect. [40] This particular composite has emerged as a material with the decreased compressive and flexural strength. [26] While the potential application of graphene oxide in cement composites has been extensively studied in recent years, similar research involving graphene, to date, remained limited.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Graphene‐Based Cementitious Composites

et al. 2019

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This study reports on the development of a cementitious composite incorporating electrochemically exfoliated graphene (EEG). This hybrid functional material features significantly enhanced microstructure and mechanical properties, as well as unaffected workability; thus, it outperforms previously reported cementitious composites containing graphene derivatives. The manufacturing of the composite relies on a simple and efficient method that enables the uniform dispersion of EEG within cement matrix in the absence of surfactants. Different from graphene oxide, EEG is found to not agglomerate in cement alkaline environment, thereby not affecting the fluidity of cementitious composites. The addition of 0.05 wt% graphene content to ordinary Portland cement results in an increase up to 79%, 8%, and 9% for the tensile strength, compressive strength, and Young's modulus, respectively. Remarkably, it is found that the addition of EEG promotes the hydration reaction of both alite and belite, thus leading to the formation of a large fraction of 3CaO·2SiO 2 ·3H 2 O (C‐S‐H) phase. These findings represent a major step forward toward the practical application of nanomaterials in civil engineering.

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Section: Introductionmentioning

confidence: 99%

High‐Performance Graphene‐Based Cementitious Composites

et al. 2019

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“…They do this because they adsorb on the surface of hydrating particles and hinder the dissolution of cement and/or precipitation of hydration products [34][35][36][37]. However, this may not be the case for GO as it has been shown to accelerate cement hydration [5,38].…”

Section: Introductionmentioning

confidence: 99%

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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“…Considerable efforts have been made by various researchers to investigate the mechanisms of chloride diffusion and penetration [5][6][7][8][9][10][11][12][13]. A numerical method has been developed that is capable of simulating chloride migration on a meso-or micro-scale and explains how chloride penetration takes place in concrete [5][6][7][14][15][16][17][18]. While researchers focus on this fundamental process in-depth, there appears to be a gap in the understanding of the interaction between the environment and concrete structures [19,20].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Chloride Distribution for Offshore Concrete Based on Statistical Analysis

Liu

et al. 2020

Materials

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Chloride-induced corrosion is the main threat to the service life of concrete structures. In order to better investigate chloride distribution in offshore concrete, this study proposed a new prediction model based on statistical analysis as well as a large body of experimental results collected from various sources. A detailed discussion found that the key influential parameters, such as diffusion coefficient ( D ), surface chloride concentration ( C S ) and penetration depth ( x ) are all highly time-dependent. The exposure zone, water–cement ratio and service time were also considered as relevant factors. The proposed model is then validated by two alternative tests and the results suggest that it is feasible in predicting the chloride content and penetration depth of concrete structures in a marine environment under chloride attack.

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Reactive molecular dynamics and experimental study of graphene-cement composites: Structure, dynamics and reinforcement mechanisms

Cited by 330 publications

References 47 publications

High‐Performance Graphene‐Based Cementitious Composites

High‐Performance Graphene‐Based Cementitious Composites

Understanding the behaviour of graphene oxide in Portland cement paste

Prediction of Chloride Distribution for Offshore Concrete Based on Statistical Analysis

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