Micro-mechanical properties and multi-scaled pore structure of graphene oxide cement paste: Synergistic application of nanoindentation, X-ray computed tomography, and SEM-EDS analysis

Long, Wu-Jian; Gu, Yu-cun; Xiao, Bing-Xu; Zhang, Qiming; Xing, Feng

doi:10.1016/j.conbuildmat.2018.05.229

Cited by 76 publications

(14 citation statements)

References 62 publications

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“…The 20-mm cube samples were polished for the nanoindentation experiments. We referred to the study conducted by Long et al for details pertaining to the loading, holding, and rapid unloading phases [28]. The maximum indentation force was 600 µN, and the indentation depth was less than 300 nm.…”

Section: Nanoindentation Mechanical Analysismentioning

confidence: 99%

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Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

Long

Tang

et al. 2019

Materials

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Coral aggregate has been widely used for island construction because of its local availability. However, the addition of coral aggregate exaggerates the brittle nature of cement-based materials under dynamic loading. In this study, polyvinyl alcohol (PVA) fiber was used to improve dynamic mechanical behavior of seawater coral mortars (SCMs). The effects of coral aggregate and PVA fiber on the workability, static mechanical strengths, and dynamic mechanical behavior of fiber-reinforced SCMs were investigated. Results showed that the workability of the SCM decreased with increasing coral aggregate replacement rate and PVA fiber content. Mechanical strengths of the SCM increased with increasing PVA fiber content, but decreased with increasing coral aggregate replacement rate. Dynamic mechanical behavior at varying coral aggregate replacement rates was analyzed by combining dynamic mechanical analysis and micro-scale elastic modulus experiment. With increasing coral aggregate replacement rate, the storage modulus, loss factor, and elastic modulus of the interfacial transition zone in the SCM decreased. Nevertheless, with the incorporation of PVA fibers (1 vol.%), the storage modulus and loss factor were improved dramatically by 151.9 and 73.3%, respectively, compared with the reference group. Therefore, fiber-reinforced coral mortars have a great potential for use in island construction, owing to the excellent anti-vibrational performance.

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Section: Nanoindentation Mechanical Analysismentioning

confidence: 99%

“…The load-depth curves were recorded to obtain the micromechanical properties of the SCM. To analyze the experiment data, the analytical method proposed by Oliver and Pharr was used to calculate the elastic modulus from the load-penetration curve [28].…”

Section: Nanoindentation Mechanical Analysismentioning

confidence: 99%

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

Long

Tang

et al. 2019

Materials

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“…From a three-dimensional perspective, Long et al [22] have demonstrated that GO had a certain enhancement effect on the elasticity modulus of cement paste. He et al [23] found that the water suspension of GO nanosheets could help maintaining the moisture in cement paste and reducing the shrinkage of concrete.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Shrinkage Behavior of Concrete-Containing Graphene-Oxide Nanosheets

Chen

Hua

et al. 2020

Materials

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Graphene oxide (GO) has been widely used as an additive due to its numerous unique properties. In this study, the compressive strength, flexural strength and elasticity modulus of concrete containing 0.02 wt%, 0.05 wt % and 0.08 wt % GO, and its dry shrinkage performance have been experimentally investigated. After the sample preparation, apparatus for compression test and flexural test were used to test the relevant properties of concrete containing GO. The dial indicators were used to measure the shrinkage of samples. The results indicate that GO can considerably improve the compressive strength, flexural strength, and elasticity modulus of concrete at the concrete age of 28 days by 4.04–12.65%, 3.8–7.38%, and 3.92–10.97%, respectively, which are substantially smaller than the increment at the age of 3 d by 5.02–21.51%, 4.25–13.06%, and 6.07–27.45% under a water-cement ratio of 0.35. It was also found that GO can increase the shrinkage strain of concrete. For example, at the age of 60 days, 0.02 wt%, 0.05 wt% and 0.08 wt% GO can increase the shrinkage strain of ordinary concrete by 1.99%, 5.79% and 7.45% respectively under a water-cement ratio of 0.49. The study has advanced our understanding on mechanical and shrinkage behavior of concrete containing GO.

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“…As a carbon-based nanomaterial, graphene oxide (GO) consists of several layers of wrinkled two-dimensional carbon sheet with various oxygen-containing functional groups, which is highly dispersible in water and possesses excellent mechanical properties [6,7]. Existing studies have confirmed that GO can regulate the hydration products of cement and significantly improve the mechanical properties of cement composites [8][9][10][11][12]. Xu [13] and Hou [14] examined the role of GO in cement composites by using experiments and a molecular dynamics (MD) simulation.…”

Section: Introductionmentioning

confidence: 99%

The Role of Graphene Oxide on the Hydration Process and Chemical Shrinkage of Cement Composites

Xu¹

2020

Ceramics - Silikaty

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Graphene oxide (GO) has attracted increasing attention for its application in cementitious materials as it can be used to regulate the hydration products of cement and improve the properties of cement composites. This paper investigated the role of GO on the hydration process and chemical shrinkage of a cement paste through an experimental study and molecular dynamics simulation. The hydration heat flow of a cement composite with GO (CCG) was characterised by using an isothermal calorimeter. The chemical shrinkage of the CCG was also measured by applying a modified method based on ASTM C1608. The test results have shown that incorporating GO can mainly accelerate the hydration rate of cement composites at the early stage, but would not change the four-stage process of the cement hydration. The addition of GO by 0.3 wt% of cement is able to reduce the chemical shrinkage of the cement composites. This regulation effect is mainly attributed to the hydrogen bonding, which has been verified by the molecular dynamics simulation.

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Micro-mechanical properties and multi-scaled pore structure of graphene oxide cement paste: Synergistic application of nanoindentation, X-ray computed tomography, and SEM-EDS analysis

Cited by 76 publications

References 62 publications

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

Mechanical Properties and Shrinkage Behavior of Concrete-Containing Graphene-Oxide Nanosheets

The Role of Graphene Oxide on the Hydration Process and Chemical Shrinkage of Cement Composites

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