Effect of graphene oxide on the rheological properties of cement pastes

Shang, Yu; Zhang, Dong; Yang, Chao; Liu, Yanyun; Liu, Yong

doi:10.1016/j.conbuildmat.2015.07.181

Cited by 241 publications

(136 citation statements)

References 22 publications

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“…% was approximately 20% after 7 days. However, this is inconsistent with the optimal content of GO in the OPC system, which is approximately 0.03% -0.04%, as reported in previous studies [14,19,28]. Interestingly, the data of the compressive strengths of all the specimens with the addition of GO showed a slight decreasing tendency, except for GM-1 at 28 days, quite different from the trend for OPC [13-14, 18-19, 28].…”

Section: Fluidity and Mechanical Properties Of Aas Mortarscontrasting

confidence: 67%

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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Section: Fluidity and Mechanical Properties Of Aas Mortarscontrasting

confidence: 67%

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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“…The increase in yield stress values for graphene-cement paste might be due to higher surface area of graphene due to which it requires more amount of water for lubrication of graphene [33]. Shang et al [6] carried out experimental investigation to study the effect of graphene oxide on rheological properties of cement paste and found that in comparison to plain cement, the value of yield stress increased by approximately four times for 0.08% of graphene oxide cement paste. It was noticed that negatively charged graphene nanoplatelets in water interacted with cement particles by electrostatic interaction and formed flocs.…”

Section: Rheological Characteristics Of Gnp-cement Compositementioning

confidence: 99%

“…Wang et al [7] also detected the increase in flocculation structures having higher dosage of graphene oxide (GO) in cement paste. According to literature [6], these large agglomerates entrap some water molecules, which reduce the content of free available water. Therefore, it can be concluded that by keeping the water cement (w/c) ratio constant, the values of rheological parameters will increase.…”

Section: Rheological Characteristics Of Gnp-cement Compositementioning

confidence: 99%

“…With the advancement in nanotechnology, researchers are emphasizing more on the effect of nanomaterials on cement composite [3]. Numerous researchers studied the effect of various engineered nanomaterials on flow characteristics of the cement paste [4][5][6] and most of the research was focused on the rolled sheets of graphene and its derivatives, i.e., CNTs (carbon nanotubes) and graphene oxide [6][7][8]. However, the rheological properties of graphene cement paste remained unexplored and rarely reported.…”

Section: Introductionmentioning

confidence: 99%

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A Sustainable Graphene Based Cement Composite

et al. 2017

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Abstract:The rheological properties of fresh cement paste with different content of graphene nanoplatelets (GNPs), different shear rate cycles and resting time was investigated. The rheological data were fitted by the Bingham model, Modified Bingham model, Herschel-Bulkley model and Casson model to estimate the yield stress and plastic viscosity, and to see trend of the flow curves. The effectiveness of these rheological models was expressed by the standard error. Test results showed that yield stress and plastic viscosity increased with the increase in the content of graphene in the cement based composite and resting time while the values of these parameters decreased for higher shear rate cycle. In comparison to control sample, the GNP cement based composite showed 30% increase in load carrying capacity and 73% increase in overall failure strain. Piezo-resistive characteristics of GNP were employed to evaluate the self-sensing composite material. It was found that, at maximum compressive load, the electrical resistivity value reduced by 42% and hence GNP cement based composite can be used to detect the damages in concrete. Finally, the practical application of this composite material was evaluated by testing full length reinforced concrete beam. It was found that graphene-cement composite specimen successfully predicted the response against cracks propagation and hence can be used as self-sensing composite material.

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“…Nano-materials have been shown to improve the microstructure and comprehensive performance of cement composites [2]. However, due to small particle size, large specific surface area and high surface energy of nano-materials, the use of nano-materials in cement matrix causes the high water consumption and agglomeration [3].…”

Section: Introductionmentioning

confidence: 99%

Study on the Dispersion of Graphene Oxide in Cement Composites

2018

2018 3rd International Conference on Materials Science, Machinery and Energy Engineering (MSMEE 2018)

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Abstract:The effects of DAs with different DA to GO mass ratio on the GO dispersion and agglomeration were observed in simulated concrete pore solution (SCPS) and cement pastes. The ions and pH of cement pastes increased with the amount of cement increasing, which caused the separation of P-HRWR from the GOs. Thus, GOs were absorbed on the surface of the cement particle resulting in GOs sedimentation.

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Effect of graphene oxide on the rheological properties of cement pastes

Cited by 241 publications

References 22 publications

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

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

A Sustainable Graphene Based Cement Composite

Study on the Dispersion of Graphene Oxide in Cement Composites

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