Mechanical properties and microstructure of a graphene oxide–cement composite

Pan, Zhu; He, Li; Qiu, Ling; Korayem, Asghar Habibnejad; Li, Gang; Zhu, Jun; Collins, Francis Gerard; Li, Dan; Duan, Wenhui; Wang, Chen

doi:10.1016/j.cemconcomp.2015.02.001

Cited by 722 publications

(377 citation statements)

References 42 publications

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“…More specifically, the GO with an extra high specific area provides a template in the AAS system so that the C-(A)-S-H gel can grow on the surface of the GO due to the cross-linking between the functional groups on the GO and the divalent ions in the gel [22]. Hence, significant reinforcement of the AAS 10 by the GO can be attributed to strong interfacial adhesion between the GO and C-(A)-S-H [41,42].…”

Section: Microstructural Investigationsmentioning

confidence: 99%

“…In alkali-activated slags with a moderate MgO content, the LDHs are identified as Mg6Al2(CO3) (OH)16·4H2O [31] or variants. In chemical engineering, the most commonly used method to synthesise LDHs on the surface of GO is to introduce divalent and trivalent cations from solution [43] and then form chemical cross-linking between the cations and the functional groups on the surface of the GO [41]. Due to a co-precipitation process, precipitation will occur, thereby leading to the in situ growth of the LDH phase [38].…”

Section: Formation Mechanism Of Ldhs In Go-added Aas Pastesmentioning

confidence: 99%

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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: Microstructural Investigationsmentioning

confidence: 99%

Section: Formation Mechanism Of Ldhs In Go-added Aas Pastesmentioning

confidence: 99%

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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“…Planar structure of graphene sheets provides much larger contact area since the top and bottom surfaces of the graphene sheet are in close contact with the host material. In addition, the superior aspect ratio (the ratio between length and width) is much higher than those of CNTs and conventional fibers [26]. Moreover, it was observed that in this case even very small amounts (0.05% or 0.1%) can be much more effective than application of standard CNTs [23,26].…”

Section: Sum Up; Future Directions Of Developmentmentioning

confidence: 85%

“…In addition, the superior aspect ratio (the ratio between length and width) is much higher than those of CNTs and conventional fibers [26]. Moreover, it was observed that in this case even very small amounts (0.05% or 0.1%) can be much more effective than application of standard CNTs [23,26]. However, the large surface forces of graphene oxide enforce researchers to find proper method of uniform dispersion of graphene in composite.…”

Section: Sum Up; Future Directions Of Developmentmentioning

confidence: 99%

Application of Nanomaterials in Production of Self-Sensing Concretes: Contemporary Developments and Prospects

Horszczaruk¹,

Sikora²,

Łukowski³

2016

Archives of Civil Engineering

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In the recent years structural health monitoring (SHM) has gathered spectacular attention in civil engineering applications. Application of such composites enable to improve the safety and performance of structures. Recent advances in nanotechnology have led to development of new family of sensors -self-sensing materials. These materials enable to create the so-called "smart concrete" exhibiting self-sensing ability. Application of selfsensing materials in cement-based materials enables to detect their own state of strain or stress reflected as a change in their electrical properties. The variation of strain or stress is associated with the variation in material's electrical characteristics, such as resistance or impedance. Therefore, it is possible to efficiently detect and localize crack formation and propagation in selected concrete element. This review is devoted to present contemporary developments in application of nanomaterials in self-sensing cement-based composites and future directions in the field of smart structures.

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“…Figure 1 illustrates the SEM images of hydrated cement paste at 28 days showing flowerlike crystals. The amount of crystals increases with increase in concentration of GO in cement matrix resulting in the formation of reinforced structure by reducing harmful pores [3,4]. Comparing the limits of nanomaterial composite i.e.…”

mentioning

confidence: 99%

Graphene oxide as nano reinforcing material in cement-based composites: A review

Devi¹,

Khan

Ambedkar³

2016

Proceedings of the International Conference on Nanotechnology for Better Living

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Mechanical properties and microstructure of a graphene oxide–cement composite

Cited by 722 publications

References 42 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

Application of Nanomaterials in Production of Self-Sensing Concretes: Contemporary Developments and Prospects

Graphene oxide as nano reinforcing material in cement-based composites: A review

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