Comparative effects of pristine and ball-milled graphene oxide on physico-chemical characteristics of cement mortar nanocomposites

Sharma, Snigdha; Kothiyal, N.C.

doi:10.1016/j.conbuildmat.2016.04.019

Cited by 111 publications

(45 citation statements)

References 55 publications

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“…[46,49] Since the formation of portlandite is a highly complex process extensively varying at the different stages of ongoing cement hydration, we have then performed XRD and FTIR analysis on samples cured for 28 d, in order to gain further insight onto the course of cement hydration reactions and their products. [51,52] Indeed, XRD results confirm visibly the decrease of Ca(OH) 2 amount in CI-G-0.05 samples as revealed previously by TGA. Figure 6b,c portrays the XRD patterns and FTIR spectra of selected CEM I samples (see also Figure S7 in the Supporting Information).…”

Section: Microstructure and Compositionsupporting

confidence: 86%

“…We have focused our attention on four representative samples made out of CEM I, namely, CI-R, CI-G-0.05, CI-GF-0.05, and CI-GO-0.05. [51] As observed for CI-G-0.05 sample, the peaks of alite and belite disappeared, indicating that EEG has promoted the hydration reactions, thus leading to a higher degree of hydration compared to plain cement mortar. Since the amount of sand was kept constant in all mixes, XRD patterns were scaled up by the intensity of major Quartz peak at position of 2Θ = 26.6°.…”

Section: Microstructure and Compositionmentioning

confidence: 58%

“…Alite with its fast reaction and high release of heat is responsible for early hydration, thus contributing mainly to early-age strength of concrete, whereas the reaction of belite being markedly slower releases less heat and contributes to long-term strength. [51] The peaks for Ca(OH) 2 appear at 18.0° and 34.1°. We have focused our attention on four representative samples made out of CEM I, namely, CI-R, CI-G-0.05, CI-GF-0.05, and CI-GO-0.05.…”

Section: Microstructure and Compositionmentioning

confidence: 98%

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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: Microstructure and Compositionsupporting

confidence: 86%

Section: Microstructure and Compositionmentioning

confidence: 58%

Section: Microstructure and Compositionmentioning

confidence: 98%

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High‐Performance Graphene‐Based Cementitious Composites

et al. 2019

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“…As a consequence of this 3D network, the microstructure of cement composites is visibly densified with a higher crystal growth and less prominent microcracks. Furthermore, also brittle crystals of ettringite are hardly observed [49]. The addition of GO remarkably refines the porosity, reducing the critical pore size and the volume of macropores [48,50].…”

Section: Improvement Of Mechanical Properties and Durabilitymentioning

confidence: 98%

Nanomaterials in Structural Engineering

Krystek¹,

Górski²

2018

New Uses of Micro and Nanomaterials

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Development of structural engineering, daring structures with record spans or heights, meets two serious obstacles-the limitations of traditionally used materials and the need of continuous monitoring of new structures subjected to complex loads, including those of dynamic nature. Considering the responsibility for the life of people and the budget of new structures, the need of constant monitoring is inevitable. This is why structural engineers seek for new solutions; among them, smart structures based on self-monitoring materials seem to be one of the most attractive proposals. It is still an unexplored area, but current research shows a high potential of the use of composites reinforced by carbon-based nanomaterials as self-sensing structural materials. Nanomaterials also influence other important features of structural materials, such as microstructure, mechanical, and transport-related properties. In this chapter, we present the state of art of the use of nanomaterials in structural engineering in various areas including mechanical and electrical properties as well as issues referring to durability.

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“…Until now, several processes for the modification of graphenic materials via MC have been developed. Most of them modify already existent CMG, such as the reduction of GO using under inert atmosphere [33] or the production of graphene oxide platelets from GO [34].…”

Section: Introductionmentioning

confidence: 99%

One Step Mechanosynthesis of Graphene Oxide Directly from Graphite

Ibarra¹,

Mendoza²,

Sanchez³

et al. 2019

Preprint

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Graphene oxide was synthesized by a one-step environmentally friendly mechanochemistry process directly from graphite and characterized by Raman, FT-IR and UV/vis spectroscopies, Atomic Force Microscopy, X-ray Diffraction, Scanning Electron Microscopy, Energy-Dispersive X-ray Spectroscopy and Thermogravimetric Analysis. Spectroscopic analysis shows that the functional groups and oxygen content of the synthesized material are comparable with those of graphene oxide synthesized by other previously reported methods (Hummers). Thermogravimetric analysis reveals thermal stability up to 400 °C.

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Comparative effects of pristine and ball-milled graphene oxide on physico-chemical characteristics of cement mortar nanocomposites

Cited by 111 publications

References 55 publications

High‐Performance Graphene‐Based Cementitious Composites

High‐Performance Graphene‐Based Cementitious Composites

Nanomaterials in Structural Engineering

One Step Mechanosynthesis of Graphene Oxide Directly from Graphite

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