Early-age interaction mechanism between the graphene oxide and cement hydrates

Lu, Zeyu; Li, Xiangyu; Hanif, Asad; Chen, Binmeng; Parthasarathy, P. R.; Yu, Jui-Chen; Li, Zongjin

doi:10.1016/j.conbuildmat.2017.06.176

Cited by 166 publications

(83 citation statements)

References 37 publications

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“…Nowadays, with its global consumption reaching 30 Gt per year, concrete is the most consumed synthetic material in the world, and the second only to water as the most consumed material on the global scale. [1,2] Despite the fact that concrete is presently the most common material applied for building structures, cement composites still possess several significant drawbacks.…”

Section: Introductionmentioning

confidence: 99%

“…[25][26][27][28][29][30][31][32][33][34] Graphene oxide is highly dispersible in water due to the oxygen functional groups attached on the basal plane and edges of GO sheets, [35] hence the main approach employed to fabricate cement-GO composites involves simply ultrasonication of GO dispersion in water, prior to mixing with cement. Therefore, cement composites incorporating graphene oxide (GO), i.e., the most easily processable graphene derivative, have been intensively investigated in recent years.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, cement composites incorporating graphene oxide (GO), i.e., the most easily processable graphene derivative, have been intensively investigated in recent years. [25,29,30] The authors attributed this phenomenon to the reduction of free water in cement mix due to the large surface area of GO nanosheets absorbing more water to wet their surface. [25][26][27][28] it has been reported that the addition of GO notably increases the yield stress and plastic viscosity of cement paste, thus affecting its fluidity and highly reducing its workability.…”

Section: Introductionmentioning

confidence: 99%

“…[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. As demonstrated in previous studies, the reinforcing mechanism of GO is attributed to the chemical reaction between GO nanosheets and cement hydration products.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High‐Performance Graphene‐Based Cementitious Composites

et al. 2019

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“…In addition, although the compressive strength is reduced at some extent due to the increased porosity, a great enhancement for tensile strength can be obtained by adding PVA into cement paste due to the three reasons, including irregular packing, formation of PVA films and microcracks in front of the main crack, which are discussed in the Effect of PVA on the Surface Wettability of Cement Paste section. It should be noted that the compressive strength is not a major problem for cementitious composites recently since there are many efficiency ways to improve it by three or four times, such as nanomaterials and nanotechnology . However, both of thermal and self‐cleaning properties of cement paste can be simultaneously enhanced by adding a small amount of PVA.…”

Section: Resultsmentioning

confidence: 99%

Thermal, mechanical, and surface properties of poly(vinyl alcohol) (PVA) polymer modified cementitious composites for sustainable development

Lu¹,

Hanif

et al. 2017

J of Applied Polymer Sci

Self Cite

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This study aimed to investigate the effect of poly(vinyl alcohol) (PVA) polymer on the thermal, mechanical, and surface properties on cementitious composites for sustainable development. Thermal properties of the PVA-modified cement paste, including thermal insulation and energy absorption ability, were first studied and correlated with the porosity and microstructures. The experimental results indicated that the thermal conductivity of cement paste can be greatly reduced by 42.9% with 2.0 wt % addition of PVA due to the more porous structure. However, at the same time, more thermal energy can be captured and concentrated at the surface of cement paste with the increasing amount of PVA, causing an increased thermal load and a negative effect on thermal insulating efficiency of cement paste. The contradictory effect of PVA on thermal properties of cement paste should be balanced before it is used as a foaming modifier to fabricate cementitious composites with thermal insulation. In addition, the contact angle measurement revealed that PVA can be used as an effective additive to improve the hydrophobicity of cement-based materials. Only 3.0% PVA can turn the surface nature from hydrophilicity to hydrophobicity for cement paste, which benefited to the development of self-cleaning cementitious composites. Finally, the mechanical properties of the PVA-modified cement paste, especially for the tensile strength that has been rarely reported, were investigated and correlated with its thermal and surface properties. Due to the compensative effects of irregular packing, formation of PVA films and microcracks, tensile strength of cement paste can be improved by 23.5% with a small scarifying of the compressive strength by adding 2.0% of PVA. In conclusion, the PVA-modified cement-based materials with lower thermal conductivity, hydrophobic surface nature and enhanced mechanical properties have a great potential to satisfy the high requirements in developing sustainable infrastructure.

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The Macro and Micro Effects of Graphene Oxide and Silica Fume on the Performance of Concrete under Standard Curing Conditions

Liu

et al. 2023

Adv Eng Mater

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Herein, the properties of concrete containing graphene oxide (GO) and silica fume (SF) are systematically investigated. The results show that the excellent properties of GO and SF have a significant improvement effect on the performance of concrete. Among them, the compressive, splitting tensile, and flexural strength of B‐1 group (GO, 0.01 wt% and SF, 2.5 wt%) are increased by 11.04%, 12.23%, 20.11% compared with the reference group after 3 days of curing. Meanwhile, the water penetration height of B‐1 group is decreased by 59.67% compared with reference group. The mass loss and relative dynamic modulus loss are 5.32% and 8.89% after 75 freeze‐thaw cycles, which are much lower than the reference group. Moreover, the micromodification mechanism of GO and SF on the concrete is investigated by using X‐ray diffraction analysis, scanning electron microscopy, and mercury intrusion porosimetry. The results show that the incorporation of GO and SF promotes the early hydration reaction of cement, improves the internal structure of the matrix, and enhances the compactness of the matrix.

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Early-age interaction mechanism between the graphene oxide and cement hydrates

Cited by 166 publications

References 37 publications

High‐Performance Graphene‐Based Cementitious Composites

High‐Performance Graphene‐Based Cementitious Composites

Thermal, mechanical, and surface properties of poly(vinyl alcohol) (PVA) polymer modified cementitious composites for sustainable development

The Macro and Micro Effects of Graphene Oxide and Silica Fume on the Performance of Concrete under Standard Curing Conditions

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