Reinforced impermeability of cementitious composites using graphene oxide-carbon nanotube hybrid under different water-to-cement ratios

Gao, Yuan; Jing, Hongwen; Zhou, Zefu; Chen, Weiqiang; Du, Mingrui; Du, Yue

doi:10.1016/j.conbuildmat.2019.06.186

Cited by 60 publications

(13 citation statements)

References 53 publications

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“…Obviously, compared with the blank group, the porosity of cement mortars containing GO and TiO 2 -RGO decreased by about 26% and 40%, respectively. This is consistent with the results of previous studies [ 40 , 41 ]. From the average pore size and porosity, it can be seen that the effect of adding TiO 2 -RGO is significantly better than GO.…”

Section: Resultssupporting

confidence: 94%

“…In addition, the MIP test results show that the sample doped with RGO-TiO2 has a smaller porosity than the sample doped with GO, which also explains its stronger water permeability resistance. It has been shown that graphene can optimize the pore structure distribution of cement mortar, thus improving the resistance of cement mortar to water penetration [41,46]. Figure 11 shows the distribution curve of chloride ion content of GO cement mortar samples with different content.…”

Section: Water Absorptionmentioning

confidence: 99%

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Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars

Zhang

Wang

et al. 2021

Materials

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Graphene’s outstanding properties make it a potential material for reinforced cementitious composites. However, its shortcomings, such as easy agglomeration and poor dispersion, severely restrict its application in cementitious materials. In this paper, a highly dispersible graphene (TiO2-RGO) with better dispersibility compared with graphene oxide (GO) is obtained through improvement of the graphene preparation method. In this study, both GO and TiO2-RGO can improve the pore size distribution of cement mortars. According to the results of the mercury intrusion porosity (MIP) test, the porosity of cement mortar mixed with GO and TiO2-RGO was reduced by 26% and 40%, respectively, relative to ordinary cement mortar specimens. However, the TiO2-RGO cement mortars showed better pore size distribution and porosity than GO cement mortars. Comparative tests on the strength and durability of ordinary cement mortars, GO cement mortars, and TiO2-RGO cement mortars were conducted, and it was found that with the same amount of TiO2-RGO and GO, the TiO2-RGO cement mortars have nearly twice the strength of GO cement mortars. In addition, it has far higher durability, such as impermeability and chloride ion penetration resistance, than GO cement mortars. These results indicate that TiO2-RGO prepared by titanium dioxide (TiO2) intercalation can better improve the strength and durability performance of cement mortars compared to GO.

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Section: Resultssupporting

confidence: 94%

Section: Water Absorptionmentioning

confidence: 99%

Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars

Zhang

Wang

et al. 2021

Materials

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“…Mohammed et al [85] investigated the effect of GO incorporation into ordinary and high-strength concrete at 800 ∘ C. The results showed that graphene oxide significantly improved the mechani-cal strength of the test piece, and proved that the thermal deformation of the sample was compatible with graphene oxide, and there was no early negative expansion. Gao et al [86] showed that graphene oxide/multi-walled car-bon nanotubes were distributed in a network in the slurry, which enhanced the pore structure of the slurry and im-proved the impermeability.…”

Section: Research Progress Of Durability Of Graphene Modified Cement-mentioning

confidence: 99%

Review on the research progress of cement-based and geopolymer materials modified by graphene and graphene oxide

Liu

Huang

et al. 2020

Nanotechnology Reviews

193

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AbstractIn recent years, with the higher requirements for the performance of cement-based materials and the call for energy conservation and environmental protection, a wave of research on new materials has set off, and various high-performance concrete and more environmentally friendly geopolymers have appeared in the public. With a view to solving the defects of energy consumption, environmental protection and low toughness of traditional cement-based materials. At the same time, nanomaterials have become a focus of current research. Therefore, the research on the properties of cement-based materials and geopolymers modified by graphene and its derivatives has aroused extensive interest of researchers. Graphene-based nanomaterials are one of them. Because of their large specific surface area, excellent physical properties have been favored by many researchers. This paper reviews the research progress of graphene-based nanomaterials in improving the properties of cement-based materials and geopolymer materials, and points out the main challenges and development prospects of such materials in the construction field in the future.

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“…Recent studies [126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147] have examined the performance of cement-based materials incorporating graphene family nanomaterials (GFN) such as graphene, graphene oxide (GO), reduced graphene oxide (rGO), and graphene nanosheets (GNS). These nanomaterials have extraordinary electrical, mechanical, chemical and thermal properties.…”

Section: Nanomaterials In Cement-based Materialsmentioning

confidence: 99%

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

et al. 2019

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Modern concrete infrastructure requires structural components with higher mechanical strength and greater durability. A solution is the addition of nanomaterials to cement-based materials, which can enhance their mechanical properties. Some such nanomaterials include nano-silica (nano-SiO2), nano-alumina (nano-Al2O3), nano-ferric oxide (nano-Fe2O3), nano-titanium oxide (nano-TiO2), carbon nanotubes (CNTs), graphene and graphene oxide. These nanomaterials can be added to cement with other reinforcement materials such as steel fibers, glass, rice hull powder and fly ash. Optimal dosages of these materials can improve the compressive, tensile and flexural strength of cement-based materials, as well as their water absorption and workability. The use of these nanomaterials can enhance the performance and life cycle of concrete infrastructures. This review presents recent researches about the main effects on performance of cement-based composites caused by the incorporation of nanomaterials. The nanomaterials could decrease the cement porosity, generating a denser interfacial transition zone. In addition, nanomaterials reinforced cement can allow the construction of high-strength concrete structures with greater durability, which will decrease the maintenance requirements or early replacement. Also, the incorporation of nano-TiO2 and CNTs in cementitious matrices can provide concrete structures with self-cleaning and self-sensing abilities. These advantages could help in the photocatalytic decomposition of pollutants and structural health monitoring of the concrete structures. The nanomaterials have a great potential for applications in smart infrastructure based on high-strength concrete structures.

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Reinforced impermeability of cementitious composites using graphene oxide-carbon nanotube hybrid under different water-to-cement ratios

Cited by 60 publications

References 53 publications

Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars

Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars

Review on the research progress of cement-based and geopolymer materials modified by graphene and graphene oxide

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

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