Microstructure and mechanical performance of graphene reinforced cementitious composites

Li, Gen; Yuan, Jiangyan; Zhang, Y.H.; Zhang, Nian Yan; Liew, K.M.

doi:10.1016/j.compositesa.2018.08.026

Cited by 71 publications

(17 citation statements)

References 34 publications

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“…When the HO-G content was further increased to exceed 0.03 wt %, the compressive strength degraded monotonously and consistently. An excessive dosage of HO-G resulted in an adverse impact on the reinforcement of mechanical properties due to the overlapping and aggregation of HO-G together, which was consistent with other reports . As shown in Table , the flexural strength of the mortar specimens increased with increasing the content of HO-G from 0.005 to 0.03 wt % and then decreased with the further increase of the HO-G dosage.…”

Section: Resultssupporting

confidence: 89%

“…An excessive dosage of HO-G resulted in an adverse impact on the reinforcement of mechanical properties due to the overlapping and aggregation of HO-G together, which was consistent with other reports. 49 As shown in Table 1, the flexural strength of the mortar specimens increased with increasing the content of HO-G from 0.005 to 0.03 wt % and then decreased with the further increase of the HO-G dosage. When 0.03 wt % HO-G was added into the mortar, the flexural strength of C 0.03 achieved a maximum value with a growth rate of 7.89% at day 28.…”

Section: Dispersion Stability Of Ho-g In Saturated Ch Solutionmentioning

confidence: 86%

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Hydroxylated Graphene: A Promising Reinforcing Nanofiller for Nanoengineered Cement Composites

et al. 2021

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A very low dosage of graphene oxide (GO) can enhance the mechanical durability of cement composites, but the reinforcing enhancement is highly dependent on the uniform dispersion of graphene in the matrix. Carboxylic groups at GO nanosheets have a decisive effect on GO aggregation in an alkaline cement solution because they have a strong complexation ability with aqueous Ca2+ released by cement hydration and subsequently crosslinks the adjacent graphene sheets, causing the immediate coagulation of GO. The available methods of homogeneously dispersing GO in a cement slurry cannot completely eliminate this carboxylic-crosslinking-induced GO coagulation. In this study, many hydroxyl groups were introduced onto the edge and planar nanosheets to prepare water-soluble hydroxylated graphene (HO-G) by facile ball milling. The structure of HO-G was thoroughly characterized in detail, and its dispersion behavior in pure water and Ca(OH)2 was extensively investigated. These results showed that the prepared HO-G exhibited good hydrophilicity and excellent colloidal dispersion ability against high pH and Ca2+ ions compared to GO. The effect of HO-G on the workability, mechanical strength, and chloride penetrability of a cement mortar was further studied. At a content of 0.03% by cement mass, HO-G provided 28.62 and 21.19% enhancements of compressive strength and 3.85 and 7.89% enhancements of flexural strength at 3 and 28 days, respectively, while the non-steady-state migration coefficient decreased by 31.51% compared to the reference mortar. Compared to GO, a lower dosage of HO-G exhibited a similar reinforcing effect to cement composites with little adverse impact on the fluidity of the fresh cement slurry. Moreover, the addition of HO-G could refine the pore structure, accelerate the hydration process of cement to some degree, and generate more hydration products so that the structure of the cement mortar was densified. Considering its environmentally friendly preparation, HO-G, as a promising reinforcing nanofiller, could provide a new solution to develop nanoengineered cement composites.

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Section: Resultssupporting

confidence: 89%

Section: Dispersion Stability Of Ho-g In Saturated Ch Solutionmentioning

confidence: 86%

Hydroxylated Graphene: A Promising Reinforcing Nanofiller for Nanoengineered Cement Composites

et al. 2021

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“…These nanomaterials have extraordinary electrical, mechanical, chemical and thermal properties. Thus, GFN reinforced cement-based materials can improve their structural strength and durability, as well as allow self-cleaning surfaces and self-sensing abilities [148,149,150,151,152,153,154,155,156,157,158].…”

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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“…O FTIR [32] e o DRX [1,8,32] aparecem em alguns artigos como método de análise dos compósitos de cimento. LI G. et al [33] por meio de análises em DRX afirmam ainda que a presença de OG pode promover formação de etringita. YANG et al [32] que além da realização das análises de FTIR e DRX nas pastas de cimento, realizaram análise química XPS, TGA e MEV e apontam que a presença de OG não alterou a microestrutura do C-S-H e as melhorias nas propriedades mecânicas vieram principalmente da aceleração do grau de hidratação e das reações químicas.…”

Section: Microestruturaunclassified

Revisão teórica sobre o potencial da adição do óxido de grafeno em materiais cimentícios

et al. 2021

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RESUMO O óxido de grafeno tem sido apontado como um material de reforço para compósitos de cimento. Além de ser um material com boa dispersão em água, ele apresenta elevado módulo de elasticidade, elevada resistência à tração, elevada superfície específica e alta condutividade térmica e elétrica. Visando aprofundar o conhecimento acerca do uso do óxido de grafeno em compósitos de cimento, o presente trabalho apresenta uma ampla revisão bibliográfica sobre os efeitos da adição do óxido de grafeno em compósitos de cimento Portland. A metodologia empregada para a seleção dos artigos acadêmicos foi o ProKnow-C, (Knowledge Development Process – Constructivist), ferramenta de revisão literária que permite a evidenciação do estágio atual do conhecimento acadêmico relacionado ao tema de estudo. Por meio desta metodologia de busca e seleção de artigos, foi possível selecionar, a partir de uma amostra bruta de 1354 artigos, os 47 artigos mais relevantes que apresentam as alterações nas propriedades mecânicas, no comportamento reológico e na microestrutura de compósitos de cimento com adição de óxido de grafeno, bem como técnicas de dispersão utilizadas. Dessa forma, as principais conclusões, as lacunas atuais de pesquisa e as oportunidades de estudo foram sumarizadas, constituindo uma base de referência para orientar trabalhos futuros envolvendo o uso de óxido de grafeno para a preparação de compósitos de cimento.

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Microstructure and mechanical performance of graphene reinforced cementitious composites

Cited by 71 publications

References 34 publications

Hydroxylated Graphene: A Promising Reinforcing Nanofiller for Nanoengineered Cement Composites

Hydroxylated Graphene: A Promising Reinforcing Nanofiller for Nanoengineered Cement Composites

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

Revisão teórica sobre o potencial da adição do óxido de grafeno em materiais cimentícios

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