Edge-oxidized graphene oxide (EOGO) in cement composites: Cement hydration and microstructure

An, Jinwoo; Nam, Boo Hyun; Alharbi, Yousef R.; Cho, Byoung Hooi; Khawaji, Mohammad

doi:10.1016/j.compositesb.2019.05.006

Cited by 58 publications

(26 citation statements)

References 19 publications

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“…Such noticeable enhancement of the mechanical properties (29% and 13% increase in compressive strength and flexural strength, respectively, compared to the control sample) of GO-modified cementitious nanocomposites have been previously assessed by several studies [62][63][64]. However, it is worth mentioning that most of the literature regarding these GO-modified nanocomposites focuses on a higher GO dosage that generally ranges between 0.02 and 1% by weight of cement [2,62,65,66]. In this respect, interestingly, the observed Rc trend is in complete agreement with the data reported in the review by Zhao et al [2]: most of the mortars containing GO in the range 0.01-0.2% by weight of cement had, at 28 days, increased compressive strength between 5 and 78% (average about 25%), the cited lower and upper values obtained for 0.01% GO and 0.1% GO, respectively.…”

Section: Fresh Go-modified Cementitious Admixtures: Rheology Flowability and Workabilitymentioning

confidence: 95%

Extra-Low Dosage Graphene Oxide Cementitious Nanocomposites: A Nano- to Macroscale Approach

et al. 2021

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The impact of extra-low dosage (0.01% by weight of cement) Graphene Oxide (GO) on the properties of fresh and hardened nanocomposites was assessed. The use of a minimum amount of 2-D nanofiller would minimize costs and sustainability issues, therefore encouraging the market uptake of nanoengineered cement-based materials. GO was characterized by X-ray Photoelectron Spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), Atomic Force Microscopy (AFM), X-ray Diffraction (XRD), and Raman spectroscopy. GO consisted of stacked sheets up to 600 nm × 800 nm wide and 2 nm thick, oxygen content 31 at%. The impact of GO on the fresh admixtures was evaluated by rheology, flowability, and workability measurements. GO-modified samples were characterized by density measurements, Scanning Electron Microscopy (SEM) analysis, and compression and bending tests. Permeability was investigated using the boiling-water saturation technique, salt ponding test, and Initial Surface Absorption Test (ISAT). At 28 days, GO-nanocomposite exhibited increased density (+14%), improved compressive and flexural strength (+29% and +13%, respectively), and decreased permeability compared to the control sample. The strengthening effect dominated over the adverse effects associated with the worsening of the fresh properties; reduced permeability was mainly attributed to the refining of the pore network induced by the presence of GO.

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Section: Fresh Go-modified Cementitious Admixtures: Rheology Flowability and Workabilitymentioning

confidence: 95%

Extra-Low Dosage Graphene Oxide Cementitious Nanocomposites: A Nano- to Macroscale Approach

et al. 2021

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“…The cement-based materials can be mixed with nanomaterials such as nano-silica (nano-SiO 2 ), nano-alumina (nano-Al 2 O 3 ), nano-ferric oxide (nano-Fe 2 O 3 ), nano-titanium oxide (nano-TiO 2 ), carbon nanotubes (CNTs), graphene and graphene oxide. In recent years, several researchers [29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49] have studied the incorporation of nanomaterials into cement-based materials. The mixture of cementitious composites and nanomaterials can increase the mechanical strength of the resulting concrete structures.…”

Section: Introductionmentioning

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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“…[ 34 ] have reported that also the addition of fly ash prevents the flocculation of GO, thus increasing the fluidity of GO‐cement mix. Moreover, the chemical functionalization of GO with polyether amines (Figure 2b), [ 49 ] coating of cement particles with GO in isopropanol suspension, [ 50 ] and using the edge‐oxidized GO produced by ball‐milling treatment [ 51 ] (Figure 2c) represent additional valuable, yet complex methods developed recently for the fabrication of GO‐cement composites.…”

Section: Fabrication Protocols For Graphene‐based Cementitious Compositesmentioning

confidence: 99%

Graphene‐Based Cementitious Composites: Toward Next‐Generation Construction Technologies

Krystek

Ciesielski

Samorı́

2021

Adv Funct Materials

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The search for technological solutions to the ever‐increasing demand for ultra‐high‐quality concrete with the simultaneous construction boom represents one of the greatest challenges concrete researchers are facing nowadays. In view of their unique properties, graphene and related materials, when utilized to form graphene‐based cementitious composites, appear to be powerful components to give a boost to today's concrete technology. In this review, the most enlightening recent advancements in the development of fabrication protocols for obtaining the homogenous dispersion of graphene and derivatives thereof within the cement matrix are showcased. The hydration process and basic properties of graphene‐based cementitious materials are also discussed. The integration of graphene‐family materials to concrete technology allows new functions to be imparted to cement composites toward the construction of smart and multifunctional buildings. Therefore, a specific focus is given to the electrical and piezoresistive behavior of graphene‐cement composites, and ultimately their great potential for structural health monitoring applications. The approaches proposed in this review can be also extended to other 2D materials offering the broadest arsenal of physical properties, which can therefore be integrated on‐demand in future smart structures and constructions.

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Edge-oxidized graphene oxide (EOGO) in cement composites: Cement hydration and microstructure

Cited by 58 publications

References 19 publications

Extra-Low Dosage Graphene Oxide Cementitious Nanocomposites: A Nano- to Macroscale Approach

Extra-Low Dosage Graphene Oxide Cementitious Nanocomposites: A Nano- to Macroscale Approach

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

Graphene‐Based Cementitious Composites: Toward Next‐Generation Construction Technologies

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