Effect of reduced graphene oxide, alumina and silica nanoparticles on the deterioration characteristics of Portland cement paste exposed to acidic environment

Muthu, Murugan; Santhanam, Manu

doi:10.1016/j.cemconcomp.2018.05.005

Cited by 72 publications

(20 citation statements)

References 46 publications

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“…However, the addition of nanomaterials accelerates the hydration process and enhances the formation of C–S–H gel (as marked by yellow hexagons), which makes the microstructure denser, thereby increasing the strength and durability of the treated sample. However, non-uniform dispersion or excessive addition of nanomaterials (beyond an optimum dosage) leads to agglomeration and formation of weak bonds in the mortar sample [ 77 , 148 , 149 , 150 ]. Ling et al [ 13 ] observed that the inclusion of nano-silica in the mortar reduces the pores, concentrates the matrix, and enhances the strength of cementitious composites by improving the adhesion of the hydration products with the PVA fibers.…”

Section: Properties and Methodsmentioning

confidence: 99%

Comparative Overview of the Performance of Cementitious and Non-Cementitious Nanomaterials in Mortar at Normal and Elevated Temperatures

et al. 2021

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Nanotechnology has emerged as a field with promising applications in building materials. Nanotechnology-based mortars are examples of such building materials that have widespread applications in the construction industry. The main nanomaterials used in mortars include nano-silica, nano-magnesium oxide, nano-alumina, nano-titanium oxide, nano-zinc oxide, nano-clay, and nano-carbon. This review paper presents a summary of the properties and effects of these nanomaterials on cement mortar in terms of its fresh-state and hard-state properties. The fresh-state properties include the setting time, consistency, and workability, while the hard-state properties include mechanical properties such as compressive, flexural, tensile strengths, as well as the elasticity modulus, in addition to durability properties such as water absorption, shrinkage strain, strength loss due to freeze–thaw cycles, and chloride penetration, among others. Different nanomaterials cause different physical and chemical alterations within the microstructures of cement mortar. Therefore, the microstructural characterization and densification of mortar are discussed in detail at varying temperatures. In general, the involvement of nanomaterials in cement mortar influences the fresh-state properties, enhances the mechanical properties, and impacts the durability properties, while reducing the porosity present in the mortar matrix. Cementitious nanomaterials can create a pathway for the easy injection of binding materials into the internal microstructures of a hydration gel to impact the hydration process at different rates, whereas their non-cementitious counterparts can act as fillers. Furthermore, the research gaps and future outlook regarding the application of nanomaterials in mortar are discussed.

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Section: Properties and Methodsmentioning

confidence: 99%

Comparative Overview of the Performance of Cementitious and Non-Cementitious Nanomaterials in Mortar at Normal and Elevated Temperatures

et al. 2021

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“…The results of the research on the sulfate attack by GO-modified cementitious materials are basically consistent, and scholars have proven the effectiveness of GO to enhance the resistance of cementitious materials to the sulfate attack. GO refined the pore structure of the cementitious materials, and this is the reason for the improvement of sulfate attack resistance [78].…”

Section: Sulfate Attackmentioning

confidence: 97%

“…The improvement of GO-modified cementitious materials resistance to the sulfate attack has also attracted scholars' attention. In the study by Muthu and Santhanam [78], the GO-modified and nanoalumina-modified cement pastes were soaked in the acidic solution, and when compared with the unmodified sample, the porosity of the cement pastes was reduced by 46% and 51%, respectively. The study by Jiang et al [64] showed that under the condition of sulfate corrosion for 135 days, the compressive strength improvement rate of GO to cementitious materials is 12.3%.…”

Section: Sulfate Attackmentioning

confidence: 99%

Advances of graphene- and graphene oxide-modified cementitious materials

Wang

Wu³

et al. 2020

Nanotechnology Reviews

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AbstractEmerging nanomaterials provide an invaluable opportunity for the development of cementitious materials. Many scholars have explored the influence of graphene (GP) and graphene oxide (GO) on the performance of the cementitious materials. This article reviews the previous research on the effect of GP and GO on the properties of cementitious materials. Detailed review of the mechanical properties and durability of cementitious materials containing GP or GO nanofilms is presented, and the mechanism is discussed. The mechanical properties of GO-cementitious materials are significantly enhanced. The optimal improvement of GO-modified compressive, flexural, and tensile strengths is 77.3%, 78.3%, and 78.6%, respectively. The durability of GO- and GP-modified cementitious material is compared with the control group. The incorporation of GP or GO significantly improves the sulfate attack resistance, and the transport properties can be decreased, while the frost resistance of GO- and GP-modified cementitious materials needs further research. This literature review shows that the microstructure of GO- and GP-modified cementitious material is improved in three aspects: accelerating the cement hydration, refining the pore structure, and hindering the crack propagation.

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“…Many articles are devoted to studies of the effect of graphene oxide and graphene on concrete performance [4][5][6][7][8][9][10]. Graphene oxide (GO), which has been successfully used in cement composites as an admixture, can improve their mechanical and durability properties [4].…”

Section: Introductionmentioning

confidence: 99%

Improving functional and environmental performance of Portland cement-based materials by graphene nanostructures

et al. 2020

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Nanoparticles can accelerate cement hydration due to their high activity compacting microstructure, and consequently increase the strength. For the industrial production of concrete modified with nanoscale particles, it is necessary to develop an environmentally friendly and cheap technology for the industrial production of nanoparticles. The article presents the results of increasing the operational characteristics of concrete by adding graphene nanostructures obtained by liquid-phase shear exfoliation of graphite. This environmentally friendly technology requires energy costs, at least ten times less than technologies that use ultrasonic treatment of the suspension. Our industrial partner set a specific task: to find the minimum concentration of graphene structures in relation to cement, at which the compressive strength of cement-sand mix increases by 30%. It was experimentally established that at concentrations of graphene nanostructures with respect to cement not more than 0.02%, the compressive strength increases by at least 30%.

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Effect of reduced graphene oxide, alumina and silica nanoparticles on the deterioration characteristics of Portland cement paste exposed to acidic environment

Cited by 72 publications

References 46 publications

Comparative Overview of the Performance of Cementitious and Non-Cementitious Nanomaterials in Mortar at Normal and Elevated Temperatures

Comparative Overview of the Performance of Cementitious and Non-Cementitious Nanomaterials in Mortar at Normal and Elevated Temperatures

Advances of graphene- and graphene oxide-modified cementitious materials

Improving functional and environmental performance of Portland cement-based materials by graphene nanostructures

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