Evaluation of nano-graphene effect on mechanical behavior of clayey sand with microstructural and self-healing approach

Valizadeh, Mohammad; Choobbasti, Asskar Janalizadeh

doi:10.1080/01694243.2019.1676598

Cited by 15 publications

(10 citation statements)

References 14 publications

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“…Finally, (4) in the case of adding GO, GO was shown to be able to provide a flat platform for crystal formation and growth, because the large specific surface area of GO means it can absorb cations and form dense electron clouds. Therefore, GO has a significant nucleation effect; that is, particles may tend to concentrate on the surface of GO [ 19 , 31 ]. As a result, the particles are more likely to react with each other and form a dense, interwoven hydrated C-S(A)-H gel structure.…”

Section: Discussionmentioning

confidence: 99%

“…Nano material can fill the pores and provide nucleation sites of hydration products because of its very high specific surface area, surface charge and small pores. Therefore, even if these materials are added in small amounts, they can have significant impacts on the physical and chemical properties of soil [ 18 , 19 ]. Nano materials have increasing value in the application of clay solidification because of their excellent properties and suitable cost performance [ 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…SEM results showed that the pores of the soil matrix were reduced after GO was incorporated into cement–soil. In addition, Valizadeh and Zhou [ 19 , 33 ] found that adding a small amount of GO can significantly improve the physical and mechanical properties and microstructure of clay sand. The price of industrial GO is 2000 RMB per kg, and 0.57 kg of industrial GO is added per ton of grouting materials.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of the Effect of Graphene Oxide on the Properties and Microstructure of Clay-Cement Composite Grouting Materials

et al. 2022

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Reductions in bleeding rates and bulk shrinkage of grouting repair materials comprise the key to solving the leakage of earth–rock dams. In this paper, an anti-seepage grouting material for earth–rock dam was developed by introducing mineral admixtures and graphene oxide (GO) nano sheets into low-cost clay–cement grouting materials and by adding polycarboxylate superplasticizers (PCs) to improve slurry viscosity. The experimental results show that the shear stress and viscosity of the slurry increase with the increase in GO concentration, and the slurry has a certain thixotropy. GO can provide a platform to promote the formation of hydration products and fill the pores of clay particles due to its high specific surface area and low volume; in this paper, the microstructure of clay–cement–graphene oxide (CCGO) grouting materials were improved. Therefore, the bleeding rate, bulk shrinkage rate, setting time and unconfined compressive strength (UCS) of the sample were macroscopically improved. In particular, the bleeding rate and bulk shrinkage rate were shown to be 0% when the content of GO reached 1.08 g/kg. Thus, the grouting anti-seepage and reinforcement performance of CCGO grouting materials were improved.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of the Effect of Graphene Oxide on the Properties and Microstructure of Clay-Cement Composite Grouting Materials

et al. 2022

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“…Nowadays, many studies experimentally evaluate the effects of nanomaterials such as nano-graphene [20], nano-zycotherm [21], and nano-SiO 2 [22][23][24] on the selfhealing properties of asphalt. These studies have shown that the simultaneous addition of Forta fibers and nanozycotherm has a significant effect on the self-healing capability of asphalt [21].…”

Section: Background and Introductionmentioning

confidence: 99%

Atomistic-scale investigation of self-healing mechanism in Nano-silica modified asphalt through molecular dynamics simulation

Long

Tang

Guo

et al. 2022

J Infrastruct Preserv Resil

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As one of the most widely used nanomaterials in asphalt modification, the nano-silica (nano-SiO2) can significantly improve the self-healing behavior of asphalt eco-friendly. However, understanding of the self-healing mechanism of nano-SiO2 in asphalt is still limited. The objective of the study is to reveal the self-healing mechanism of nano-SiO2 in asphalt by using molecular dynamics (MD) simulations from the nanoscale. A 10 Å (Å) vacuum pad was added between the two same stable asphalt models to represent the micro-cracks inside the asphalt. The self-healing process of virgin asphalt, oxidation aging asphalt, and nano-SiO2 modified asphalt was studied using density evolution, relative concentration, diffusion coefficient, activation energy, and pre-exponential factor. The simulation results conclude that nano-SiO2 improves the self-healing ability of asphalt by increasing the diffusion rate of molecules with aromatic structures without alkyl side chains and molecules with structures with longer alkyl chains. The self-healing capability of asphalt may be principally determined by the diffusion of light components such as saturate, while nano-SiO2 only plays an inducing role. The research findings could provide insights to understand the self-healing mechanism of nano-SiO2 in asphalt for promoting the sustainability of bitumen pavements while increasing their durability. Graphical abstract

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“…The latter, reinforcement, involves the placement of randomly-distributed or systematically-engineered geosynthetics -such as fibers, geogrids, geocomposites and geocells -in the soil regime, thus interlocking the soil particles into a unitary mass of improved mechanical performance [6][7][8][9][10][11][12]. Chemical stabilization refers to the addition of chemical agents -mainly cementitious binders such as Portland cement and lime, and more recently polymers, resins and sulfonated oils -to the soil-water medium, thereby encouraging particle flocculation (and/or aggregation) and hence the development of a dense, uniform matrix coupled with enhanced mechanical properties [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A dimensional description of the unconfined compressive strength of artificially cemented fine-grained soils

Soltani

Deng

Taheri

et al. 2020

Journal of Adhesion Science and Technology

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show abstract

Evaluation of nano-graphene effect on mechanical behavior of clayey sand with microstructural and self-healing approach

Cited by 15 publications

References 14 publications

Investigation of the Effect of Graphene Oxide on the Properties and Microstructure of Clay-Cement Composite Grouting Materials

Investigation of the Effect of Graphene Oxide on the Properties and Microstructure of Clay-Cement Composite Grouting Materials

Atomistic-scale investigation of self-healing mechanism in Nano-silica modified asphalt through molecular dynamics simulation

A dimensional description of the unconfined compressive strength of artificially cemented fine-grained soils

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