Assessment of Rheological and Piezoresistive Properties of Graphene based Cement Composites

Rehman, Sardar Kashif Ur; Ibrahim, Zainah; Jameel, Mohammed; Memon, Shazim Ali; Javed, Muhammad Faisal; Aslam, Muhammad Shahzad; Mehmood, Kashif; Nazar, Sohaib

doi:10.1186/s40069-018-0293-0

Cited by 48 publications

(35 citation statements)

References 40 publications

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“…Due to the van der Waals forces and electrostatic interactive forces, water molecules get entrapped inside the agglomerates/bundles of nanomaterials and reduce the quantity of free available water. A similar trend was observed in other nanomaterials as well Rehman et al [58] study using graphene and determine the rheological properties and found that entrapped water molecules significantly alter the rheological properties. This free available water is a dominating factor for determining the yield stress.…”

Section: Flexural Strengthsupporting

confidence: 84%

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Experimental Investigation of Hybrid Carbon Nanotubes and Graphite Nanoplatelets on Rheology, Shrinkage, Mechanical, and Microstructure of SCCM

et al. 2020

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Carbon nanotubes (CNTs) and graphite nanoplatelets (GNPs) belong to the family of graphite nanomaterials (GNMs) and are promising candidates for enhancing properties of cementitious matrix. However, the problem lies with their improper dispersion. In this paper graphite nanoplatelets are used with carbon nanotubes for dispersion facilitation of CNTs in cement mortar. The intended role is to use the GNPs particles for dispersion of CNTs and to investigate the synergistic effect of resulting nano-intruded mortar. Mechanical properties such as flexure and compressive strength have been studied along with volumetric stability, rheology, and workability. Varying dosages of CNTs to GNPs have been formulated and were analyzed. The hybrid use of CNTs-GNPs shows promise. Scanning electron microscopy reveals that hybrid CNTs/GNPs are well-suited for use in cement mortar composite performing a dual function.

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Section: Flexural Strengthsupporting

confidence: 84%

“…This is also observed by various other researchers. Rehman et al conducted a study on GNP and highlighted that GNPs blocked the growth of cracks at the nanoscale [58].…”

Section: Flexural Strengthmentioning

confidence: 99%

Experimental Investigation of Hybrid Carbon Nanotubes and Graphite Nanoplatelets on Rheology, Shrinkage, Mechanical, and Microstructure of SCCM

et al. 2020

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“…The reinforcing effect and dispersion of GNPs are both strongly affected by the dispersing agent concentration and the ultrasonic energy application [ 109 ]. Raise of GNPs concentration reduces the slump flow and increases the yield stress and plastic viscosity [ 117 , 118 ].…”

Section: Nanomaterials Typically Used In Cement-based Materialsmentioning

confidence: 99%

Nanomaterials in Cementitious Composites: An Update

et al. 2021

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This review is an update about the addition of nanomaterials in cementitious composites in order to improve their performance. The most common used nanomaterials for cementitious materials are carbon nanotubes, nanocellulose, nanographene, graphene oxide, nanosilica and nanoTiO2. All these nanomaterials can improve the physical, mechanical, thermal and electrical properties of cementitious composites, for example increase their compressive and tensile strength, accelerate hydration, decrease porosity and enhance fire resistance. Cement based materials have a very complex nanostructure consisting of hydration products, crystals, unhydrated cement particles and nanoporosity where traditional reinforcement, which is at the macro and micro scale, is not effective. Nanomaterials can reinforce the nanoscale, which wasn’t possible heretofore, enhancing the performance of the cementitious matrix.

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“…A superplasticizer generally improves the flow behavior of cement slurries and provides highly amorphous hydrates [159]. It is observed that increasing the amount of a superplasticizer admixture increases the cement gelation threshold [160], while decreasing the yield stress and viscosity and delaying the cement hydration process [161][162][163][164]. These effects are not that obvious when the admixture concentration is higher than 0.75% or when the shear rate is high (>128 rpm).…”

Section: Effect Of Additives/admixtures On the Viscositymentioning

confidence: 99%

A Review of Rheological Modeling of Cement Slurry in Oil Well Applications

et al. 2020

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The rheological behavior of cement slurries is important in trying to prevent and eliminate gas-migration related problems in oil well applications. In this paper, we review the constitutive modeling of cement slurries/pastes. Cement slurries, in general, behave as complex non-linear fluids with the possibility of exhibiting viscoelasticity, thixotropy, yield stress, shear-thinning effects, etc. The shear viscosity and the yield stress are two of the most important rheological characteristics of cement; these have been studied extensively and a review of these studies is provided in this paper. We discuss the importance of changing the concentration of cement particles, water-to-cement ratio, additives/admixtures, shear rate, temperature and pressure, mixing methods, and the thixotropic behavior of cement on the stress tensor. In the concluding remarks, we propose a new constitutive model for cement slurry, considering the basic non-Newtonian nature of the different models.

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Assessment of Rheological and Piezoresistive Properties of Graphene based Cement Composites

Cited by 48 publications

References 40 publications

Experimental Investigation of Hybrid Carbon Nanotubes and Graphite Nanoplatelets on Rheology, Shrinkage, Mechanical, and Microstructure of SCCM

Experimental Investigation of Hybrid Carbon Nanotubes and Graphite Nanoplatelets on Rheology, Shrinkage, Mechanical, and Microstructure of SCCM

Nanomaterials in Cementitious Composites: An Update

A Review of Rheological Modeling of Cement Slurry in Oil Well Applications

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