The effect of multi-walled carbon nanotubes on the rheological properties and hydration process of cement pastes

Leonavičius, Dainius; Pundienė, Ina; Girskas, Giedrius; Pranckevičienė, Jolanta; Kligys, Modestas; Kairytė, Agnė

doi:10.1016/j.conbuildmat.2018.09.082

Cited by 30 publications

(13 citation statements)

References 40 publications

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“…The ability of MWCNT in definite dosages to reduce the free water content in cement systems decreases the plasticising efficiency of Pl and, as a consequence, the flowability of cement paste. The rheological tests of the present and previous research works [25,27,59] revealed that MWCNT addition with the achievement of specific dosages increases the values of the yield stress and plastic viscosity of cement-based mixtures.…”

Section: Surface Area and Particles Distribution Density Effectsupporting

confidence: 54%

Rheological Properties and Flow Behaviour of Cement-Based Materials Modified by Carbon Nanotubes and Plasticising Admixtures

Skripkiūnas

Karpova

Bendoraitienė

et al. 2020

Fluids

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In this study, the rheological properties of cement paste modified by a suspension containing both multi-walled carbon nanotubes (MWCNT) and carboxymethyl cellulose (CMC) (MWCNT/CMC suspension) with different types of plasticising admixtures (Pl), such as lignosulphonate (LS), sulfonated naphthalene formaldehyde condensate (NF), and polycarboxylate ether (PCE) were evaluated. The increase in yield stress and plastic viscosity up to 20% was established in the case of the modification of cement-based mixtures by MWCNT in the dosage up to 0.24% by weight of cement (bwoc) without Pl and with LS and NF. The complex modification of cement paste by MWCNT and PCE increases the yield stress and plastic viscosity from the MWCNT dosage of 0.06% and 0.015% bwoc, respectively. The yield stress and plastic viscosity of cement paste with PCE enhanced by 265% and 107%, respectively, in a MWCNT dosage of 0.12% bwoc. MWCNT do not have a significant influence on the flow behaviour index of cement paste; however, in the case of usage of PCE, the shear thickening effect decreased from a MWCNT dosage of 0.03% bwoc. The significant reduction in the volume coefficient of water bleeding by 99, 100, and 83% was obtained with LS, NF, and PCE, respectively, with an increase in MWCNT dosage up to 0.24% bwoc.

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Section: Surface Area and Particles Distribution Density Effectsupporting

confidence: 54%

Rheological Properties and Flow Behaviour of Cement-Based Materials Modified by Carbon Nanotubes and Plasticising Admixtures

Skripkiūnas

Karpova

Bendoraitienė

et al. 2020

Fluids

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“…The reduction in water absorption can be attributed to the association of CNTs to the lightweight concrete that helps decrease the micropores and produce the denser concrete structure. Besides, a comparatively higher water abortion rate was observed than Leonavičius et al [45] and Kordkheili et al [46] due to the uses of expanded glass aggregates in the study. Expanded glass aggregates are porous in structure and contain several pores that can absorb water up to 20 to 25% which attributes the increases in water absorption.…”

Section: Strength Of Cnt-lwacmentioning

confidence: 57%

“…Water absorption rate of control sample was measured 14.98%, 22.74%, 32.33% and 34.33% at 15 min, 1 hr, 24 hr and 48 hr that decreased to 13.20%, 16.31%, 28.86% and 30.42% respectively. Madhavi, T. Ch, et al [44], and Leonavičius, Dainius, et al [45] reported that at a lower concentration of CNTs total pore volume reduced by lling the voids and leads to a reduction in water absorption. Moreover, a high concentration of CNTs in concrete leads to a more porous structure and reduces the mechanical performance of concrete [45,46].…”

Section: Strength Of Cnt-lwacmentioning

confidence: 99%

Effects of Carbon Nanotubes on the Properties of Lightweight Concrete Prepared With Expanded Glass and Hydrophobic Silica Aerogel

Adhikary¹,

Rudžionis²,

Tučkutė³

2020

Preprint

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This study aimed to study the effect of carbon nanotubes on the properties of expanded glass and silica aerogel based lightweight aggregate concrete. CNTs were dispersed in the polycarboxylate superplasticizer added water by ultrasonication energy for 3 minutes. Combinations of expanded glass (55%) and hydrophobic silica aerogel particles (45%) were used as lightweight aggregates. Study results show that the incorporation of MWCNTs significantly influences the mechanical and microstructural performance of aerogel based lightweight concrete. Almost 41% improvement in compressive strength was gained by the addition of carbon nanotubes. SEM image of lightweight concrete shows CNTs were almost dispersed homogeneously within the concrete structure. SEM image of the composite also shows the presence of the C-S-H structure surrounding the CNTs, that confirms the cites of nanotubes for higher growth of C-S-H. Besides, agglomeration of CNTs and the presence of Ettringites observed in the transition zone between the silica aerogel and cementitious materials. Moreover, flowability, water absorption, microscopy, XRD, and semi-adiabatic calorimetry results were analyzed in this study.

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“…Besides, the reduction in the heat produced was noticed for all samples containing CNTs with respect to the control sample, and the head reduction rate grew by increasing the quantity of CNTs. The reduction in generated heat can be attributed to the agglomeration of CNTs around the cement grains, hindering C3A hydration Similarly, Leonavičius et al [24] show the opposite phenomenon and argue that CNTs effectively extend the setting time of cementitious composites. In cement paste samples incorporating 0.005% and 0.5% CNTs, the initial setting time is prolonged by 25.1% and 130%, respectively, while the final setting time is extended by 29.5% and 110%, respectively.…”

Section: The Effect Of Cnts On Cementitious Composite Hydrationmentioning

confidence: 99%

“…Some authors report a slight increase in the flowability of modified concrete where a proper CNT dispersion technique and mixing process was used [10,[16][17][18]. Some studies were carried out to investigate the effects of CNTs on the hydration of cement composites [19][20][21][22][23][24] and research results show that CNTs effectively influence the hydration of cementitious composites. CNTs most often accelerate the hydration process and add to the development of higher heat during hydration.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Carbon Nanotubes on the Flowability, Mechanical, Microstructural and Durability Properties of Cementitious Composite: An Overview

2020

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Excellent mechanical properties and chemical stability make carbon nanotubes (CNTs) some of the most promising nanomaterials that can be used in cementitious composites to improve their performance. However, the difficulty of CNTs’ dispersion within the cementitious structure still exists and thus prevents the homogeneous distribution of CNTs. The homogeneous distribution of CNTs within a composite structure plays an essential role that can have a positive effect on the mechanical performance of CNT-cement composites. This paper introduces the methods for the production of CNTs and provides useful information about the influence of CNTs on the flowability, mechanical performance, microstructural changes and hydration of cement composites. The influences of water-cement ratio, used surfactants and various doses of CNTs on the properties of cementitious composites were also studied.

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The effect of multi-walled carbon nanotubes on the rheological properties and hydration process of cement pastes

Cited by 30 publications

References 40 publications

Rheological Properties and Flow Behaviour of Cement-Based Materials Modified by Carbon Nanotubes and Plasticising Admixtures

Rheological Properties and Flow Behaviour of Cement-Based Materials Modified by Carbon Nanotubes and Plasticising Admixtures

Effects of Carbon Nanotubes on the Properties of Lightweight Concrete Prepared With Expanded Glass and Hydrophobic Silica Aerogel

The Effect of Carbon Nanotubes on the Flowability, Mechanical, Microstructural and Durability Properties of Cementitious Composite: An Overview

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