Rheological behaviour modelling of cement paste with nanotubes and plasticizer

Skripkiūnas, Gintautas; Karpova, Ekaterina; Daukšys, Mindaugas

doi:10.14382/epitoanyag-jsbcm.2019.32

Cited by 2 publications

(5 citation statements)

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“…The understanding of rheological behaviour of the plasticised cement paste with MWCNT can be valuable for further design of complex admixtures based on MWCNT and Pl. The present research is a continuation of research works [27][28][29], which generalise the research data on the rheological properties and water bleeding of cement pastes modified by MWCNT/CMC suspension in the presence of three different Pl, with application of the Herschel-Bulkley model for approximation of the experimental data; a possible explanation of the action mechanisms of MWCNT in the plasticised cement pastes is also proposed.…”

Section: Introductionmentioning

confidence: 77%

“…Rotational rheometer Rheotest RN 4.1 with coaxial cylinders was applied for the rheological test. The rheological test was performed at 5, 60, and 120 min after cement paste mixing according to the mode presented by [29]. The mix design of the cement pastes for the rheological test is presented in Tables 3 and 4.…”

Section: Testing Methodologymentioning

confidence: 99%

“…Ma et al [22] established an increase in yield stress and plastic viscosity of cement mortar modified by CNTs. Jiang et al [10] and Skripkiunas et al [27][28][29] observed an increase in yield stress and plastic viscosity of nanomodified cement paste as well. Opposite to these research works, Souza et al [23] and Paula et al [24] did not obtain any changes in rheology of the cement pastes and slurries prepared with CNTs synthesised on cement clinker.…”

Section: Introductionmentioning

confidence: 92%

“…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 In the current and previous research works [27][28][29], the rheological properties were evaluated for investigation of the plasticising effect and understanding of the working mechanism of MWCNT in the cement systems. The addition of MWCNT in the complex with Pl affects the steric effect in the cement paste due to the placement of fibre-shaped MWCNT with high length in the volume between cement particles (Figure 19c).…”

Section: Surface Area and Particles Distribution Density Effectmentioning

confidence: 99%

“…In addition to flowability tests, it is necessary to provide rheological investigations to obtain, more deeply, an understanding of the action mechanisms of nanoadditives in cement systems. Some attempts to study the rheology of nanomodified cement pastes by the use of rheometers and rheological models were made [10,[22][23][24][25][26][27][28][29]. Ma et al [22] established an increase in yield stress and plastic viscosity of cement mortar modified by CNTs.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 77%

Section: Testing Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Surface Area and Particles Distribution Density Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Air‐Entraining Effect on Rheological Properties of Cement‐Based Mixtures

Tolegenova,

Skripkiunas,

Rishko

et al. 2024

Advances in Materials Science and Engineering

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The rheological properties and stability of cement‐based materials determine the technological properties of concrete mixtures and significantly influence concrete properties. Polycarboxylate ether (PCE) and other plasticizing admixtures are widely used in construction practice to plasticize concrete mixtures. Experimental research on the rheological characteristics of cement mortar modified with PCE and air‐entraining admixtures (AIRs) was carried out with a rotation rheometer with coaxial cylinders and water bleeding tests. Herschel–Buckley or modified Bingham models were used to approximate experimental flow curves and assess rheological parameters such as yield stress, plastic viscosity, and shear thinning/thickening index. The rheological test was carried out at 5 and 90 min after mixing the cement mortar. The rheological test established that the modification of cement mortar by PCE in a dosage of 0.2% (in dry material) leads to a decrease in plastic viscosity of 25.0% with a reduction in water demand of 18% for the same workability. Modification of cement mortar by AIR in 0.3% dosage leads to a decrease in yield stress by 37.7% and a decrease in plastic viscosity by 35.4% compared to the control specimen without PCE. The combined modification by PCE and AIR admixtures shows a synergistic effect. It leads to a significant decrease in yield stress of cement mortar by 92.2% and a decrease in plastic viscosity to about 0 Pa·s. In addition, there is a significant coefficient of water bleeding reduction up to 0%, when additional water reduction was carried out in the mixture while maintaining the same workability. The cement mortar, with or without PCE and AIR, exhibited shear‐thinning characteristics for up to 90 min after mixing. The solid, liquid, and gas (air) phases’ influence yield stress and plastic viscosity in the analysis mixtures are presented in this paper. It has been established that a modified exponential Mooney dependency can be used to predict the yield stress and plastic viscosity of the modified cement mortar (both plasticized and air‐entrained).

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Rheological behaviour modelling of cement paste with nanotubes and plasticizer

Cited by 2 publications

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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

Air‐Entraining Effect on Rheological Properties of Cement‐Based Mixtures

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