Synergies on rheology and structural build-up of fresh cement pastes with nanoclays, nanosilica and viscosity modifying admixtures

Varela, Hugo; Barluenga, Gonzalo; Palomar, Irene; Sepulcre, Alberto

doi:10.1016/j.conbuildmat.2021.125097

Cited by 14 publications

(2 citation statements)

References 41 publications

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“…In the construction industry, various ultra-fine additives have been utilized to improve the strength and longevity of cementitious components (Liu et al 2000, Kumar et al 2018. It has also been discovered that chemical admixtures, such as retarders (Guoju and Zhang 2020), viscosity-modifying agents (Bouras et al 2012, Fares et al 2022, accelerators (Leinitz et al 2019), and water-reducing agents (Varela et al 2021), improve the rheology of cement paste. Table S1 depicts the summary of previous research works on cement/mortar involving Rheological parameters.…”

Section: Introductionmentioning

confidence: 99%

Effect of cement kiln dust and lignosulfonate on cement paste: a rheology and hydration kinetics study

Masi

2023

Mater. Res. Express

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This research provides a comprehensive analysis of the influence of cement kiln dust (CKD) and lignosulfonate (LS) on the rheology and hydration kinetics of cement paste. The interaction effect, dispersion potential, and adsorption kinetics of LS on the cement/CKD paste were obtained using UV spectroscopy and zeta potential measurements. The results indicate that the addition of LS reduces the yield stress and plastic viscosity through the dispersion effect of LS, which alters the adhesion of the particles and improves the rheology of the CKD/cement paste. The competing adsorption of LS by the cement and CKD particles increased the flowability of the cement paste and a maximum was obtained due to the stable combined action of two different mechanisms of steric hindrance and electrostatic repulsion by LS. The X-ray Diffraction analysis performed to evaluate the hydration response of cement with LS and CKD showed greater conversion potentials of SiO2 to stable CSH.

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Section: Introductionmentioning

confidence: 99%

Effect of cement kiln dust and lignosulfonate on cement paste: a rheology and hydration kinetics study

Masi

2023

Mater. Res. Express

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“…Fami 27 et al used the small amplitude oscillation method with a logarithmic amplitude of 0.001% to 100% and a frequency of 1 Hz to recover the cement-fly ash mortar after pre-shearing, and carried out a viscoelasticity test. Besides, Varela 28 and Douba 29 et al both evaluated the effect of different dosages of nano-components and polymeric admixtures on the rheological properties of cement pastes by using dynamic and static shear, and small oscillation testing regimes, but with different parameters set.…”

Section: Introductionmentioning

confidence: 99%

Effect of pre–shearing regimes on rheological parameters of cement paste

Feng,

Li,

et al. 2023

J Am Ceram Soc.

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In rheological testing, different test regimes can result in large differences in the rheological curves, and the pre‐shear procedure is one of the most important parts of the test. In order to investigate the effect of the pre‐shear regime on the rheological properties of cement pastes, an Anton Paar 102 rotary rheometer was used for the test. Two different pre‐shear regimes (RF and CP pre‐shear), three different pre‐shear duration times (50 s, 100 s, 150 s), and four different pre‐shear rates (25 s−1, 50 s−1, 100 s−1) are carried out for the test. The results showed that with the increase of pre‐shear duration or rate, the four rheological parameters (plastic viscosity, yield stress, rheological index, and thixotropy) of the pastes decrease in different degrees. RF pre‐shear was more influenced by shear time, while CP pre‐shear was influenced by shear time and rate. The pre‐shear regimes led to different changes in the flocculation structure of the cement paste, which had a great influence on rheological parameters ultimately. Based on the improved Krieger‐Dougherty model, the effective solid volume fraction of cement paste was calculated. Analysis shows that the phenomenon of “deflocculation” and “re‐flocculation” occurs when the cement paste is subjected to shear action, thus, the pre‐shear regimes destroy the structure of the pastes. With the increase of pre‐shear duration or rate, the effective volume fraction decreased, which indicated that the initial flocculation structure was broken. The greater the damage degree of pre‐shear, the slower the establishment rate of the internal structure of the pastes in dynamic shear, resulting in lower rheological parameters.

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Nano-modified Materials for New Construction Technologies: Self-Compacting and 3D Printing

Varela,

Barluenga,

Perrot

2023

Architecture Inspired by Nature

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Synergies on rheology and structural build-up of fresh cement pastes with nanoclays, nanosilica and viscosity modifying admixtures

Cited by 14 publications

References 41 publications

Effect of cement kiln dust and lignosulfonate on cement paste: a rheology and hydration kinetics study

Effect of cement kiln dust and lignosulfonate on cement paste: a rheology and hydration kinetics study

Effect of pre–shearing regimes on rheological parameters of cement paste

Nano-modified Materials for New Construction Technologies: Self-Compacting and 3D Printing

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