The Dependence of the Aggregate Stability to Concrete of Modifying Additives Based on Halloysite Nanotubes in Water Environment on the Character of the Stabilizer

Lukutsova, N.P.; Kulesh, I.A.; Golovin, S.N.; Andrushin, S.A.

doi:10.4028/www.scientific.net/MSF.945.287

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The Dependence of the Aggregate Stability to Concrete of Modifying Additives Based on Halloysite Nanotubes in Water Environment on the Character of the Stabilizer
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HomeMaterials Science ForumFarEastСon - Materials and ConstructionThe Dependence of the Aggregate Stability to...

The Dependence of the Aggregate Stability to Concrete of Modifying Additives Based on Halloysite Nanotubes in Water Environment on the Character of the Stabilizer

Abstract:

The stabilizer nature effect on the aggregative stability of the modifying concrete additives based on halloysite nanotubes in the aquatic environment is shown. The chemical composition and morphology of halloysite nanotubes and their additives, obtained by ultrasonic dispersion in the aquatic environment of the surfactant, are studied. The influence on the processes of charge stabilization on the outer and inner surface of halloysite nanotubes is determined. The dependence of nanotube sizes and specific surface area on the stabilizer type, the time of ultrasonic dispersion, and additive storage is revealed. The stabilization mechanisms of aqueous dispersions of modifying additives based on halloysite nanotubes with anion-and cation-active substances are considered. It is established that the polynaphthalenesulfonate-based modifier S-3 has got the maximum efficiency as a stabilizer of aqueous dispersions of modifying concrete additives with halloysite nanotubes.

Info:

Periodical:

Materials Science Forum (Volume 945)

Main Theme:

FarEastСon - Materials and Construction

Edited by:

Dr. Denis Solovev

Pages:

287-292

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.945.287

Citation:

N.P. Lukutsova et al., "The Dependence of the Aggregate Stability to Concrete of Modifying Additives Based on Halloysite Nanotubes in Water Environment on the Character of the Stabilizer", Materials Science Forum, Vol. 945, pp. 287-292, 2019

Online since:

February 2019

Authors:

N.P. Lukutsova, I.A. Kulesh, S.N. Golovin, S.A. Andrushin

Keywords:

Aggregative Stability, Concrete Additives, Halloysite Nanotubes, Stabilizer, Ultrasonic Dispersion

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References

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Paper TitlePages

Model and Mechanism of Stabilization of Carbon Nanotubes with Placticizer on the Basis of Sulfonated Naphthalene Formaldehyde Resins

Authors: Svetlana V. Samchenko, Irina V. Kozlova, Olga V. Zemskova

Abstract: The entry presents studies of the effect of dispersion temperature on the deposition rate of CNTs in the presence of a plasticizer based on sulfonated naphthalene formaldehyde resins, on the dispersed composition of CNTs in aqueous and aqueous-polymer dispersion media and on the strength characteristics of samples with stabilized CNTs. It was established that the ultrasonic dispersion of aqueous suspensions of CNTs in the presence of a plasticizer based on sulfonated naphthalene formaldehyde resins at an ultrasonic vibration frequency of 44 kHz; dispersion temperature - 25 ± 2 °C; dispersion time - 10 - 30 minutes is capable of ensuring the stability of CNTs suspensions for 7 days or more. The mechanism of stabilization of aqueous suspension of CNTs by a plasticizer based on sulfonated naphthalene formaldehyde resins is presented. It has been established that the stabilization of CNTs is achieved by fixing the functional groups of the plasticizer on the surface of the nanoparticle, the nonpolar component of which ensures the formation of a high-viscosity interlayer between the CNTs particles and the dispersion medium, and the polar component is the formation of a double electric layer (DEL) that promotes the micellization of CNTs. As a result, the CNTs stabilized with sulfonaphthalene formaldehyde are evenly distributed in the volume of the cement system, causing the production of cement stone with enhanced performance properties.

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