Building Materials and Products
DOI: http://www.dx.doi.org/10.24866/2227-6858/2020-3-13
Shvedova M., Slavcheva G., Artamonova O.
MARIA SHVEDOVA, Engineer, ORCID: https://orcid.org/0000-0002-6484-8719, ResearcheID: V-1901-2018, e-mail: marishwedowa@mail.ru
OLGA ARTAMONOVA, Doctor of Engineering Sciences, Professor, ORCID: https://orcid.org/0000-0001-9157-527X,
ResearcheID: X-8963-2018, ScopusID: 6603872707, e-mail: ol_artam@rambler.ru
GALINA SLAVCHEVA, Doctor of Engineering Sciences, Professor, ORCID: https://orcid.org/0000-0001-8800-2657,
ResearcheID: U-4421-2018, ScopusID: 57195684636, e-mail: gslavcheva@yandex.ru
Voronezh State Technical University
Voronezh, Russia
Effect of viscosity modifier additives
on the rheological behavior of 3D-printiable cement paste
Abstract: The results of experimental studies of the rheological characteristics of cement pastes as a matrix of 3D-printable mixtures are presented. The squeezing tests were used to evaluate the rheological behavior. To evaluate the plasticity, which characterizes the ability of 3D-printable mixtures to maintain aggregate stability during the extrusion process, the squeezing test with a constant deformation rate was used. To evaluate the form stability a squeezing test with a constant loading speed was used. As a result, the structural and plastic strength, plastic deformations of fresh cement pastes were estimated as criteria of their ability to maintain shape under compressive pressure during the printing process. Quantitate data on influence of types and dosages of inorganic viscosity modifiers with various chemical and mineralogical composition and size-particles on the plasticity and form stability of cement pastes was obtained. It was found that the most effective viscosity modifiers are fine-dispersed metakaolin and kaolin with an average size-particle of 5 μm. As a result of using the most effective viscosity modifiers, adjustment of viscous-plastic properties and aggregate stability of cement pastes can be made by modifying the properties of the dispersion liquid in the heterogeneous "cement–water" system. Reasonable proportions of these modifiers have been obtained, which ensures plasticity, maximum structural strength and minimum deformability of 3D-printable mixtures under load.
Keywords: 3D-printing, cement paste, viscosity modifier, rheological behavior, plasticity, form stability.
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