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First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address.Sergey A. Shakhov, Doctor of Technical Sciences, Associate Professor, Siberian State Transport University, Novosibirsk, Russian Federation Email This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Title of the articleRheological behavior of molding compounds from silica modified clay-ash mixture
Abstract.The development of the production of building ceramics is associated with the need to find effective technologies for replacing natural raw materials with industrial and household waste in the production of building ceramics. Compositions made from low-grade clay raw materials and ashes of various origins have recently been increasingly considered as a potential large-scale source of raw materials. However, the unsatisfactory rheological properties of molding compounds from clay-ash mixtures make it difficult to obtain high-quality building ceramics by plastic molding. The purpose of the work is to evaluate the possibility of controlling the rheological behavior of molding compounds from a clay-ash mixture by modifying them with silicon oxide hydrosol. The objectives of the research are to study the structural organization of ultrafine silica in an aqueous suspension, as well as to study the effect of silicon oxide hydrosol on the rheology of clay-ash molding compounds. Results. Through IR spectrometry, thermal and photocolometric analyses, optical and electron microscopy, it was established that silica sol contained in an aqueous suspension of sand after its processing in a ball mill plays the role of a surfactant in the clay-ash mixture, contributing to an increase in the thickness of the adsorption layer on the surface of ash and loam particles. Modeling of the combined influence of loam, ash and silica sol on the magnitude of the given deformations showed that SiO2 particles in a colloidal state provide a change in the ratio between free and bound water, which makes the molding mass more mobile and deformable. Conclusions. The significance of the results obtained for the construction industry is that in the processes of structure formation of clay-ash masses, silica sol contained in an aqueous suspension of sand should be considered as a nanostructured additive capable of effectively influencing the rheological behavior of molding masses and activating the processes of structure formation in the production of building ceramics.
Keywords.loam, ash, building ceramics, molding mass, rheology, silica sol, filtrate
For citations:Shakhov S.A. Rheological behavior of molding compounds from silica modified clay-ash mixture // News KSUAE, 2023, № 4(66), p. 255-266, DOI: 10.52409/20731523_2023_4_255, EDN: SILMPK

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