Rheological Properties of Gypsum Cement Binders and Molding Mixtures Based on Them for 3D Additive Construction Technologies

The large-scale introduction of 3D technologies into the widespread practice of low-rise construction depends on their competitiveness compared to traditional technologies. There is a need for affordable materials that make it possible to obtain molding mixes for construction printing that best meet the requirements for them. Molding mixtures based on gypsum cement binders are effective for these purposes, which have a significant advantage in the ability to regulate the setting time within a wide range and the hardening rate compared to mixtures based on Portland cement. The results of experimental studies of rheological characteristics of gypsum cement binders and molding mixtures based on them, obtained using the method of rotational viscometry, are presented. The study of rheological features made it possible to establish that the introduction of a plasticizing and foaming additive eliminates the main rheological anomalies of the compositions, unifying the nature of their flow. With the introduction of a fine aggregate with partial polarization of the concrete mixture, the rheogram character remains close to linear. At the same time, the filler significantly increases the yield strength required to ensure mold stability, which is an important requirement for the effectiveness of gypsum cement molding mixtures for additive construction.

S.V. SHATALOVA, assistant (This email address is being protected from spambots. You need JavaScript enabled to view it.),
N.V. CHERNYSHEVA, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
M.Yu. ELISTRATKIN, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
M.Yu. DREBEZGOVA, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
S.V. MASALITINA, undergraduate (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Belgorod State Technological University named after V.G. Shukhov (46, Kostyukov Street, Belgorod, 308012, Russian Federation)

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