Modification of Fluorohydrite Binders with Ultrafine Diabase Powder

In this research, the influence of ultrafine diabase powder on the processes of fluoroanhydrite binder structure formation was studied. Assessed were the physical and mechanical characteristics of the modified fluoroanhydrite composition. It has been established that introduction of diabase powder in an amount of 7% into the technogenic anhydrite binder contributes to an increase in compressive strength of the modified compositions by 28% compared to the reference composition, which did not contain a modifying additive. An increase in strength was observed in the early stages of hardening. This can be explained by the creation of a dense crystalline structure in the developed composition due to the formation of calcium sulfoaluminate hydrates and amorphous calcium silicate hydrates of the tobermorite type, which fill the pores between calcium sulfate crystals. Here, in order to create conditions for the formation of a dense structure of the fluoroanhydrite matrix, it is important to provide an alkaline environment during the activation of fluoroanhydrite by adding sodium phosphate. The formation of new hydration products in the technogenic anhydrite composition in the early stages of hardening is confirmed by the methods of physical and chemical analysis, including X-ray phase analysis, X-ray microanalysis and scanning microscopy. The described technology makes it possible to obtain a composition with improved physical and mechanical properties, while solving problems of fluoroanhydrite utilization and preventing depletion of natural anhydrite binder reserves.

A.F. DIMUKHAMETOVA¹, Master (Graduate student) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
G.I. YAKOVLEV¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
G.N. PERVUSHIN¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
A.F. BURYANOV², Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
A.F. GORDINA¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
Z.S. SAIDOVA¹, Master (Graduate student) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Kalashnikov Izhevsk State Technical University (7, Studencheskaya Street, Izhevsk, 426000, Russian Federation)
² National Research Moscow State University of Civil Engineering (26, Yaroslavskoye Highway, Moscow, 129337 Russian Federation)

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