Properties and Structure of Anhydrite Binder of Ergachinsky Deposit in the Presence of Phosphate Activators and Aleurolite

The results of studies of physical and mechanical properties and structure of the binder based on natural anhydrite in the presence of chemical and mineral additives are presented. The data were obtained by mechanical testing, differential scanning calorimetry, infrared spectral analysis, scanning electron microscopy and laser granulometry. For the first time, the efficiency of using phosphates of sodium and ammonium as activators of hardening of anhydrite binder is shown. Strength characteristics are increased from 2.5 to 4 times compared to the control composition, depending on the type of additive. The efficiency of using aleurolite – aluminosilicate rock of sedimentary origin as a mineral additive has been established. The use of an additive in an amount from 0 to 5% leads to an increase in strength to 40%, which is caused by the action of aleurolite particles as crystallization centers, on the surface of which crystallohydrates of gypsum dihydrate are formed. In this case, the additive is directly involved in the formation of the structure, which is confirmed by the results of infrared spectral analysis. The introduction of burnt aleurolite separately is impractical, but when combined introduction with lime strength characteristics are increased to 45% due to additional compaction by new hydration products formed by the interaction of metacaolin and lime.

Yu.V. TOKAREV, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
A.V. AGEEV, Bachelor (This email address is being protected from spambots. You need JavaScript enabled to view it.)
M.A. VOLKOV, Bachelor (This email address is being protected from spambots. You need JavaScript enabled to view it.)
N.V. KUZMINA, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)
G.I. YAKOVLEV, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Kalashnikov Izhevsk State Technical University (7, Studencheskaya Street, Izhevsk, 426069, Russian Federation)

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