MODIFIED BINDER BASED ON SYNTHETIC ANHYDRITE FOR FILLING MIXES

DOI: 10.18503/2309-7434-2020-1(15)-9-14

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Authors:

A.F. BURYANOV, doctor of Technical Sciences, Moscow State University of Civil Engineering, Moscow, Russia

N.A. GALTSEVA, candidate of Technical Sciences, Moscow State University of Civil Engineering, Moscow, Russia

V.G. SOLOVYEV, candidate of Technical Sciences, Moscow State University of Civil Engineering, Moscow, Russia

N.E. BYLDIZHOVA, Engineer, Moscow State University of Civil Engineering, Moscow, Russia

Abstract: The article provides data on the study of synthetic anhydrite and its modifications for use in dry construction mixtures for laying mine workings. This synthetic anhydrite is obtained by reacting concentrated sulfuric acid and ground limestone.

In accordance with the technological and physico-mechanical requirements for the mixtures for laying the mine workings, an optimally suitable modified binder composition based on synthetic anhydrite was selected (Portland cement – 2,5%, potassium sulfate – 1%, percentage by weight of anhydrite). The relationship of plasticizer and structure formation of the obtained modified binder is determined. The optimum content of anhydrite and two-water gypsum in the hardened system was also established, which ensures maximum physical and mechanical properties.

Key words: synthetic anhydrite, filling mixtures, modified binder.

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