Gypsum Binder of Low Water Demand: Production and Properties

Reducing the water demand of gypsum binders remains an actual scientific and practical task. The high water demand of building gypsum is due to the porous structure of its crystal block. Reduction of water demand in the production of gypsum materials and products is achieved by the use of high-strength gypsum binder, technological operation of artificial aging or the use of water-reducing additives. One of the solutions to the problem of reducing the water demand of construction gypsum is the production of gypsum binder of low water demand. A technology for manufacturing a gypsum binder of low water demand in a centrifugal impact mill using a liquid modifier based on polycarboxylate ether has been developed. This machine combines the processes of grinding, mechanical activation and chemical modification. As a result of mechanochemical treatment, the nanostructure of the chemical modifier is formed on the surface of the binder particles. The binder obtained has a water demand of 29%, compressive strength of 10 MPa, bending strength of 3.5 MPa (after 2 hours of hardening). High strength of gypsum stone is achieved by changing the morphology of particles of gypsum dehydrate and forming a large number of interparticle contacts. Construction and technical properties of the gypsum binder of low water demand corresponds to high-strength gypsum binders.

M.S. GARKAVI¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
A.V. ARTAMONOV¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
E.V. KOLODEZHNAYA², Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
A.P. NEFEDEV³, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.),
E.A. KHUDOVEKOVA³, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Ural-Omega, PJSC (89, Building 7, Lenina Avenue, Magnitogorsk, 455037, Russian Federation)
² Institute of Comprehensive Exploitation of Mineral Resources Russian Academy of Sciences (4, Kryukovskiy dead end, Moscow, 111020, Russian Federation)
³ Synergo, LLC (15, Chapaeva street, Magnitogorsk, 455000, Russian Federation)

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