Anhydrite Binder Modified with a Complex Additive for Dry Building Mixtures

The complex additive as Portland cement, potassium sulfate and ferrous sulphate has a positive effect on the physical and technical properties of anhydrite binders. Mathematical models have been obtained that make it possible to design a material based on a fired modified anhydrite binder with specified properties in terms of setting time and strength characteristics. The complex activator affects the acceleration of the hydration of insoluble anhydrite and the processes occurring in this case. The optimal ratio of alkaline and sulfate hardening accelerators for activating various anhydrite binders has been established: for synthetic and natural anhydrite binders - an alkaline component of 3.5–5% and sulfate: 1.5–2% potassium sulfate, 0.6–1% iron sulfate; for roasting anhydrite binder – alkaline component 2–3.5% and sulfate: 1–1.5% potassium sulfate, 0.2–0.6% ferrous sulfate. Modification of the anhydrite system with the developed additive has a positive effect on the structure formation of hardening samples based on anhydrite binder. Compositions of dry building mixtures for floor screed based on modified anhydrite binder with specified performance properties have been developed. These dry mixes can be used in rooms for light, moderate and heavy loads, depending on the compressive strength.

A.F. BURYANOV¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
H.-B. FISHER², Doctor-Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.);
V.F. KOROVYAKOV¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
N.A. GAL'TSEVA¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
E.N. BULDYZHOVA³, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ National Research Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)
² Weimar University of Civil Engineering (11, Coudraystraβe, Weimar, 99421, Germany)
³ Moscow Institute of Psychoanalysis NIGHT VO (34, building 14, Kutuzovsky Avenue, Moscow, 121170, Russian Federation)

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