The Influence of Potassium Sulfate, as Activator, on the Hardening Process of Insoluble Calcium Sulfate


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Abstract

A fairly large number of works by both Russian and foreign researchers have been devoted to the development of building materials based on anhydrite binders. An astringent based on insoluble anhydrite refers to slow-hardening. This fact often deters manufacturers of building materials from using this binder. To date, there are many activators for the hardening of insoluble anhydrite. The efficiency of accelerators depends on a number of factors. But there is no unambiguous explanation for the action of additives used to obtain anhydrite materials with optimal properties, and this problem needs a comprehensive study. The use of anhydrite in the production of building products and materials is a promising direction in construction, since anhydrite binder is an interchangeable local material and can be used instead of cement or gypsum binders.

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About the authors

A. F. Buryanov

National Research Moscow State University of Civil Engineering

Author for correspondence.
Email: rga-service@mail.ru

Doctor of Sciences (Engineering)

Russian Federation, Moscow

N. A. Lukyanova

National Research Moscow State University of Civil Engineering

Email: galcevanadezda@mail.ru

Candidate of Sciences (Engineering)

Russian Federation, Moscow

E. N. Buldizhova

Moscow Institute of Psychoanalysis

Email: nusik-9o@yandex.ru

Candidate of Sciences (Engineering)

Russian Federation, Moscow

S. S. Rebrov

GIPSTECH LLC

Email: srebrov@list.ru

Engineer

Russian Federation, Latnaya working village, Voronezh region

References

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  2. Vtorov B., Fischer H.B. Influence of hardening activators on the properties of anhydrite binders. Materials of the Second International Scientific and Technical Seminar: Non-traditional technologies in construction. 2001, pp. 371–376. (In Russian).
  3. Klimenko V.G. The role of double salts based on Na+, K+, Ca2+, NH4+ sulfates in the technology of producing anhydrite binders. Vestnik BSTU named after V.G. Shukhova. 2017. No. 12, pp. 119–125. (In Russian).
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Supplementary files

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2. Fig. 1. Effect of K2SO4 content on setting time, min: синий столбик – 1% K2SO4; красный столбик – 1,5% K2SO4; зеленый столбик – 2% K2SO4

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3. Fig. 2. Effect of K2SO4 content compressive strength of, MPa: a – modified calcined anhydrite binder; b – modified synthetic anhydrite binder; c – modified natural anhydrite binder modified calcined anhydrite binder; синий столбик – 1% K2SO4; красный столбик – 1,5% K2SO4; зеленый столбик – 2% K2SO4

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4. Fig. 3. Microstructure of a hardened sample containing 2% K2SO4 (10 μm)

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