Gypsum-cement compositions with a mineral additive of fine-ground blast-furnace slag

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Abstract

The article studies the effect of the mineral additive of finely ground blast furnace slag on the properties of a composite gypsum binder. The research established the granulometric composition of the mineral additive and its particle size distribution; studied the morphology with a large number of structural defects (chips with pointed and chipped areas) with a developed rough surface of particles, contributing to an increase in the hydraulic activity of the mineral additive; determined the rational amount of the mineral additive of finely ground slag to ensure regulation of the CaO concentration in the gypsum-cement system within the recommended limits (according to TU 21-31-62–89); and established the presence of active adsorption centers on the surface of finely ground slag particles. The paper presents a comparison of the physical and mechanical properties of gypsum-cement concrete using a fine-ground slag mineral additive, Melflux 1641 F; Sika Visco Crete 200, and Sunbo PC-1021 superplasticizers, and citric acid as a setting retarder. The phase composition and microstructure of gypsum-cement stone were studied. Based on the developed gypsum-cement concrete, fine-grained concrete with increased water resistance (Kr=0,83) of strength class B30 was obtained by modifying the gypsum-cement hardening system with a set of multifunctional additives, including a fine-ground slag mineral additive, Melflux 1641 F superplasticizer, and citric acid as a setting retarder, as well as using quartz sand filler with an optimized particle size distribution.

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About the authors

N. V. Chernysheva

Peter the Great St. Petersburg Polytechnic University

Author for correspondence.
Email: chernysheva56@rambler.ru

Doctor of Sciences (Engineering)

Russian Federation, Letter B, 29, Politekhnicheskaya Street, St. Petersburg, 195251

I. S. Borisov

Peter the Great St. Petersburg Polytechnic University

Email: ivan-borisov-2013@bk.ru

Graduate Student

Russian Federation, Letter B, 29, Politekhnicheskaya Street, St. Petersburg, 195251

E. K. Sardarbekova

Kyrgyz-Russian Slavic University named after B.N. Yeltsin

Email: Elmira2507@mail.ru

Candidate of Sciences (Engineering)

Kyrgyzstan, 44, Kievskaya Street Bishkek, 720000

M. Y. Drebezgova

Peter the Great St. Petersburg Polytechnic University

Email: mdrebezgova@mail.ru

Candidate of Sciences (Engineering)

Russian Federation, Letter B, 29, Politekhnicheskaya Street, St. Petersburg, 195251

N. R. Trepkov

Peter the Great St. Petersburg Polytechnic University

Email: n.trepkov@gmail.com

Master’s Student

Russian Federation, Letter B, 29, Politekhnicheskaya Street, St. Petersburg, 195251

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Supplementary files

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2. Fig. 1. Distribution of particles of mineral additive of finely ground slag with a specific surface of 430 m2/kg

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3. Fig. 2. Surface morphology and particle size of finely ground slag

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4. Fig. 3. Diffraction pattern of finely ground blast furnace slag

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5. Fig. 4. Distribution of adsorption centers on the surface of particles of mineral additive of finely ground slag

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6. Fig. 5. Determination of the mobility of gypsum cement mixture (cone spread according to Suttard)

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7. Fig. 6. X-ray diffraction analysis of hydration products in samples of hardened KGV (28 days): a – with MD of finely ground slag; b – with MD of slag + Melflux 1641 F; c – with MD of slag + Sika Visco Crete 200; d – with MD of slag + Sunbo PC-1021

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8. Fig. 7. Microstructure of hardened СGV (28 days)

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9. Fig. 8. Optimized granulometric composition of quartz sand: 1 – sand; 2 – coarse sand; 3 – fine sand

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