Role of Silica Fume in Formation of Cement Matrix Structure and Efflorescence in Vibrocompressed Products

This study investigates the causes and the mechanism of efflorescence on the surface of vibrocompressed products. It has been found that the main reason for the formation of efflorescence on the surface of vibrocompressed products is unbound calcium hydroxide in the composition of concrete. In order to reduce efflorescence dispersed silica fume is added to cement matrix in the amount of up to 8% from the weight of Portland cement. It is shown that silica fume densifies the structure of vibrocompressed products due to the binding of free calcium hydroxide with the formation of extra content of calcium hydrosilicates, thus, preventing efflorescence on the surface of molded products.

A.I. POLITAEVA¹, Bachelor (This email address is being protected from spambots. You need JavaScript enabled to view it.)
N.I. ELISEEVA², Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)
G.I. YAKOVLEV¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
G.N. PERVUSHIN¹, Doctor Sciences (Engineering)
JIRÍ HAVRÁNEK², CSc.
O.Yu. MIKHAILOVA¹, Master

¹ Kalashnikov Izhevsk State Technical University (7, Studencheskaya Street, Izhevsk, 426069, Russian Federation)
² OOO «Komplekt» (20, 50 let Pionerii Street, Izhevsk, 426033, Russian Federation)
³ STACHEMA CZ s.r.o. (Hasicská 1, 280 02, Kolín-Zibohlavy, Czech Republic)

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