Expanded Perlite Sand as an Effective Binder Additive

Substantiated and experimentally confirmed the possibility of using expanded perlite sand, pre-activated in a planetary mill, as a mineral additive to white cement to improve the technical and economic efficiency of small architectural forms based on it. It is shown that a slight grinding of perlite sand leads to its activation, which is expressed by an increase in the sorption capacity for the absorption of free CaO from solution (Zaporozhets method) and active Brönsted centers (indicator method). The addition of activated expanded sand provides a reduction in the setting time without making significant changes to the cement hydration processes in the early stages (up to 72 hours); an increase in the normal density of the dough; thickening of the system. The impact on the mobility of the cement paste is due to the peculiarities of the structure of the mineral additive: a developed angular surface with high dispersion and porosity of the particles. At the same time, the plasticization of dough based on cement with an active additive reduces water demand and makes it possible to obtain a cement stone with comparable strength at a reduced consumption of cement.

V.V. STROKOVA¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
V.V. NELUBOVA¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
N.O. KHMARA¹, Engineer Senior Lecturer (This email address is being protected from spambots. You need JavaScript enabled to view it.);
A.I. BUKOVSOVA², Candidate of Sciences (Engineering);
Yu.V. DENISOVA¹, Candidate of Sciences (Engineering)

¹ Belgorod State Technological University named after V.G. Shukhov (46, Kostyukova Street, Belgorod, 308012, Russian Federation)
² Starooskol Technological Institute named after A.A. Ugarova (42, Microdistrict named after Makarenko, Stary Osko, Belgorod Region,309516, Russian Federation)

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