Investigation of the Influence of the Sand Group on the Structure of Sand Mixtures in the Production of Pressed Products

The expansion of the nomenclature at existing production facilities inevitably raises the question of increasing the raw strength and competitiveness of silicate products. New productions are developing raw materials sources and there are questions about send: the possibility of using several types of sand in production. Properly selected sand mixture in the production of silicate pressed products contributes to good formability, sufficient density, strength and economy. The best granulometry of sand is the one in which the presence of a larger fraction in quantitative terms prevails over a small one. Studies of the compositions of sand mixtures are given. Mixtures of sands within one group, adjacent groups and with an interval through the group were considered. By mathematical modeling, calculations of the grain composition were carried out on the framework-forming grain residues of sizes 0.16 and 0.315 mm. The results obtained show that sand mixtures within one group are characterized by an increase in the size modulus and the absence of changes in the structure of the framework formation, which indicates the inexpediency of mixing them. Sand mixtures of sands of neighboring groups give a positive result with a ratio of at least 50/50. Sand mixtures with an interval through the group increase the ratio in favor of coarse sand from 70 to 90%. Based on the calculations, the density and raw strength of the pressed samples were determined on the basis of the sand ratios considered and the calculated results were confirmed.

G.V. KUZNETSOVA¹, Engineer, (This email address is being protected from spambots. You need JavaScript enabled to view it.);
N.N. USMANOV², Candidate of Sciences (Pedagogy), representative;
D.I. MIFTAHOVA¹, student,
N.E. KADYROVA¹, student

¹ Kazan State University of Architecture and Engineering (1, Zelenaya Street, 420043, Kazan, Russian Federation)
² HAIYUAN GROUP in the Russian Federation and the CIS (14, Jaudata Faizi St., 142025, Kazan, Russian Federation)

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