A Complex Lime-Siliceous Binder for Improving Raw Strength of Silicate Brick

Differences in the equipment of silicate brick factories built in 70s on the territory of the former USSR are considered. The present extension of the range of extruded products requires increasing their raw strength. There are three methods to reach this: increasing the lime consumption, additional charging of sands, and the use of a composite lime­siliceous binder. Possibilities to optimize the raw strength due to the correction of compositions of the lime­siliceous binder are considered. Research in the partial replacement of the sand for lime stone and loam with a clay content of 50% in the optimal composition of the lime­siliceous binder, I:P=1:1, is presented. The ultimate shear stress of lime stone, loam, and crushed sand has been determined separately and in the binder composition by the indirect method; their impact on raw and autoclaved strength has been also determined. It is established that the increase in the raw strength by 43% takes place when 50% of sand is replaced by loam, the replacement of 50% of sand with lime stone increase the raw strength by 2.3 times.

G.V. KUZNETSOVA, Engineer
D.A. BABUSHKINA, Student
G.Kh. GAYNUTDINOVA, Student

Kazan State University of Architecture and Engineering (1, Zelenaya Street, 420043, Kazan, Russian Federation)

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