Additive for Autoclave Aerated Concrete with Quick-Slaking Lime

The article deals with the use of powdered additives obtained from the production waste of silicate bricks and aerated concrete. The content of 75.5% quartz in the composition of silicate bricks makes it possible to use it in a ground form as an analog of ground sand with the addition of hydrosilicates in the production of silicate bricks and aerated concrete. The influence of the addition of ground bricks on the setting time and strength characteristics of the cement- sand mortar was studied. The issue of introducing an additive when grinding sand is considered, the effect of the additive on sand sludge and its rheological properties is established. The technological scheme of introducing the additive when preparing the sand sludge is given. A complex additive based on ground brick, plasticizer and gypsum stone was prepared with the solution of the issues of mobility, lime slaking time and strength. The efficiency of the additive for cement-sand mortat for different types of heat treatment is determined. The effectiveness of the additive at autoclave processing was established. The data of the study of a complex additive in the composition of a gas-concrete mixture are presented. It was found that the additive is effective for obtaining aerated concrete when using quick-slaking lime.

G.V. KUZNETSOVA, Engineer
N.N. MOROZOVA, Candidate of Sciences (Engineering)

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

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