Modification of low-quality clay-stock raw materials with nanosilica gel and its influence on the properties of ceramic shard

In connection with the prospects for growth in the volume of construction of individual residential buildings, the demand for facing ceramic bricks and large-format porous wall blocks is increasing. With a shortage of high-quality clay raw materials for the production of plastic molded ceramic bricks, it is recommended to switch to the production of semi-dry pressing products. An important task is to increase the strength of ceramic bricks, both carrying a load in the wall and performing a heat-insulating role. It is recommended to introduce an aqueous solution of nanosilica gel into the charge.
The main raw material was non-caking dusty loam of the Verkh-Tulinskoye deposit, containing more than 70% of dusty fractions (5-50 microns). As an additive, we used Lakesil-30 nanosilica gel produced by the Compass Scientific and Technical Center (Kazan). In the article, the authors used both standard research methods and modern methods of X-ray phase analysis to establish the material composition of a ceramic shard.
It has been established that, at optimal prescription and technological parameters, the introduction of Lakesil-30 gel with mixing water into the raw mixture increases the strength limit by 32.8% compared to the non-additive composition, without affecting the average density and water absorption of the ceramic shard. ... The quantitative phase composition of the shard has been studied.
It has been experimentally established that the strength of a ceramic shard is increased due to the use of an additive of Lakesil-30 nanosilica gel in an optimal dosage. To ensure the maximum strength of the ceramic shard, it is necessary that the processes of interaction of the aqueous solution of the additive with the clay component are completed during firing.

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