Abstract
Due to the shortage of high-quality clay raw materials, in many regions of Russia the urgent task of obtaining bricks, especially facing, from rocks with a low content of clay fractions. The problem can be solved by using the semi-dry pressing method. It is recommended to clarify the ceramic crock by introducing finely ground chalk in combination with a reinforcing additive wollastonite. The composition of the mixture was selected by the method of rational planning of the experiment. The introduction of additives in the optimal dosage made it possible to obtain: the cream color of the crock from red-baked clay raw materials with compressive strength of 49.5 MPa and water absorption of 10.5 wt.%. In this case, it is necessary to strictly control the dosage of chalk, as exceeding it above the optimum leads to a decrease in tensile strength and an increase in water absorption. Thus, based on raw materials with a clay particle content of only 6.8 vol. % it is possible to obtain a front ceramic brick with a clarified shard.
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