The effect of two deflocculants that effectively reduce the viscosity of the cement paste has been investigated. sodium tripolyphosphate (PF) and Castament FS 20 (C1) based on polycarboxylate ether and their mixture on the structure of a cement stone with microsilica after holding at a temperature of 65 ° C, drying and firing. In the course of aging, the mineral strutlingite is additionally formed in the samples with C1. It was found that C1 promotes the active formation of the mineral anorthite, while PF? crystallization of gehlenite during firing. When a mixture of PF and C1 is used, crystallization of anorthite prevails in the sample. The results of the density and strength of concrete specimens with PF are higher than those of specimens with C1, however, the shrinkage phenomena in them are greatest. The equal ratio of PF and C1 in the mixture reduces shrinkage, allowing you to obtain the highest strength and density of concrete after firing at a temperature of 1200 ° C
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