Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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EFFECT OF ADDITIVES IN THE FORM OF NANO- AND ULTRAFINE POWDERS OF CALCIUM SILICATES ON THE MICROSTRUCTURE AND PERFORMANCE PARAMETERS SILICATE PRODUCTS

Nesterov A.A., Ryss B.Y. 1 Karyukov E.V. 1 1
1 Southern Federal University
It is shown that the limiting stages of forming binder (consisting of calcium silicate hydrate) in silica brick compacts are the processes of nucleation and crystallization. We propose the method of adding to the raw mass of pre-synthesized nano-and ultrafine powders of Ca2SiO4 • xH2O to reduce the activation energy. This technique could strongly increase the number of nucleation sites per volume unit, which contributes to the reaction zone area between crystalline particles Ca2SiO4 • xH2O and saturated (calcium hydroxide and silicon oxide) dissolves. These changes contribute to the observed increase in the rate of crystallization of calcium silicates and increase the dissolution rate of the starting materials. Increasing the rate of these processes is to reduce the processing time of initial blanks in autoclaves, the increase in the mass fraction of binder in the samples, reducing the porosity of the target product, and achievement of the brand strength of more than 300 and frost resistance of the order of 75F.