Phase Composition of Hydration Products of Portland Cement Mechanically Activated in a Vortex Layer Apparatus with Additives of Various Nature

Abstract

he article presents the results of studies of the influence of the nature of superplasticizers on the phase composition of cement stone hardened for 1 and 28 days under normal humidity conditions. It has been established that the activation of Portland cement in the apparatus of the vortex layer reduces the content of non-hydrated minerals of Portland cement clinker. The amount of hydration products of cement stone hardened within 1 day, obtained in the traditional way, decreases with the introduction of additives: C-3 → SP10 → MF. The joint grinding of the studied additives with Portland cement in the vortex ayer apparatus contributes to an increase in the amount of hydration products by 4–35%, depending on the type of additive, and in terms of the effectiveness of their increase, it is located in the series: C-3 → SP10 → MF. On the 1st day of hardening, the strength of the cement stone largely depends on the characteristics of the crystals in the cement stone, while the strength of the cement stone increases with a decrease in the reduced size of the mosaic block of all identified phases of the cement stone.