The effect of mechanical activation on the setting time and exothermic heating temperature of cement dough with the addition of chamotte
Year: 2026
Type: conference-paper
Abstract: The article considers the influence of mechanical activation on the speed and intensity of structure formation of hardened modified Portland cement (fireclay + C-3) by determining the terms of hardening and the temperature of exothermic heating of the cement paste. The influence of the concentration of ground fireclay, its specific surface area is revealed (250....450 m 2 /kg) and the method of preparation of cement pastes on the temperature of exothermic heating and the terms of hardening. It has been experimentally proven that mechanical activation of the studied cement pastes affects both the kinetics of the increase in the temperature of hardening of the paste and its maximum heating. For activated paste, the maximum is reached within 8–10 hours, while in non-activated Portland cement the process is extended in time with a peak only after 12–14 hours. The hardening times of such pastes are reduced. Mechanical activation simultaneously increases the reactivity of the system, accelerates the hardening time and provides a higher level of exothermic heating compared to traditional methods of preparing mixtures. The concentration of ground chamotte and the method of preparing the paste determine the intensity of early structure formation. Finely dispersed chamotte contributes to the formation of a denser crystallization framework in the early stages of hydration. Increasing the specific surface area of fireclay leads to a proportional increase in the temperature of exothermic heating.
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7166178648