| Abstract [eng] |
In this work was studied the influence of synthetic calcium hydroaluminate additives on the hydration of aluminum cement. It was found that CaO – Al2O3- H2O in the C/A ratio oh 1.714 during the hydrothermal synthesis yielded calcium monocarboaluminate. he maximum content of the sample is 4 hours at isothermic temperature of 130 ° C. It was found that in the system, which C / A is a compound containing the least impurity generated in 2.8 synthesis products, it is obtained from 4 hydrothermal syntheses. It has also been found that calcium monocarboaliumanate, which is fully calcified at 150 ° C is the most heat-sensitive, gypsy dehydration occurs at 240 ° C, while the formation of majenite, i.e. katoite crystallizes was identified at 310 ° C. It was investigated that both synthetic calcium monocarboxaluminate and katoite stimulate hydration of aluminum cement. The addition of synthetic calcium monocarboaluminate stimulates the initial hydration of cement specimens and shortens the induction period. In the hydration mechanism, a similar trend is observed in the hydration mechanism as in the hydration of the cement with synthetic calcium monocarboaluminate. However, the katoite supplement further reduces the induction period: 5% of the cathode induction period is shortened to 3 h, and when the 25% induction period of this additive lasts only 1.45 h. |
