| Abstract [eng] |
The aim of the final master's project is to determine the influence of industrial waste on the crystallization of calcium hydro silicates under hydrothermal synthesis conditions. To investigate the effect of synthesis temperature and duration on the formation of calcium hydro silicates, hydrothermal syntheses were conducted at temperatures of 175 °C, 200 °C, and 225 °C, with isothermal holding times ranging from 16 hours to 72 hours. Five mixtures were prepared, consisting of calcium carbonate, quartz sand, and industrial waste (granite and dolomite sieves). In order to determine the influence of dolomite and granite sieves and their quantity on the synthesis of calcium hydro silicates, in the second and fourth mixtures, 5% and 10% of calcium carbonate were respectively replaced with dolomite sieves, while in the third and fifth mixtures, 5% and 10% of quartz were replaced with granite sieves. The synthesis suspensions were carried out without stirring, with saturated water vapor temperatures of 175 °C, 200 °C, and 225 °C, and isothermal holding times of up to 72 hours. The obtained results were analyzed using instrumental analysis methods for the identification and characterization of powdered materials (RSFA, RSDA, VTA, DSK, FTIR). To determine the influence of the quantity of synthetic products on the heat released during OPC hydration, 5%, 10%, and 15% of portland cement were replaced with synthetic products (175 °C, 16 h, 5% granite or dolomite sieves). To investigate the effect of burned additives (600 °C, 800 °C, 1000 °C) on the heat released during OPC hydration, 10% of OPC was replaced with burned synthetic additives. The mixtures were analyzed using a microcalorimetric analysis method. |
