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Study of an alternative binder based on the carbonation of ladle funace slag
Mikulová, Mária ; Koplík, Jan (oponent) ; Másilko, Jiří (vedoucí práce)
This master’s thesis is focused on the investigation of the chemical processes during the carbonation of a ladle furnace slag (LFSU) and on the investigation of the long-term development of the composition and selected properties of carbonated compacts of LFSU. The main mineralogical phases of the LFSU, -dicalcium silicate (-C2S) and -dicalcium silicate (-C2S), were synthetised for the study. The carbonation reactivity of these phases was examined by perfusion calorimetry. A significantly higher reactivity with CO2 for -C2S was observed. The development of compressive strength, changes in weight and length, and changes in phase composition of carbonated compacts of LFSU in four different environments (distilled water, room temperature; 100% relative humidity, room temperature; 60% relative humidity, 25 °C; exterior) during one year after carbonation were studied. A tendency of compressive strength increase in the first six months after carbonation and a decrease in compressive strength after one year from carbonation was observed in all environments. The long-term increase in compressive strength was mainly caused by hydration of -C2S and mayenite. The decrease in compressive strength after one year could have been caused by hydration of MgO to Mg(OH)2. This, however, was not clearly proved.
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