Page 436 - Handbook of Thermal Analysis of Construction Materials
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412 Chapter 10 - Non-Portland Rapid Setting Cements
pastes containing 30% CaCO by mass of solids prepared at 2.7 water/solids
3
ratio) after curing for different times at different temperatures are plotted
in Fig. 10. At 50° and 20°C, there was no evidence of decomposition of the
calcium carboaluminate hydrate leading to the conclusion that calcium
carboaluminate hydrate decomposes at temperatures in excess of 60°C. At
this temperature, there is a continuous increase in the carboaluminate
content with time. No evidence was found that calcium carbonate addition
increases strength. Rather, when cured at 50°C the results show a loss in
strength with curing time.
Figure 8. DTA curves for high alumina cements of different degrees of conversion.
Heating rate: 20°C/min. [4]
