Page 471 - Handbook of Thermal Analysis of Construction Materials

446 Chapter 10 - Non-Portland Rapid Setting Cements

Two hydration peaks are observed (similar to C S hydration). An
3
initial peak is observed on mixing; peak height is directly related to the
temperature of hydration. An induction period (0.5 hr) was observed at 0.5
hour at 25°C. The minimum rates of heat evolution (at temperatures > 25°C)
increase with temperature. A slower rate of heat evolution, but a larger total
amount of heat released was observed at 25°C. This behavior was attributed
to the retrograde solubility of hydroxyapatite along with incongruent
dissolution of the acidic constituent.

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