Synthetic Calcium Aluminate Cements (CAC) were prepared from pure synthesised CA, CA2 and/or corundum to investigate the influence of accelerating additives on the hydration and the development of the hydration products of Calcium Aluminate Cements. The hydration experiments of two synthetic mixtures were performed with a isothermal heat flow calorimeter  over a period of 72h at 23.0°C ±0.3°C (w/c=0.45). Synthetic CAC M3 was mixed from 50 ma.% CA and 50 ma.% CA2 whereas the composition of mixture M4 was formulated to resemble technical CAC clinker with 60 ma.% CA, 34 ma.% CA2 and 6 ma.% A. Each calorimeteric measurement was performed three times. By adding inorganic additives to the synthetic CAC, either 5 ma.% CH or 0.02% Li2CO3-solution, the maximum of heat flow is shifting to shorter hydration times and the measurement becomes very reproducible. The combination of heat flow calorimetry with in-situ XRD of the synthetic CAC proved that the heat of hydration can be related to the dissolution of CA and CH (only one mixture) and the formation of hydration products, C2AH8 and C2AH7.5.
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