Abstract
It was determined that at 22.31 wt.%, Fe 2O 3 reached a maximum solid solution in 3CaO · 3Al 2O 3 · CaSO 4 by replacing Al 2O 3. The physical properties of the compound with and without Fe 2O 3 were measured and these are combined with the analysis of the hydration process and products by using XRD, DTA and calorimeter equipment to determine the heat of hydration etc. The results show that there was no tricalcium aluminate hexahydrate (3CaO · 3Al 2O 3 · 6H 2O) formed in any of the samples. The addition of Fe 2O 3 into the (3CaO · 3Al 2O 3 · CaSO 4 caused an initial decrease in the early compressive strength but not much in the final strength. Further, the sample with Fe 2O 3 has a lower hydration heat.
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