Abstract
Friedel's Salt is a poorly understood phase in the CaO‐Al2O3‐CaCl2‐H2O system, which is critical in the function and stability of salt‐saturated portland cement‐based grouts. Such grouts are required to seal exploratory excavations in a radioactive waste repository sited in bedded salt. The phase equilibria of this system were investigated, and four quaternary invariant points were determined to allow construction of a phase diagram. The diagram is constructed using a plotting technique applicable to double‐decomposition systems or systems with a reciprocal salt pair. Statistical analysis of solution data was performed to assess the precision and accuracy of the invariant points.
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