Discussion
Refractory castables based on calcium aluminate cement are used because the binder
Answer: D
Correct answer: retains strength at temperatures that would destroy Portland cement
Portland cement dehydrates and loses strength above a few hundred degrees. Calcium aluminate cement converts to ceramic bonds instead and continues to serve well beyond a thousand, which makes it the standard binder for refractory castables. It is considerably more expensive and sets faster, not slower.
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