Discussion
High alumina cement is valued for its
Answer: D
Correct answer: very rapid strength gain and resistance to chemical attack
High alumina cement reaches in a day the strength Portland cement takes a month to develop, and it resists sulphate and acid attack well, so it is used for refractory concretes and urgent repairs. It has a large heat of hydration, is expensive, and is subject to conversion of its hydrates in warm damp conditions with loss of strength - which is why its structural use is restricted.
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