Discussion
State whether the following is true or false.
High alumina cement can lose strength over time under warm and damp conditions.
Answer: B
Correct answer: True
The metastable hydrates formed initially convert over time to a stable but denser form, and because the solid occupies less volume the paste becomes more porous and loses strength. Warmth and moisture accelerate the conversion greatly. A series of structural failures in the 1970s ended its use in structural concrete in Britain, and it is now used for refractory and rapid-repair work where the effect is allowed for.
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