Discussion
Consider the following statements about special cements.
1. Calcium aluminate cement is used in refractory castables.
2. Magnesium phosphate cement is used where rapid reopening matters.
3. Sorel cement is preferred for exterior structural work.
Answer: A
The first two are correct. The third is wrong, since magnesium oxychloride cement has poor water resistance and is confined to protected interior applications such as flooring. Water resistance is its defining weakness.
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