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Cement is normally batched dry. To avoid moisture condensation that would adversely affect strength, the unit imposes which maximum cement temperature at delivery to site storage?
Answer & Solution
Correct answer: C.
1. Cement need not be actively cooled if it stays warm enough to keep moisture from condensing.
2. Bringing cement below the surrounding atmosphere's dew point would allow moisture condensation.
3. Condensed moisture pre-hydrates the cement and damages its ultimate quality.
4. The unit therefore limits delivered cement to a maximum of 66 °C as a general rule.
5. The other ceilings are either too low (risking condensation) or too high (risking quality loss).
_Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._
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