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Embedded post-cooling pipes carry circulating cool water through hardened concrete. The unit specifies pipe outer diameter and wall thickness as:
Answer & Solution
Correct answer: D.
1. Embedded cooling coils are thin-wall tubing chosen for heat transfer and ease of installation.
2. The unit specifies 25 mm nominal outer diameter and 1.5 mm wall thickness for both materials.
3. Aluminium tubing is light and easy to install but corrodes under cement chemistry.
4. For estimated active cooling periods exceeding 3 months, steel tubes should be used instead.
5. The other dimension pairs do not match the specified embedded-pipe geometry.
_Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._
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