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Energy imparted to a batch during mixing converts to heat in the concrete. The unit estimates this mixing-energy heat at approximately:
Answer & Solution
Correct answer: A.
1. Heat balance calculations for mass concrete must include heat gained during mixing.
2. The unit reports that mixing imparts about 1390 kJ per m³ of concrete as heat.
3. For projects with rapid bucket transport between mixing and placing, this is often the only significant gain.
4. Delays and inconvenient placements add a contingency gain to the balance.
5. The other values misstate the magnitude given in the unit.
_Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._
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