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Bottom-dump buckets are used to place concrete underwater. The discharge gate of a bottom-dump bucket is:
Answer & Solution
Correct answer: D.
1. Underwater placement demands that the bucket reach the placement zone before any discharge begins.
2. The unit states the discharge gate is necessarily remote-controlled by a separate line after the bucket has landed.
3. Once landed on previously placed concrete, the gate is opened and concrete discharges slowly.
4. A funnel top and a slow lift control turbulence and minimise washout of mortar.
5. Lift-hook tripping, water-pressure triggers and timers are not the mechanism described.
_Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._
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