alleryStart learning →Tilting drum-type concrete mixers can satisfactorily handle aggregates up to what maximum nominal size?
AUp to about 20 mm nominal size
B150 to 200 mm
CUp to about 75 mm nominal size
DUp to about 40 mm nominal size
Answer & Solution
Correct answer: B. 150 to 200 mm
1. The drum-type mixer geometry tolerates large aggregates because mixing is by rolling.
2. The unit states tilting mixers can satisfactorily handle 15 to 20 cm aggregates.
3. Such large sizes are common in mass dam concrete, hence tilting mixers are favoured for dam work.
4. Non-tilting mixers, by contrast, are limited to about 75 mm aggregate.
5. Smaller size limits would not justify a tilting mixer on a large dam project.
_Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._
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