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_________ vibrators are mounted on platforms or screeds.

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_________ vibrators are mounted on platforms or screeds.

(a) Form vibrators

(b) Surface vibrators

(c) Shutter vibrators

(d) Immersion vibrators

The question was posed to me in an internship interview.

This interesting question is from Curing of Concrete topic in portion Cement Concrete Construction of Construction & Building Materials

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The correct choice is (b) Surface vibrators

Easy explanation: Surface vibrators are used to finish concrete surface as a bridge floors, roads slabs, station platform, etc. These vibrators are found to be more effective for compacting very dry concrete mixes because the vibration acts in the same direction of gravity and the concrete is compacted in the confined zone.

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