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Effective compaction is not achieved by ____________ rollers.

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Effective compaction is not achieved by ____________ rollers.

(a) Rubber tyred

(b) Sheep’s foot

(c) Pneumatic

(d) Smooth wheeled

I had been asked this question during a job interview.

My enquiry is from Hoisting Equipments topic in chapter Construction Equipments of Construction & Building Materials

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The correct answer is (d) Smooth wheeled

For explanation: The performance of three wheeled roller is a better as compared to a two wheel unit because of the concentration of pressure on the middle wheel when the roller passes over a spot in the surface that is being compacted. The single wheel roller has diameter of about 900 mm and length of about 1.20 metres.

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