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For _______ mixing, the materials are stacked on watertight platform, which may be either of wood, Brick or steel.

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For _______ mixing, the materials are stacked on watertight platform, which may be either of wood, Brick or steel.

(a) Machine

(b) Roller

(c) Hand

(d) Mixer

I got this question at a job interview.

This intriguing question comes from Curing of Concrete topic in portion Cement Concrete Construction of Construction & Building Materials

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The correct choice is (c) Hand

Best explanation: The mixing by hand is allowed in case of small works on unimportant work were small quantity of concrete is required. For important work, if hand mixing is to be adopted, it is advisable to use 10% more cement than specified.

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