【Daily Topic】【Civil Engineering Version 20160818】
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Participation reward: 2 Wealth. Reward for the correct answer: 9 Wealth. When using an insert-type vibrator to mix ready-mixed concrete, it should be inserted vertically, reaching about ( ) into the lower layer of ready-mixed concrete. A、100mm B、150mm C、50mm D、200mm Correct answer: B
When vibrating ready-mixed concrete with an insert-type vibrator, it should be inserted vertically and about halfway into the lower layer of ready-mixed concrete (C, A). A、100mm B、150mm C、50mm D、200mm
(2) During the operation, the vibration rod should be allowed to sink naturally into the concrete; it is generally inserted vertically to a depth of 5–10 cm into the layer below that has not yet begun to set, in order to promote bonding between the upper and lower layers.
When vibrating ready-mixed concrete using an inserted vibrator, it should be inserted vertically and about (A) inches into the lower layer of ready-mixed concrete. A、100mm B、150mm C、50mm D、200mm