For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be________________?

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For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be________________?

A. 0.75-0.80
B. 0.80-0.85
C. 0.85 – 0.92
D. above 0.92