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

Answer: Option D

Workability of concrete refers to how easily fresh concrete can be mixed, placed, compacted, and finished.

Compacting factor is one of the measures used to assess the workability of concrete, especially in laboratory tests.

For heavily reinforced sections, concrete must be able to flow easily and fill the formwork and spaces around the reinforcement without leaving voids.

When vibration is not used, the concrete must be highly workable to achieve adequate compaction under its own weight.

A compacting factor of above 0.92 indicates high workability, which is suitable for such conditions.

Therefore, for concreting heavily reinforced sections without vibration, the compacting factor should be above 0.92.