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
Answer: Option D
Solution (By Examveda Team)
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.
This Question Belongs to Civil Engineering >> Concrete Technology And Design Of Concrete Structures
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Comments (1)
In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively
A. Compressive and tensile
B. Tensile and compressive
C. Both compressive
D. Both tensile
Critical section for shear in case of flat slabs is (adopting standard notations)
A. At a distance of effective depth of slab from periphery of column/drop panel
B. At a distance of $$\frac{{\text{d}}}{2}$$ from periphery of column/capital/drop panel
C. At the drop panel of slab
D. At the periphery of column
A. depends on as, only
B. depends on aCbC only
C. depends on both crst and acbc
D. is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.
The diameter of ties in a column should be
A. More than or equal to one fourth of diameter of main bar
B. More than or equal to 5 mm
C. More than 5 mm but less than one-fourth of diameter of main bar
D. More than 5 mm and also more than one-fourth of diameter of main bar
For concreting of heavily reinforced sections without vibration, the compacting factor should be high, indicating high workability.
Recommended Compacting Factor: ≈ 0.95 to 1.0
This ensures the concrete can flow and fill the formwork properly even without vibration.