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A reinforced concrete slab is 75 mm thick. The maximum size of reinforcement bar that can beused is
- a)12 mm diameter
- b)10 mm diameter
- c)8 mm diameter
- d)6 mm diameter
Correct answer is option 'C'. Can you explain this answer?
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A reinforced concrete slab is 75 mm thick. The maximum size of reinfor...
Given:
Reinforced concrete slab thickness = 75 mm
To find:
The maximum size of reinforcement bar that can be used
Solution:
To determine the maximum size of reinforcement bar that can be used, we need to consider the minimum cover requirement and the maximum aggregate size.
Minimum cover requirement:
The minimum cover is the distance between the surface of the reinforcement and the outer surface of the concrete. It is necessary to ensure that the reinforcement is protected from corrosion and fire. The minimum cover requirement is specified in the design codes or standards, and it depends on the exposure conditions and the type of reinforcement.
Let's assume the minimum cover requirement is 25 mm.
Maximum aggregate size:
The maximum aggregate size is the largest size of the particles of aggregate used in the concrete mix. It is limited to ensure good workability of the concrete and to prevent segregation of the mix. The maximum aggregate size is typically specified in the mix design or the construction specifications.
Let's assume the maximum aggregate size is 20 mm.
Effective depth:
The effective depth of the slab is the distance from the center of the reinforcement to the outer surface of the concrete. It is equal to the thickness of the slab minus the minimum cover requirement.
Effective depth = Slab thickness - Minimum cover
Effective depth = 75 mm - 25 mm = 50 mm
Diameter of reinforcement bar:
The diameter of the reinforcement bar should be less than or equal to one-eighth of the effective depth.
Diameter of reinforcement bar ≤ 1/8 * Effective depth
Diameter of reinforcement bar ≤ 1/8 * 50 mm
Diameter of reinforcement bar ≤ 6.25 mm
Therefore, the maximum size of reinforcement bar that can be used is 6 mm (option d).
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A reinforced concrete slab is 75 mm thick. The maximum size of reinforcement bar that can beused isa)12 mm diameterb)10 mm diameterc)8 mm diameterd)6 mm diameterCorrect answer is option 'C'. Can you explain this answer?
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