What is the minimum allowable thickness for a concrete slab when it is supported directly by the ground?
Table of Contents
- 1 What is the minimum allowable thickness for a concrete slab when it is supported directly by the ground?
- 2 What are the minimum sizes for a concrete column?
- 3 What is the allowable thickness of concrete in foundation?
- 4 What is the required dimensional limit for columns?
- 5 How do you calculate the width of a concrete footer?
- 6 What is the minimum slope required for a pipe?
What is the minimum allowable thickness for a concrete slab when it is supported directly by the ground?
The thickness of concrete floor slabs supported directly on the ground shall be not less than 31/2 inches (89 mm).
What are the minimum sizes for a concrete column?
Columns should have minimum dimensions of 8″ x 8″ and may be formed by formwork on four sides or formwork on two sides with blockwork on the other two. The minimum column reinforcement should be 4- ½ diameter bars with ¼” stirrups at 6″ centres.
What is the thinnest concrete can be poured?
about 2 to 2 ½ inches
How Thin Can You Pour Concrete Over Existing Concrete? The thinnest that is usually used when pouring concrete, in general, is about 2 to 2 ½ inches. That also applies to this pouring new concrete over old concrete. Any thinner than 2 inches would be too thin.
How do you calculate minimum slab thickness?
Standards like ACI 318 have specified the minimum thickness of the slab based on the span of the slab.
- Simply Supported Slab = Span / 20.
- One End Continuous Slab = Span / 24.
- Both End Continuous Slab = Span / 28.
- Cantiliver = Span / 10.
What is the allowable thickness of concrete in foundation?
Minimum Thickness of Concrete Footing
| Type of Footing | Minimum Thickness |
|---|---|
| Masonry | 250 mm; twice the maximum projection from the face of the wall |
| Plain concrete | 200 mm, or twice the maximum offset in a stepped footing |
| Reinforced concrete (depth above bottom reinforcement) | 150mm 300mm |
What is the required dimensional limit for columns?
3- Least dimension of the column should be equal to or greater than 16 main bar diameter. 4- Least dimension of the column should be equal to or greater than 48 tie diameter. 5- Least dimension of the column should be equal to or greater than the tie spacing. 6- Strength requirements.
What is the minimum diameter of a culvert under a road?
Minimum diameter = 18 inches; culverts under roadway approaches have a minimum diameter of 12 inches 2. No minimum velocity 3. No minimum pipe slope; 10\% max for concrete, 20\% max for corrugated metal and thermoplastic pipe 4.
What is the minimum width of a building foundation?
The width of the foundation should be such that the stress on the soil is within its safe bearing capacity. 2) Minimum dimension for plinth: Plinth height may be 300 mm to 600 mm but 450 mm is more common. For waterlogging prone and important buildings, the minimum plinth height is 600 mm.
The width of the cement concrete bed of foundation = width of the brick footing immediately above the concrete bed + 100 mm + 100 mm. (i.e. 100 mm is the minimum offset for concrete bed). 5) Minimum width of footing = 2t + 2j
What is the minimum slope required for a pipe?
No minimum pipe slope; 10\% max for concrete, 20\% max for corrugated metal and thermoplastic pipe 4. The headwater and tailwater conditions determine which equations (nomographs) are used for design 5.
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