Calculation of RCC Roof Slab Construction Cost
RCC stands for reinforced cement concrete. This type of concrete is the combination of the strength of cement and steel bars. it is a very basic element of the structural design. RCC is used to create footings, columns, beams, roofs and slabs, stairs.
Advantages of RCC
- It has a very good compression strength.
- RCC also has the strength to resist the tension.
- It is also a fire-resistant element.
- Users mold RCC in any shape.
- RCC has durability and is able to take any type of load.
Generally, depending on the slab thickness 6mm to 32mm diameter of steel bars are used. Users will need cement, coarse aggregate, fine aggregate, M.S. steel bar, binding wire, and water along with shuttering materials such as wooden planks and iron plates.
At first, users have to prepare in a formwork. Then they have to pour the concrete. After hardening the concrete the formwork is removed. RCC is used because RCC tolerates the pressure of tensile, compressive, bending, and shear forces.
Reinforcement Details of RCC Roof Slab
- The cross-sectional dimension for the column can be 9” X9” or 9” X12” with a The ideal beam size should be 9” X9” with a minimum of4 steel bars, with 2 bars of 12 MM thickness in the bottom of the beam, and 2 bars of 10 MM at the top of the beam.
- For slab thickness, it should be kept to at least 5” because at some places the slab depth may be less due to electrical pipes and internal wiring. The reinforcement details for the RCC roof in two ways:
1. One-way slab: Main steel bars of 8MM and distribution steel bars of 6MM.
2. Two-way slab: Main steel bars of 8MM and distribution steel bars of 8MM.
Calculation of construction cost for RCC Roof Slab
The construction cost for the RCC roof slab is dependent on many elements like:
1. Thickness of slab
2. One-way or two-way slab
3. Construction method and
4. The thickness of beam and column
If the RCC Roof Slab size is 25X20 sq. Ft. and the concrete mix ratio is 1:2:4 then to find out the construction cost, users will need to calculate:
- Concrete slab area
- Concrete cost
- Labor cost
- Shuttering cost
- Steel cost
The steel quantity for the slab will be 60 to 65 kg per cubic meter.
Assume that the concrete slab area is 25′ x 20′
To convert it into cubic meter
= 7.62 x 6.096 = 46.451 Sq meter
The minimum roof slab thickness is 125mm.
So 46.451 x .125
= 5.806 CUM
The Approx ready mix concrete rate is 3000/cum; and
Labor charges for Mason -3no, MC-4no
Shuttering cost is 500
So the concrete cost = (5.806×3000) + 2900+ 500
= Rs 20819/-
Common issues with RCC slabs
As buildings get older, they start signs of various wear and tear. The development of cracks in slabs is a common example. This can become very dangerous if left unattended. Such cracks in RCC slabs can be done either by taking precautions before construction or by doing repairs and placing supports when cracks appear in slabs.
Buildings with RCC frames start deteriorating within 15 years of construction. The concrete starts developing cracks or spalling. This isn’t ideal since the design life of the house is expected to be around 30-40 years, at least.
While there are many kinds of defects that can generate in a building, cracks in slabs can be the worst. The reason for this is the repair or maintenance cost of cracked slabs can be very high. Furthermore, the cracks in slabs act as an opening for water and chemicals inside the structural member, corroding it from within.
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