RCC column cost estimation in 6 steps

RCC column cost estimation is well necessary for planning the budget of civil engineering projects. RCC columns support the heavy load of any multistorey building.

This guide describes the process of measuring and costing RCC columns using their measurements, the current material rates, and standard engineering design techniques.

How do you calculate the cost of RCC columns?

You need to list the concrete, steel reinforcement, and formwork that is needed, then use unit rates to calculate the overall cost. The process makes sure that resources and finances are used properly during the construction project.

Components of RCC Column cost Estimation:

1. Concrete Quantity Calculation
   The amount of concrete needed is figured out by considering the column’s shape and dimensions.

Rectangular Column Volume: Width x Depth x Height x Number of columns

2. Steel Quantity in RCC Column

In most cases, the amount of steel is given as a percentage of the concrete used in a structure.

To get the weight of steel, take the steel % and multiply it by the concrete volume, then multiply by 7850 kg/m³.For different structural designs, the percentage of steel can change from 1% up to 2.5%.

3. Formwork Area Calculation

RCC Column Quantity Estimator

Example: 1

RCC Column cast in the foundation footing cost estimation can be estimated from the provided plan, section drawings, local work rates.

RCC Column specification, plan and section details

• Footing size is 2 m length x 2 m wide x 0.45 m depth
• PCC 1:4:8 is utilised in foundation
• RCC 1:2:4 is utilised in footing
• 300 dia is the column size above plinth level,350 mm x 350 mm is the size from footing top-level to plinth level and  the RCC 1:2:4 is utilised,
• Reinforcement 12 mm dia @150 mm c/c both sides is utilised in footing
• Main bars 6 numbers 16 mm dia and stirrups 10mm dia @ 150 mm c/c is utilised in the column.

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RCC column cost estimation

The following 6 steps are involved in the  rcc column cost estimation including footings.

1. In foundation earthwork excavated quantity estimation.
2. PCC quantity estimation in foundation quantity.
3. RCC quantity estimation in the footing
4. RCC quantity estimation in column
5. Reinforcement quantity estimation in footing and column
6. Total cost estimation of all works

1. In foundation earthwork excavated quantity estimation

From the above-mentioned section depth of foundation excavated=0.83m.From specifications and plan length of foundation is 2 m and width is 2 m.

Earthwork excavated quantity can be estimated by=2 m length x2 m wide x 0.83 m depth=3.32 cum.

2. PCC quantity estimation in foundation quantity.

From the section, the depth of PCC in the foundation is 80 mm. From the plan length of the foundation is 2 m and the width is 2 m.

Plain cement concrete, PCC  1:4:8 is utilised in the foundation.

PCC quantity can be estimated by=2 m length x 2 m width  x 0.08 m depth=0.32 cum.

3. RCC quantity estimation in the footing

RCC 1:2:4 is utilised in footing.

From the section length of footing is 2 m, width of footing is 2 m and depth is 0.45 m

RCC quantity in footing can be calculated by = 2 m x 2 m x 0.45 m =1.8 cum.

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4. RCC column quantity estimation

RCC 1:2:4 is utilised. From the specifications,300 dia is the size and 3.3 m is the height from plinth level to slab bottom,350 mm x 350 mm is the size and height 900 mm from footing top-level to plinth level.

Quantity from footing top-level to plinth level

Concrete quantity from footing top-level to plinth level can be calculated by =0.35 m x 0.35 m x 0.9 m=0.11 cum

Quantity from footing plinth level to slab bottom

Concrete quantity from plinth top-level to slab bottom level can be calculated by =3.14 x (0.3 m x 0.3 m )/4x 3.3 m=0.233 cum

So, the total concrete quantity  =0.11 cum + 0.233 cum=0.343 cum

5. Reinforcement quantity estimation in footing and column

From specifications, Reinforcement 12 mm dia @150 mm c/c both sides is utilised in footing.

Main bars 6 numbers 16 mm dia and stirrups 10mm dia @ 150 mm c/c is utilised

Reinforcement quantity in footing

Length of the footing is 2 m and width is 2 m, clear cover =40mm

No. of bars =(clear length/spacing) +1

Clear length=total length-2 x clear cover=2 m-2 x 0.04m=1.92 m

Total No.of bars along the length of footing=(1.92/0.15)+1= 14 bars.

Similarly, Total No.of bars along the width of footing=(1.92/0.15)+1= 14 bars.

The total length of steel bar=length-2x clear cover +20 x dia.steel=2 m -2 x 0.04+ 20×0.012=2.16 m.

Unit Weight of steel= (steel dia x steel dia) /162= 12 x 12/162=0.89 kg/m

Total weight of steel quantity in footing can be calculated by=2 ways x No’s of bars x total steel length x unit weight of steel

=2 x 14 no’s x 2.16 m x 0.89 kg/m =53.82 kgs

Reinforcement quantity in column from footing to slab bottom

Length is 300 mm dia, clear cover =40mm

Main bars weight

No. of main bars =6 no’s

Total length of bar from footing to slab bottom =0.45 m+0.3 m +bottom bent-clear cover+0.6 m+3.3 m+top bent=0.45+0.3+0.15-0.08+0.6+3.3+0.1=4.89 m

Unit weight =dia x dia/162=16 x 16/162=1.58 kg/m

Total weight of main bars =No.of bars x total length x unit weight=6No’s x 4.89 m x 1.58 kg/m=46.35 kgs

Stirrups weight

For stirrups 10mm dia @ 150 mm c/c is utilised.

Length in which stirrups is utilised =3.3 m +0.6 m +0.3 m=4.2m

No. of bars =(clear length/spacing) +1

So, No of bars=(4.2/0.15)+1=29 no’s

Clear length of bar=3.14 x (total dia-2 x clear cover)=3.14 x (0.3 m-2 x 0.04m)=0.7 m

Unit Weight of steel= (steel dia x steel dia) /162= 10 x 10/162=0.62 kg/m

Total weight of steel quantity in stirrups can be calculated by= No’s of bars x total steel length x unit weight of steel

= 29 no’s x 0.7 m x 0.62 kg/m =12.58 kgs

So,total weight of steel in footing and column=53.82 kgs +46.35 kg +12.58 kg=112.75 kg=0.112 MT

6. Total RCC column cost estimation of all works

For total cost estimation,local rates which includes material and labour are considered for all works.

Rate of cement concrete includes material and labour cost of shuttering but excludes steel material and labour cost are considered in the cost estimation.

Rate of steel includes material and labour charges are considered in cost estimation.

Conclusion:

So from the above steps RCC column cost estimation can be calculated very easily.

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