How To Calculate The Concrete For Combined Foundation

Definition of Combined foundation is that foundation which have footing with column or pedestal more the one. Combined foundation is design for two three or for columns. This foundation is also called Raft foundation. Calculate the Concrete for Combined Foundation. Concrete For Combined Foundation. How To Calculate The Concrete For Combined Foundation

What is The Combined Foundation?

Definition of Combined foundation is that foundation which have footing with column or pedestal more the one. Combined foundation is design for two three or for columns. This foundation is also called Raft foundation.

How To Calculate The Concrete For Combined Foundation

Calculate the concrete for combined foundation with the help of some given data. Combined foundation means footing with column or pedestals.

Given Data 

Footing Details

Length of the footing = L = 2000mm= 2m

Width of the footing = W= 1500mm= 1.5m

Height of the Footing = H = 500mm = 0.500m

Ratio of concrete = 1:1.5:3

Sum of Ratio = 1+1.5+3=5.5

Column or Pedestal Detail

Column or Pedestal Qty = 4

Height of the column = H =1800mm = 1.8m

Length of the column= x = 500mm= 0.500m

Width of the Column = y = 500mm = 0.500m

Ratio of concrete = 1:1.5:3

Sum of Ratio = 1+1.5+3=5.5

Solution 

Concrete Volume for Footing

Volume of the concrete for the footing= L × W × H

How to Calculate the Bar Bending Schedule of The Footing

Volume of the concrete for the footing = 2 × 1.5 × 0.500=1.5m³

Concrete Volume for Columns 

Volume of the concrete for the Column = L × W × H

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Volume of the concrete for the Column = 0.500 × 0.500 × 1.8 = 0.45m³

This volume of concrete for one column or pedestal

we know we have 4 columns or pedestals

so

The Total volume of concrete for Four Columns = 0.45 × 4 = 1.8m³

Total volume of concrete for combined foundation

Total volume of concrete for combined foundation = volume of footing + volume of columns

Total volume of concrete for combined foundation = 1.5m³+ 1.8m³ = 3.3m³

This is the wet Volume of the Concrete =  3.3m³

To convert the Dry volume of the concrete is multiply to 1.54

SO

The dry volume of the combined foundation = wet volume of the concrete x Dry Volume of the concrete

The dry volume of the combined foundation = 3.3 x 1.54 = 5.083m³

10 % Waste materials = 5.083/100 x10 =  0.5083

Total dry volume of concrete = 5.083 + 0.5083 = 5.591m³

We using the Ratio of concrete = 1: 1.5 :3

1 = Cement 

1:5 = Sand 

3 = Aggregates 

Sum of Ratio = 1+1.5+3=5.5

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Total Cement Bags

Volume of Cement = 1 / sum of ratio x total dry volume

Volume of Cement = 1/5.5 x 5.591 = 1.0164m³

Density of Cement = 1440kg/m³

Weight of Cement = 1.016 x 1440 = 1463.616kg

weight of one bag = 50kg

Total bag of Cement = 1463.616 / 50 = 29.272 = 30Bags

Volume of sand

Volume of sand = 1.5 / sum of ratio = total dry volume

Volume of sand = 1.5  / 5.5 x 5.591

Volume of sand = 1.5248m³

Volume of Aggregates

Volume of Aggregates = 3 / sum of ratio x total dry volume

Volume of Aggregates = 3 / 5.5 x 5.5914

Volume of Aggregates = 3.0498m³

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