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 DataÂ
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
SolutionÂ
Concrete Volume for Footing
Volume of the concrete for the footing= L Ă— W Ă— H
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Volume of the concrete for the footing = 2 Ă— 1.5 Ă— 0.500=1.5mÂł
Concrete Volume for ColumnsÂ
Volume of the concrete for the Column = L Ă— W Ă— H
Volume of the concrete for the Column = 0.500 Ă— 0.500 Ă— 1.8 = 0.45mÂł
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 Ă— 4 = 1.8mÂł
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 = 1.5mÂł+ 1.8mÂł = 3.3mÂł
This is the wet Volume of the Concrete =Â 3.3mÂł
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 = 5.083mÂł
10 % Waste materials = 5.083/100 x10 =Â 0.5083
Total dry volume of concrete = 5.083 + 0.5083 = 5.591mÂł
We using the Ratio of concrete = 1: 1.5 :3
1 = CementÂ
1:5 = SandÂ
3 = AggregatesÂ
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 = 1.0164mÂł
Density of Cement = 1440kg/mÂł
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 = 1.5Â / 5.5 x 5.591
Volume of sand = 1.5248mÂł
Volume ofÂ Aggregates
Volume of Aggregates = 3 / sum of ratio x total dry volume
Volume of Aggregates = 3 / 5.5 x 5.5914
Volume of Aggregates = 3.0498mÂł
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