In this article we will determine how much of cement , sand and coarse aggregates will be required to construct a slab of length;10m, width; 5m and thickness 0.15m(150mm)
Reinforced concrete is in the ratio 1:2:4.
Meaning one part of cement to two parts of fine aggregates to four parts of coarse aggregates.
Volume of the slab is length x breadth x thickness.
I.e 10 x 5 x 0.15= 7.5m³.
Dividing this volume in ratio 1: 2: 4
Volume of cement is;
The density of cement is 1500kg/m³
density= mass/ volume
Therefore mass of cement ;
1500x 1.07= 1605kg
A bag of cement weights 50kg so dividing 1650/50= 33 bags.
Mass of sand;
Volume of sand is( 2/7 )x 7.5= 2.14m³
Density of sand is 1700kg/m³
Therefore mass of sand = density x volume;
1700 x 2.14= 3638kg
Mass of coarse aggregates;
Volume of coarse aggregates is (4/7)× 7.5= 4.29m³
Density of coarse aggregates is 1650kg/m³
Therefore mass of coarse aggregates,
1650 x 4.29= 7078.5 kg