The mix ratio for M15 grade concrete is typically 1:2:4. This means that for each 1 box of cement, you have to add 2 boxes of fine aggregate and 4 boxes of coarse aggregate.
1 box of cement : 2 boxes of fine aggregate : 4 boxes of coarse aggregate
Let us calculate the quantities of Cement, Fine aggregate, Coarse aggregate and Water quantity to get 1 m3 of Concrete.
Concrete Grade M15 Ratio = 1:2:4
Total number of boxes = 1+2+4 = 7 boxes.
Total volume needs to be calculated = 1 m3
Volume of Cement:
Volume of cement/Total Volume = 1/7
Volume of cement = 1/7 * Total Volume
= 1/7 * 1
= 0.143 m3
Volume of Fine Aggregate:
Volume of Fine Aggregate/Total Volume = 2/7
Volume of Fine Aggregate = 2/7 * Total Volume
= 2/7 * 1
= 0.286 m3
Volume of Coarse Aggregate:
Volume of Coarse Aggregate/Total Volume = 4/7
Volume of Coarse Aggregate = 4/7 * Total Volume
= 4/7 * 1
= 0.572 m3
Volume of Water:
Water-Cement Ratio = 0.45
Volume of Water/Volume of Cement = 0.45
Volume of Water = 0.45 * Volume of cement
= 0.45 * 0.143
= 0.06435 m3
= 0.06435 * 1000 lit (1 m3 = 1000 liters)
= 64.35 liters
For M15 Grade of Concrete, the quantities in m3 are :
Cement : Fine Aggregate : Coarse Aggregate = 0.143 m3 : 0.286 m3 : 0.572 m3
For M15 Grade of Concrete, the quantities in kgs are :
To calculate the quantity in kgs, we have to find the density of Materials,
As per NBC;
The density of cement = 1440 kgs
The density of River sand = 1840 kgs
The density of Broken Ballast Stone = 1600 kgs
Cement : River Sand : Ballast stone = 0.143 * 1440 kgs : 0.286 * 1840 kgs : 0.572 * 1600 kgs
Cement : River Sand : Ballast stone = 205.92 kgs : 526.24 kgs : 915.2 kgs
Cement : River Sand : Ballast stone = 206 kgs : 526 kgs : 915 kgs
Summary:
- Mix Ratio: 1:2:4 (Cement: Sand: Coarse Aggregate)
- Total Volume: 1 m³
1. Cement:
- Volume = 0.143 m³
- Density = 1440 kg/m³ (as per NBC)
- Quantity = (Volume * Density) ≈ 206 kg (or 4.2 bags)
2. Sand (River Sand, Dry):
- Volume = 0.286 m³
- Density = 1840 kg/m³ (as per NBC)
- Quantity ≈ 526 kg
3. Coarse Aggregate (Ballast Stone, Dry):
- Volume = 0.572 m³
- Density = 1600 kg/m³ (as per NBC)
- Quantity ≈ 915 kg
4. Water:
- Water-Cement Ratio = 0.45
- Volume of Water = 0.45 * Volume of Cement
- Quantity = (Volume of Water * 1000) ≈ 64.35 liters
