**How to calculate cement sand and aggregate quantity in m15 concrete**

**◆ quantity of cement sand and aggregate in m15 concrete**

**◆ introduction:-** in this topic we know about how to calculate cement sand and aggregate quantity in m15 concrete. We know that concrete is mixture of cement sand and aggregate in fixed proportion, there is a several grade of concrete like **M10, M15 ,M20 m25** and so on, but in this topic we only know about m15 grade of concrete

**◆ m15 grade of concrete :-** in m15 grade of concrete M stand for mix and numerical figure 15 is stand for comprehensive strength of concrete which is gain in 28 days of curing time. And ratio in m15 grade of **concrete is ( 1 : 2 :4) in which one part is cement two part is sand and 4 part is aggregate**

**■ water cement ratio :-** ratio of weight of water to the weight of cement is the water cement ratio which is **about 0.4 to 0.6 as per IS code 10262 (2009) four different grade of concrete like M10, M15 ,M20 ,m 25 —**

**How to calculate cement sand and aggregate quantity in m15 concrete**

**1) quantity calculation of cement**

Mix ratio = 1:2:4

Total P = 1+2+4=7

Part of cement = 1/7

Part of sand = 2/7

Part of aggregate = 4/7

Assume volume of conc. = 1m3

So wet volume = 1 m3

Dry volume = wet volume × 1.54

Dry volume = 1m3× 1.54

Dry volume = 1.54 m3

Density of cement = 1440 kg/m3

Volume of cement = (1/7) 1.54 m3

Volume of cement = 0.22 m3

Weight = volume × density

Weight = (1/7) × 1.54 m3× 1440 kg/m3

Weight = 316.8 kg

1 bags cement = 50 kg

No of cement bags = 316.8/50= 6.336 bags

**2) quantity of sand in cuft**

1m3 = 35.32 cuft

Volume of sand =( 2/7) 1.54 × 35.32

Volume = 15.54 cuft

**3) quantity of aggregate in CFT**

Volume = (4/7) 1.54 × 35.32

Volume = 31 cuft

**4) water cement ratio :-** weight of water to weight of cement is water cement ratio .water cement ratio for m15 grade of concrete is about 0.50

Volume of cement = 0.22 m3

1m3 = 1000 litre

Volume of cement = 0.22×1000=220 litre

Volume of water/volume of cement= 0.5

Volume of water= 220×0.5=110 litre

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So quantity of cement sand aggregate and water in m15 grade of 1m3 concrete is

Number of cement bags = 6.336

Quantity of sand =15.54 cuft

Quantity of aggregate = 31 cuft

Quantity of water = 110 litre