Quantity of cement sand and Aggregate

 

Concrete mix ratios are the proportions of concrete components such as cement, sand, aggregates and water. These mix ratios are decided based on type of construction and mix designs. However, building codes provides nominal and standard concrete mix ratios for various construction works based on experience and testing. These types of concrete mix ratios are discussed in this article.

Point should be know before estimating

Density of cement = 1440 kg/m3 –

Size = 50kg bag = 34.7 liters

1 bag to m3 = 0.0347 m3

1 bag to cft = 1.226 cft

 

No of bags in 1 m3 = 28.8 bags

Specific gravity of cement = 3.15

Grade of cement = 33, 43, 53 Grade

Sand = 1450 – 1500 kg/m3

Aggregate = 1450 – 1550 kg/m3

Concrete Grade	Mix Ratio	Compressive strength
		Mpa ( N/mm^2)	Psi
M5	1:5:10	5 Mpa	725 Psi
M10	1:3:6	10 Mpa	1450 Psi
M15	1:2:4	15 Mpa	2175 Psi
M20	1:1.5:3	20 Mpa	2900 Psi
M25	1:1:2	25 Mpa	3625 Psi
M30	Design Mix	30 Mpa	4350 Psi

 

Now we start calculation to find cement sand and aggregate quantity in 1 m3 concrete for M20 grade = 1:1.5:3

Dry volume = 1 x 1.54 = 1.54

·       Cement = ( 1/5.5 ) x 1.54

= (0.28 x density)/ weight of 1 cement bag

= 0.28 x 1440/ 50

= 8 bags

·       Sand = ( 1.5/5.5 ) x 1.54

 = (0.42 x density)

 = 0.42 x 1450

 = 609 kg

1m3 to cft = 35.31 cft

0.42 x 35.31 = 14.83 cft

 

·       Aggregate = ( 3/ 5.5 ) x 1.54

 = 0.84 m3 x density

 = 0.84 x 1500 = 1260 kg

1m3 to cft = 35.31 cft

0.84 x 35.31 = 29.66 cft

 

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