M20 Concrete Ratio (1:1.5:3) : Uses & Materials Required

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M20 concrete ratio is 1:1.5:3. It indicates the cement:sand: aggregate ratio. It simply means that if 1 kg cement is used for making Concrete, you should use 1.5 kg sand and 3 kg aggregate. ( i.e. 1 part cement: 1.5 parts sand: 3 parts aggregate )

✔ In M20 concrete,

m20 concrete ratio

“M” stands for Mix ratio of cement:sand: aggregate  &  “20 “Stands for Compressive Strength @ 28 Days in N/mm².

✔ M20 Concrete is nominal Concrete that can be skillfully prepared using Indian Standard IS 456:2000.

✔ Normally, about 38% of water is required for the complete hydration of Concrete.

As per Indian Standard IS 456:2000 for nominal mix ( i.e., M10, M15…, M25), the w/c ratio varies from 0.4 to 0.6.

For M20 Concrete, commonly w/c ratio of 0.45 to 0.50 is used.

 


 

  1. Table1: M20 Concrete Ratio – Overview  

 

CodeIndian Standard 10262(2009).
Ratio1:1.5:3
Compressive Strength20 MPa
{ Note: MPa = N/mm²}
UsesUsed in RCC works like;

a. Rigid Pavement Construction

b. Used to construct structural members like slabs, beams, columns, etc. (for small to medium structures only. Not suitable for heavy structures or work).

c. Water retaining structures, piles, etc.

Grade CategoryNormal Grade ( Nominal Mix )
Required  Water Cement Ratio  

a. For high-quality concrete works; 0.45 w/c ratio is specified.

b. Minimum water-cement ratio: 0.45

c. Maximum water-cement ratio: 0.50

 

 


 

  2. M20 Concrete Ratio Uses  

This concrete grade is commonly used for small to medium-scale constructions. Some common uses of the M20 Concrete Ratio are:

m25 grade concrete ratio

 

✔ Used in the construction of water retaining structures.

✔ Used to construct piles and other general RCC structures.

✔ Used to build retaining walls, buildings, landscaping & architectural designs, etc.

 


 

  3. Cement Sand Aggregate Calculation For 1 m³ M20 Concrete Ratio  

 

Data per 1 m³ of M20 Concrete Ratio

MaterialVolume Required (m3)Materials Required in kg
Cement0.28403.2
Fine Aggregate0.42619.85
Coarse Aggregate0.841359.82
Water0.190190 kg ( Average )

 

Things To Know!!

Density of Cement = 1440 kg/m3

Density of Sand = 1450-1500 Kg/m3

Density of Aggregate = 1450-1550 Kg/m3

Weight of Cement in 1 Bag = 50 Kg

Volume of 1 Bag of Cement in Cubic meter = 0.03472 m3

 

Now, Taking

Grade of Concrete = M20 Concrete

Mix Ratio = 1:1.5:3

Total sum of ratio =1+1.5+3 =5.5

Wet volume of Concrete = 1 m3.

To get dry volume, wet volume increased by 54%

Dry volume of concrete = 1 + 0.54 = 1.54 m³

 

i. Cement Quantity Calculation

Quantity of cement = (Own Ratio/ Total sum of ratio) * Dry Volume

= ( 1/5.5 ) * 1.54

=  0.28 m³

Cement in kg = volume of cement * density of cement

= 0.28 * 1440

= 403.2 kg

 

ii. Sand Quantity Calculation 

Quantity of sand = (Own Ratio/ Total sum of ratio) * Dry Volume

= ( 1.5/5.5 ) * 1.54

=  0.42 m³

 

iii. Aggregate Quantity Calculation 

Quantity of aggregate = (Own Ratio/ Total sum of ratio) * Dry Volume

= ( 3/5.5 ) * 1.54

=  0.84 m³

 

iv. Water Calculation

For inferior-quality concrete: W/C ratio = 0.5

For superior-quality concrete: W/C ratio = 0.45

Minimum amount of water required per m³ = 0.45 * 403.2 = 181.44 kg 

Maximum amount of water required per m³ = 0.5 * 403.2 = 201.6 kg

 

  4. References  

1. Indian Standard IS 456:2000

 

Read Also: Grades of Concrete
Verified Article By Er. Madhu Krishna Poudel

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