The most commonly used concrete grades is the M20 concrete with mix ratio (1:1.5:3). In this blog post we will analyse the M20 concrete mix ratio.
M20 Concrete Mix Ratio Calculation in m³, cft and kg
M20 concrete ratio is 1:1.5:3 (Cement, Sand and Coarse-Aggregate). The minimum compressive strength of M20 concrete at 28 days is 20 N/mm². This is the volumetric mix ratio in which one part of cement, one and half part of sand (fine aggregate) and three part of coarse aggregates (1:1.5:3) are mixed properly with appropriate amount of water.
What is the M20 Concrete Mix Ratio?
- The M20 concrete mix ratio is a mix proportion of 1:1.5:3 (cement : sand : coarse aggregates). This ratio means 1 part of cement, 1.5 parts of sand and 3 parts of aggregates.
- The M20 concrete mix ratio is designed to produce a minimum compressive strength of 20 N/mm² at 28 days as per IS:456:2000.
- The M20 grade concrete mix ratio can be represented as 1:1.5:3 (Cement: Sand: Aggregate). Or 1:1.5:3 ratio is presented as M20.
- It is important to note that M20 grade concrete mix ratio is measured by volume, not by weight until unless mix design.
M20 Grade Concrete Calculation
M20 concrete requires careful attention to the mix ratio of its materials. To determine the quantity of materials for M20 concrete, let us calculate materials for 1 m³ of wet concrete.
Quantity of Materials Required in 1 m³ of M20 Concrete
We are taking following standard data to calculate the quantity of materials in 1m³ of M20 grade concrete:
- Volume of Wet Concrete = 1 m³
- Ratio of M20 Concrete = 1:1.5:3
- Sum of Mix Ratio of M20 = 1+1.5+3 = 5.5
- Shrinkage Factor = 1.54 (54% extra of total dry volume)
- Unit Weight of Cement = 1440 kg/m³
- Unit Weight of Sand = 1680 kg/m³
- Unit Weight of Coarse Aggregate = 1525 kg/m³
Volume of Dry Materials For 1 m³ Wet Concrete
Volume of Dry Concrete
= Volume of Wet Concrete × Shrinkage Factor
= 1 × 1.54 = 1.54 m³
Quantity of Cement in 1 m³ of M20 Concrete
= Volume of Dry Concrete × (Proportion of Cement/Sum of Mix Ratio) × Unit Weight of Cement
= 1.54 × (1/5.5) × 1440
= 403.2 kg
Quantity of Sand in 1 m³ of M20 Concrete
= Volume of Dry Concrete × (Proportion of Sand/Sum of Mix Ratio) × Unit Weight of Sand
= 1.54 × (1.5/5.5) × 1680
= 705.6 kg
Quantity of Coarse Aggregate in 1 m³ of M20 Concrete
= Volume of Dry Concrete × (Proportion of Coarse Aggregate/Sum of Mix Ratio) × Unit Weight of Coarse Aggregate
= 1.54 × (3/5.5) × 1525
= 1281 kg
Materials Required For 1 m³ of M20 Grade Concrete
Cement = 403.2 kg
Sand = 705.6 kg
Coarse Aggregate = 1281 kg
Quantity of Ingredients of M20 Grade Concrete in m³, cft and kg
As per above calculation, the quantity of ingredients is given below.
Quantity of Dry Ingredients of M20 Grade Concrete in m³ for 1 m³ Wet Concrete
As per above calculation, the ingredients of M20 grade concrete for one cubic meter wet concrete in m³ is given below.
- Cement = 0.28 m³
- Sand = 0.42 m³
- Coarse Aggregate = 0.84 m³
Quantity of Dry Ingredients of M20 Grade Concrete in cft for 1 m³ Wet Concrete
As per above calculation, the ingredients of M20 grade concrete for one cubic meter concrete in cft is given below.
- Cement = 9.89 cft
- Sand = 14.83 cft
- Coarse Aggregate = 29.66 cft
Quantity of Dry Ingredients of M20 Grade Concrete in Kg for 1 m³ Wet Concrete
As per above calculation, the ingredients of M20 grade concrete for one cubic meter concrete in kg is given below.- Cement = 403.2 kg
- Sand = 705.6 kg
- Coarse Aggregate = 1281 kg
- Cement = 403.2 kg
- Sand = 705.6 kg
- Coarse Aggregate = 1281 kg
Water Content in M20 Grade Concrete
As per IS:10262, Table-7, maximum water content for 20 mm aggregate in mix for 25 to 50 mm slump range is 186 kg/m³.
Note: This is a volumetric calculation and we have assumed the standard unit weight of cement, sand and coarse aggregate. If the value of unit weight of any ingredients changes, the whole calculation will change.
How to Prepare M20 Concrete?
To mix M20 grade concrete, first of all select the good materials, calculate the materials required in mix and then mix the dry materials, add water to concrete, mix the concrete for 3-5 minutes, test the mixed concrete, pour and compact the concrete at required place.
Mix the All Dry Materials
In a mixing container or a concrete mixer, add the dry materials, namely cement, sand, and aggregates, and mix them thoroughly.
Add Water to Concrete
Gradually add water to the mixture while mixing until you achieve the desired consistency. The water-cement ratio should be 0.5 for M20 grade concrete.
Mix the Concrete For 3-5 Minutes
Mix the concrete for at least 3-5 minutes until it is homogeneous and has a consistent texture.
Test the Mixed Concrete
Perform a slump test to determine the workability of the concrete. The slump value for M20 grade concrete should be between 50-100 mm.
Pour and Compact the Concrete
Pour the concrete into the mold or formwork and compact it using a vibrator or a tamper. Ensure that the concrete is evenly distributed and free from any air pockets.
What are the Advantages of M20 Concrete?
Some advantages of M20 concrete is given below:
Good Strength
The M20 concrete mix ratio is designed to produce a concrete mix with a compressive strength of 20 N/mm² at 28 days, making it suitable for a wide range of applications.
Durability
M20 concrete is known for its durability, making it ideal for long-lasting structures.
Versatility
M20 concrete can be used in a wide range of applications like foundations, columns, beams, slabs, walls and many more.
Uses of M20 Concrete Mix Ratio in Construction
The M20 concrete mix ratio is a standard proportion of ingredients used to make concrete with a compressive strength of 20 megapascals (MPa) after 28 days of curing. Here are some common uses of M20 concrete mix ratio:
Foundations Casting
1:1.5:3 concrete mix ratio is commonly used for building the foundation of structures. It provides a strong base that can withstand the weight of the building.
Walls Casting
M20 concrete mix ratio can be used for constructing walls in residential, commercial, and industrial buildings. It provides good compressive strength and durability.
Beams and Columns Casting
M20 concrete mix ratio is often used for constructing beams and columns in buildings. These components require a high level of strength and durability to support the structure.
Slabs Casting
The M20 concrete mix ratio (1:1.5:3) can be used for constructing floor and roof slabs. It provides a strong and stable base that can support the weight of the building and the people or equipment inside.
Bridges Construction
This concrete mix ratio is also used in the construction of bridges. Its high strength and durability make it suitable for withstanding the weight and pressure of heavy traffic.
So, M20 concrete mix ratio is a versatile material that can be used for a variety of construction projects. Its strength, durability and affordability make it a popular choice among builders and engineers.
👉FAQs
What is M 20 Grade of Concrete?
M20 concrete is a type of concrete mix that has a compressive strength of 20 megapascals (MPa) after 28 days of curing. It is a standard grade of concrete used for a variety of construction projects, including residential, commercial and industrial buildings.
What is the Minimum Cement Content for M20 As Per IS:456:2000?
Minimum cement content for M20 grade concrete as per IS: 456 is 300 kg per meter cube and maximum cement content is 450 kg per meter cube.
M20 Concrete Mix Design Ratio?
M20 concrete is a nominal concrete with cement: sand : coarse aggregate ratio of 1:1.5:3. But if you are going to customize the concrete as per your requirements then you need to do concrete mix design. The mix design ratio would depend upon the type of material you use in the mix.
M20 Concrete Ratio for 1 Cubic Meter
M20 concrete mix ratio for 1 cubic meter is 1:1.5:3. This is a nominal ratio which is based on volume of ingredients like one part of cement, one-and-half part of sand and three part of coarse aggregate is mixed with required amount of water.
