 Strength and durability
 Workability
 Economy
 specifications
Contents:
 Concrete Mix Design Procedure as per is 10262 β 2009
 Step 1: Calculation of Target Strength of Concrete
 Step 2: Selection of WaterCement Ratio
 Step 3: Determination of Aggregate Air content
 Step 4: Selection of Water Content for Concrete
 Step 5: Selection of Cement Content for Concrete
 Step 6: Calculation of Aggregate Ratio
 Step 7: Calculation of Aggregate Content for Concrete
 Step 8: Trial Mixes for Testing Concrete Mix Design Strength
Concrete Mix Design Procedure as per is 10262 β 2009
Procedure for concrete mix design requires following step by step process: Calculation of target strength of concrete
 Selection of watercement ratio
 Determination of aggregate air content
 Selection of water content for concrete
 Selection of cement content for concrete
 Calculation of aggregate ratio
 Calculation of aggregate content for concrete
 Trial mixes for testing concrete mix design strength
Step 1: Calculation of Target Strength of Concrete
Target strength is denoted by f_{t }which is obtained by characteristic compressive strength of concrete at 28 days (f_{ck}) and value of standard deviation (s)f_{t }= f_{ck} + 1.65 s
Standard deviation can be taken from below tableGrade of concrete  Standard deviation (N/mm^{2}) 
M10  3.5 
M15  3.5 
M20  4.0 
M25  4.0 
M30  5.0 
M35  5.0 
M40  5.0 
M45  5.0 
M50  5.0 
Step 2: Selection of WaterCement Ratio
Ratio of the weight of water to weight of cement in the concrete mix is watercement ratio. It is the important consideration in concrete mix design to make the concrete workable. Water cement ratio is selected from the below curve for 28 days characteristic compressive strength of concrete.Fig: Selection of WaterCement Ratio for Concrete Mix Design
Similarly, we can determine the watercement ration from the 7day concrete strength, the curves are divided on the basis of strength from water cement ratio is decided. Which is observed from the below graph.Fig: Concrete Compressive Strength vs. Water Cement Ratio
Step 3: Determination of Aggregate Air content
Air content in the concrete mix is determined by the nominal maximum size of aggregate used. Below table will give the entrapped air content in percentage of volume of concrete.Nominal maximum size of aggregate  Air content (% of volume of concrete) 
10mm  5% 
20mm  2% 
40mm  1% 
Step 4: Selection of Water Content for Concrete
Select the water content which is useful to get required workability with the help of nominal maximum size of aggregate as given in below table. The table given below is used when only angular shaped aggregates are used in concrete as well as the slump should be 25 to 50mm.Nominal maximum size of aggregate  Maximum water content 
10mm  208 
20mm  186 
40mm  165 
Condition  Adjustment 
Sub angular aggregate 
Reduce the selected value by 10% 
Gravel with crushed stone 
Reduce the selected value by 20kg 
Rounded gravel 
Reduce the selected value by 25kg 
Using plasticizer 
Decrease the selected value by 510% 
Using superplasticizer 
Decrease the selected value by 2030% 
For every increment of 25mm slump 
Increase the selected value by 3% 
Step 5: Selection of Cement Content for Concrete
Water β cement ratio is determined in step2 and quantity of water is determined in step 4. So, we can easily calculate the quantity of cement from these two conditions. But, the value obtained should satisfy the minimum conditions as given in the below table. The greater of the two values is decided as quantity of cement content.Cement Content for Plain Cement Concrete
Exposure 
Plain Cement Concrete (P.C.C) 

Minimum Cement Content Kg/m^{3} 
Max Free Water β Cement Ratio 
Minimum Grade of Concrete 

Mild 
220 
0.6 
 
Moderate 
240 
0.6 
M15 
Severe 
250 
0.5 
M20 
Very severe 
260 
0.45 
M20 
Extreme 
280 
0.4 
M25 
Cement Content for Reinforced Concrete
Exposure 
Reinforced Cement Concrete (RCC) 

Minimum Cement Content Kg/m^{3} 
Max Free Water βCement Ratio 
Minimum Grade of Concrete 

Mild 
300 
0.55 
M20 
Moderate 
300 
0.5 
M25 
Severe 
320 
0.45 
M30 
Very severe 
340 
0.45 
M35 
Extreme 
360 
0.4 
M40 
Step 6: Calculation of Aggregate Ratio
For the given nominal maximum size of aggregate, we can calculate the ratio of volumes of coarse aggregate and volume of total aggregates for different zones of fine aggregates from the below table.
Nominal maximum size of aggregate 
Ratio of volume of coarse aggregate and volume of total aggregate for different zones of fine aggregate 

Zone β 1 
Zone β 2 
Zone β 3 
Zone β 4 

10mm 
0.44 
0.46 
0.48 
0.50 
20mm 
0.6 
0.62 
0.64 
0.66 
40mm 
0.69 
0.71 
0.73 
0.75 