### Concrete Mix Design M-60

**CONCRETE MIX DESIGN (GRADE M60)**

**(a) DESIGN STIPULATION:-**

Target strength = 60Mpa

Max size of aggregate used = 12.5 mm

Specific gravity of cement = 3.15

Specific gravity of fine aggregate (F.A) = 2.6

Specific gravity of Coarse aggregate (C.A) = 2.64

Dry Rodded Bulk Density of fine aggregate = 1726 Kg/m^{3}

Dry Rodded Bulk Density of coarse aggregate = 1638 Kg/m^{3}

**Step-1**

Calculation for weight of Coarse Aggregate:

From ACI 211.4R Table 4.3.3 Fractional volume of oven dry Rodded C.A for 12.5mm size aggregate is 0.68m^{3}

Weight of C.A = 0.68*1638 = 1108.13 Kg/m^{3}

**Step-2**

Calculation for Quantity of Water:

From ACI 211.4R Table 4.3.4

Assuming Slump as 50 to 75mm and for C.A size 12.5 mm the Mixing water = 148 ml

Void content of FA for this mixing water = 35%

Void content of FA (V)

V = {1-(Dry Rodded unit wt / specific gravity of FA*1000)}*100

= [1-(1726/2.6*1000)]*100

= 34.62%

Adjustment in mixing water = (V-35)* 4.55

= (34.62 – 35)*4.55

= -1.725 ml

Total water required = 148 + (-1.725) = 146.28 ml

**Step-3**

Calculation for weight of cement

From ACI 211.4R Table 4.3.5(b)

Take W / C ratio = 0.29

Weight of cement = 146.28 / 0.29 = 504.21 kg/m^{3}

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**Step-4**
Calculation for weight of Fine Aggregate:

Cement = 504.21 / 3.15*1000= 0.1616

Water = 146.28 / 1*1000= 0.1462

CA = 1108.13 / 3*1000= 0.3690

Entrapped Air = 2 / 100= 0.020

Total = 0.7376m^{3}

Volume of Fine Aggregate= 1-0.7376

Weight of Fine Aggregate= 0.2624*2.6*1000= 683.24 kg/m^{3}

**Step-5**

Super plasticizer:

For 0.8% = (0.8 / 100)*583.53 = 4.668 ml

**Step-6**

Correction for water:

Weight of water (For 0.8%) =146.28 – 4.668 =141.61 kg/m^{3}

**Requirement of materials per Cubic meter**

Cement = 504.21 Kg/m^{3}

Fine Aggregate = 683.24 Kg/m^{3}

Coarse Aggregate = 1108.13 Kg/m^{3}

Water = 141.61 Kg/ m^{3}

Super plasticizers = 4.6681 / m^{3}

So the final ratio becomes

Cement : Fine agg (kg/m^{3}) : Coarse agg (kg/m^{3}) : Water (l/m^{3}): Superplasticizer (l/m^{3})

**1: 1.35 :2.19 :0.29 :0.8**

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This concrete mix design has been submitted to us by Natarajan. We are thankful to him for this valuable contribution.

### Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.
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