CONCRETE MIX DESIGN-GRADE M60.

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/m³
Dry Rodded Bulk Density of coarse aggregate = 1638 Kg/m³

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 0.68m³
Weight of C.A = 0.68*1638 = 1108.13 Kg/m³

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/m³

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 = 0.7376m³
Volume of Fine Aggregate= 1-0.7376
Weight of Fine Aggregate= 0.2624*2.6*1000= 683.24 kg/m³

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/m³

Requirement of materials per Cubic meter
Cement = 504.21 Kg/m³
Fine Aggregate = 683.24 Kg/m³
Coarse Aggregate = 1108.13 Kg/m³
Water = 141.61 Kg/ m³
Super plasticizers = 4.6681 / m³

So the final ratio becomes
Cement: Fine agg. (kg/m³): Coarse agg. (kg/m³): Water (l/m³): Super plasticizer (l/m³)

Hence

1:1.35:2.19:0.29:0.8.