# Concrete Mix Design M-60

Posted in Mix Design | Email This Post |**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}

**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**

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

Bug holes and pin holes can be eliminated by using Hypercrete , SCC admixture @1000ml/100kg of cement. You can go to very law w/c ratio like 0.2 and achieve very high strength with comparably very law cement content while having self compacting properties. Hypercrete can be used in high dosage for G70 or G80 concrete. Sometime you may have to blend the concrete mix with 10 -15% silica fume.

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Dear All

Although IS 456 limits the use of cement / cu.m to 450 kgs, it can be increased upto 540 kgs as per MORTH standard. However difficulties encountered during hot climate has to be taken into account to avoid thermal cracks. Also please note the proportions obtained on calculations from IS 10262 are only a guidance, however trial mixes have to be done to observe the properties of fresh concrete viz., cohesiveness (for enhance pumpability), workability etc. CA & FA proportions may be changed purely on All – in -aggregate curves. For high strength concrete it is normal practice to add MICROSILICA @ 5 – 8 % of cement content to achieve desired strength.

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