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(A) Design Stipulation

The document provides specifications and calculations to design a concrete mix with a target strength of 60MPa. It specifies aggregate sizes and densities, and cement properties. It then calculates the weight of coarse aggregate, water quantity based on slump, weight of cement based on a water-cement ratio, weight of fine aggregate, and adjustment for superplasticizer dosage. The final concrete mix ratio is reported as 1:1.35:2.19:0.29:0.8 for cement, fine aggregate, coarse aggregate, water, and superplasticizer respectively per cubic meter of concrete.

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Sravan Kumar Anumolu
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44 views2 pages

(A) Design Stipulation

The document provides specifications and calculations to design a concrete mix with a target strength of 60MPa. It specifies aggregate sizes and densities, and cement properties. It then calculates the weight of coarse aggregate, water quantity based on slump, weight of cement based on a water-cement ratio, weight of fine aggregate, and adjustment for superplasticizer dosage. The final concrete mix ratio is reported as 1:1.35:2.19:0.29:0.8 for cement, fine aggregate, coarse aggregate, water, and superplasticizer respectively per cubic meter of concrete.

Uploaded by

Sravan Kumar Anumolu
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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(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/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

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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 = 0.7376m3
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): Superplasticizer (l/m3)

1: 1.35 :2.19 :0.29 :0.8

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