Mix Design Calculations

PRC-II Lab Section : “ C ”

Compressive Strength = f c’ = 22.5 Mpa Sp. Gravity Of Cement = Sc = 3.15 Sp. Gravity Of Fine Aggregate = Sf = 2.63 Sp. Gravity Of Coarse Aggregate = Sc.a = 2.56 Fineness Modulus Of Fine Aggregate = F.M = 2.72 Water Absorption For Coarse Aggregate = Wc.a = 1.0 % Water Absorption For Fine Aggregate = Wf = 1.2 % Roaeded Bulk Density Of Coarse Aggregate Aggregate = Dr = 3 1507 kg/m Slump Value = 75 mm ; Max. Aggregate Size = 24 mm 1) Target Target Stren Strength gth : ’ ’ f cr cr = f c + 8.3 = 22.5 + 8.3 = 30.8

MPa

’ f cr cr = 30.8

Mpa

2) Cement Cement Type Type :

Ordinary Portland Cement 3) W/C W/C Rati Ratio o:

From Table # 10.8 ; for

’ f cr cr =30.8

Mpa :

4) Worka Workabi bilit lity y:

From Table # 10.16(a); Relative Water Content = From Table # 10.16(b); Non-Air Water Content = Aggregate size)

w/c ratio = 0.528 %

192 % (►Slump Test) 3 196 kg/m (►Max.

Total Water = Relative Water Content x Non-Air Water Content

Total Water = 180.2 kg/m3 5) %age %age Air Void Voids s: %age Air Voids = 1.6 %

From Table # 10.16(b) ;

(►Max. Aggregate size)

6) Cement Cement Cont Content ent :

Section : “ C ”

Mix Design Calculations

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PRC-II Lab Section : “ C ” Total Water

= 180.32 kg/m3

w/c ratio = 0.528 % = Total Water / w/c

Cement

Cement = kg/m3

ratio 7) Aggregate Selection :

Type Of Fine Aggregate Type Of Coarse Aggregate

= =

341.52

? ?

8) Amount Amount Of Coarse Coarse aggrega aggregate te :

From Table # 10.17 ; we get = 0.668

;

(►For Fineness

Modulus )

Bulk Weight = 0.668 x Dr = 0.668 x 1507

Amount Of Fine aggregate : 9)

Bulk Weight Of Coarse = 1006.68 kg/m3

Bulk Volume Of Cement = Cement /3.15 108.52 kg/m3 Bulk Volume Of Coarse Aggregate = Bulk Weight / Sc.a kg/m3 Bulk Volume Of Water = Total Water 3 kg/m Air Entrapped = 1.6 % of 1000 3 kg/m

= = 393.33 = 180.32 = 16 Total =

3

697.97 kg/m

Bulk Volume Of Sand = 1000 – ( Total) = 302.03 kg/m3 Bulk Weight =

Bulk Volume Of Sand

x

Sf

= 794.34kg/m 3

Bulk Weight Of Fine = 794.34 kg/m3



PRC-II Lab Section : “ C ” Total Water

= Sum of All Water Calculated = 199.92 kg/m3

Final Total Water = 199.92 kg/m3

Cement : Crush

: Sand 341.52 1

: 794.34 : 1006.68 : 2.33 : 2.95

_ Adjusted w/c Ratio = Final Water/Cement wt.

= 199.92/341.52

Adjusted w/c Ratio = 0.585 %



PRC-II Lab Section : “ C ”

Weight of Concrete Cylinders = 4 { π/4 x 0.152 x 0.3 x 2400} = 50.9 kg Cubes = 2 {0.15 x 0.15 x 0.15 x 2400} = 16.2 kg Columns = 4 {0.1 x 0.1 x 0.5 x 2400} = 48kg Beams = 4{0.075 x 0.15 x 1.375 x 2400} = 148.5 kg

Total weight of concrete = 263.6 kg Assuming 5% losses: Total wt. of concrete = 263.6 x 1.05 = 276.78 kg = 280 kg Weight of one batch = 140 kg

Quantities Cement = 1/6.28 x 140 = 22.3 kg Sand = 2.33/6.28 x 140 = 51.94 kg Crush = 2.95/6.28 x140 = 65.8 kg Water = 0.585 x 22.3 = 13.05 kg

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Mix Design Calculations

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