Data Required for Concrete Mix Design
A) Design stipulations for M25
i)  Characteristic compressive strength required
in the field at 28 days 
25 N/mm2 
ii)  Max. size of aggregate  20mm 
iii)  Type of coarse aggregate  Crushed 
iv)  Type of fine aggregate  Crushed 
v)  Workability(Slump  25 50 mm 
vi)  Degree of quality control  Good 
vii)  Type of exposure  Moderate 
viii)  Type or brand of cement  A.C.C. ( PPC ) 
ix)  Type of Admixture  Sikka 
(1) Specific Gravity
i) 
Cement  2.82 
ii) 
Coarse aggregate  2.67 
iii) 
Fine aggregate 
2.60 
iv) 
Admixture Sikka 
1.20 
Coarse Aggregate 

i) 
20mm 
0.50% 
ii) 
10mm 
0.60% 
Fine aggregate 
1.80% 
Water Absorption
Coarse aggregate 

i) 
20mm  0.50% 
ii) 
10mm 
0.60% 
Fine aggregate 
1.80% 
(3) Free Surface Water
Coarse Aggregate  
i)  20mm  Nil 
ii)  10mm  Nil 
Fine Aggregate  Nil 
Coarse Aggregate.
TableI
Sieve size  % passing  
20mm Fraction1 
10mm Fraction2 

40mm  100  100 
20mm  95.9  100 
10mm  0  82.1 
4.75mm  0  20.9 
To satisfy the required grading of combined aggregates, the 20mm size and 10mm size
coarse aggregates are mixed in the following proportions.
Fraction 1 (20mm) : 52 %
Fraction 2 (10mm) : 48 %
The grading achieved of the blended aggregate is given is as under:
Sieve size  % passing observed 
Required as per T7 IS3832016 
40mm  100  100 
20mm  98  90100 
10mm  39  2555 
4.75mm  10  010 
(ii) Fine Aggregate: Sieve analysis of fine aggregate is given in table2.
Table2
Sieve size  % passing  Limits for zone â€“II 
10.0mm  100  100 
4.75mm  98.8  90100 
2.36mm  80.8  75100 
1.18mm  60.4  5590 
0.60mm  35.4  3559 
0.30mm  19.6  830 
0.15mm  2.4  010 
Fine aggregate belongs to ZoneII as per Table 9 of IS 3832016.
Procedure for Concrete Mix Design of M25 Concrete
A0 â€” Determination Of Target Strength
Himsworth constant for 5% risk factor is 1.65. In this case standard deviation is taken from IS:456 against M 25 is 4.0.
f_{target} = f_{ck} + 1.65 x S
= 25 + 1.65 x 4.0 = 31.60 N/mm^{2}
Where,
S = standard deviation in N/mm^{2 }= 4 (as per table 1 of IS 10262 2009)
For a tolerance factor of 1.65 and a standard deviation value of 4.0 the target mean strength
of concrete comes out to be equal to 31.60 N/mm^{2}.
A1 SELECTION OF WATER CEMENT RATIO
From table 5 of IS 456 on page no. 20, Maximum watercement ratio=0.50
Based on experience, adopt watercement ratio as 0.43, for the target mean strength and required workability
0.43<0.50, hence O.K.
A2 SELECTION OF WATER CONTENT
From Table 2 of IS 10262 2009,
Maximum water content = 186 Kg (for Nominal maximum size of aggregate â€” 20 mm)
Table for Correction in water content
Parameters  Values as per Standard reference condition  Values as per Present Problem  Departure  Correction in Water Content 
Slump  2550 mm  2550 mm  Nil  
Shape of Aggregate  Angular  Gravel with Crushed stone  20  
Admixture  Sikka  Based on Experience  10.50  
Total  30.50 
So, estimated water content = 186 – 30.50 = 155.50 litre /m^{3}
A3 CALCULATION OF CEMENT CONTENT
Watercement ratio = 0.43
Corrected water content = 155.50 litre /m^{3}
Cement content = 155.5 = 361.63 say 362 Kg/m^{3}
0.43
Minimum cement Content for moderate exposure condition = 300 kg/m^{3}
362 kg/m^{3} > 300 kg/m^{3}, hence, OK.
This value is to be checked for durability requirement from IS: 456.
In the present example against mild exposure and for the case of reinforced concrete the minimum cement content is 300 kg/m^{3} which is less than 362 kg/m^{3}. Hence cement content adopted = 362 kg/m^{3}.
As per clause 8.2.4.2 of IS: 456
Maximum cement content = 450 kg/m^{3}.
A4 PROPORTIONS OF VOLUME OF COARSE AGGREGATE AND FINE AGGREGATE CONTENT
From Table 3 of IS 10262:2009,
the volume of coarse aggregate per unit volume of total aggregate corresponding to 20mm size aggregate and fine aggregate (Zone II) for the watercement ratio of 0.43
The volume of coarse aggregate per unit volume of total aggregate is 0.634
Volume of fine aggregate is taken as 0.366
A5 MIX CALCULATIONS
The mix calculations per unit volume of concrete shall be as follows:
a) Volume of concrete = 1 m^{3</sup
b) Volume of cement = Mass of cement x 1_
Specific gravity of cement 1000
= (362/2.82) x (1/1000)
= 0.1284 m3
c) Volume of water = Mass of water x 1_
The specific gravity of water 1000
= (155.5/1) x (1/1000)
= 0.1555 m3
d) Volume of Chemical Admixture = Mass of Chemical Admixture x 1
Super Plasticizer @ 1.0% By Specific gravity of admixture 1000
Mass of cementations material)
= (3.45/1.20) x (1/1000)
=0.0029
e) Volume of all in aggregate = [ a (b + c + d) ]
= 0.7132 m3
f) Mass of coarse aggregate = 1207 Kg}
g) Mass of fine aggregate = 679 Kg
A6 (1) MIX PROPORTIONS FOR TRIAL NUMBER 1
Watercement ratio = 0.43
Quantity of cement = 362 Kg/m^{3}
Quantity of Water taken = 155.5 Kg/m^{3 }
Quantity of Fine aggregate = 679 Kg/m^{3}
Quantity of Coarse aggregate = 1207 Kg/m^{3}
Quantity of Admixture @ 1.0% = 3.45 Kg/m^{3}
A6 (2) MIX PROPORTIONS FOR TRIAL NUMBER 2
Watercement ratio = 0.45
Quantity of cement = 353 Kg/m^{3}
Quantity of Water taken = 159 Kg/m^{3 }
Quantity of Fine aggregate = 679 Kg/m^{3}
Quantity of Coarse aggregate = 1207 Kg/m^{3}
Quantity of Admixture @ 1.0% = 3.38 Kg/m^{3}
A6 (3) MIX PROPORTIONS FOR TRIAL NUMBER 3
Watercement ratio = 0.46
Quantity of cement = 352 Kg/m^{3}
Quantity of Water taken = 162 Kg/m^{3 }
Quantity of Fine aggregate = 684 Kg/m^{3}
Quantity of Coarse aggregate = 1216 Kg/m^{3}
Quantity of Admixture @ 1.0% = 3.10 Kg/m^{3}
The concrete cubes (150mm x 150mm) were cast with these mixes and the following results were obtained.
</table border=1> RECOMMENDATIONS.The 28 days compressive strength of trial mix no.3 fulfills the design criteria as per IS 10262:2009. Hence recommended being adopted for M25 grade Cement concrete.
Quantities of Material for one cubic meter of concreteWater = 162 KgCement = 352 KgSand = 679 KgCoarse aggregate = 1207 KgFraction1 (20mm) = 603.50 KgFraction2 (10mm) = 579 KgQuantity of Admixture @ 1.0% = 3.10 KgThe above concrete mix design holds good for the samples provided that the parameters taken for the mix design remain the same as taken and aggregates fall within close to their individual grading as mentioned above. The design was on saturated surface dry condition of aggregate when computing the requirement of mixing water, allowance must be made for free surface moisture content or for water absorption dry aggregate Necessary adjustment shall be made in the mass of aggregate. In actual execution, if there is a change in the grading of different materials, the proportions of mixing materials can be changed to achieve the required grading. Quantity of aggregates and water may please be adjusted according to the free moisture present in the aggregates at the time of mix preparations.
Mix No.  Water  Cement  W/C Ratio  Slump (mm)  28days Compressive
Strength. N/mm2. 
1  155.5  362  0.43  45  31.11 
2  159  353  0.45  51  32.89 
3  162  352  0.46  55  33.33 
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