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Mix design for M35 grade :- 1. Stipulations for Mix Design Concrete Grade designation : M 35 Type of cement : OPC 53 grade confirming to IS 8112 Maximum nominal size of aggregate : 20 mm Minimum cement content : 340 kg/m3 Maximum water-cement ratio : 0.45 Workability : 50-100 mm (slump)…
C Mallika
updated on 27 Jan 2023
Mix design for M35 grade :-
ftarget = fck + 1.65 x S
‘ftarget‘ is the target average compressive strength at 28 days,
‘fck‘ is the characteristic compressive strength at 28 days, and
‘s’ is the standard deviation
As per the table I of IS: 10262-2009 , standard deviation, s = 5.0 N/mm2
Therefore, target strength = 35 + 1.65 x 5.0 = 43.25 N/mm2
Maximum water-cement ratio = 0.45
Estimated water content for 100 mm slump =186+(6/100) x 186 =197 liter.
Water-cement ratio =0.45
Cement content = 147/0.45 = 350 kg/m3
In the present case, the water-cement ratio is 0.45. Therefore, the volume of coarse aggregate is required to be increased to reduce the fine aggregate content.
As the water-cement ratio is lower by 0.10, the proportion of the volume of coarse aggregate is increased by 0.02 (at the rate of -/+ 0.01 for every ± 0.05 change in the water-cement ratio). Therefore. the corrected proportion of the volume of coarse aggregate for the water-cement ratio of 0.45 = 0.63.
a) Volume of concrete = 1m3
b) Volume of cement = (Mass of cement/Specific Gravity of Cement) X (1/1000)
= (350/3.12) X (1/1000)
= 0.112 m3
c) Volume of water = (Mass of water/specific gravity of water) X (1/1000)
= (147/1) X (1/1000)
= 0.147 m3
d) Volume of superplasticizer = (Mass of superplasticizer / Specific gravity of admixture) X (1/1000)
= (7/1.145) X (1/1000)
= 0.006 m3
e) Volume of all aggregate = (a-(b+c+d))
= 1 – (0.112 + 0.147+0.006)
= 0.735 m3
f) Mass of coarse aggregate = Volume of all aggregate X volume of coarse aggregate X Specific gravity of coarse aggregate X 1000
= 0.735 x 0.567 x 2.74 x 1000
= 1141.88 kg
g)Mass of fine aggregate = Volume of all aggregate X volume of fine aggregate X Specific gravity of fine aggregate X 1000
= 0.735 x 0.433 x 2.56 x 1000
= 814.73 kg
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