Concrete Mix Design – M60 Grade Of Concrete (OPC 53 Grade)

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Concrete mix design – M60 grade of concrete provided here is for reference purpose only. Actual site conditions vary and thus this should be adjusted as per the location and other factors.

A. Design Stipulation:
Charastaristic comprehensive Strength @ 28 days = 60 N/mm²
Maximum size of aggregate = 20 mm
Degree of workability = Collapsible
Degree of quality control = Good
Type of exposure = Severe
Minimum cement content as per is 456-2000

B. Test data for concrete ingredients
Specific gravity of cement = 3.15
Specific gravity of fly ash = 2.24
Specific gravity of microsilica = 2.21
Setting time of cement initial = 120 min, final = 185 min
Cement compressive strength =
45.21 N/mm² @ 3 days
54.82 N/mm² @ 7 days
69.32 N/mm² @ 28 days
Specific gravity of coarse aggregates (ca) and fine aggregates (fa)
20 mm 2.729
10 mm 2.747
R/sand 2.751
C/sand 2.697

Water absorption
20 mm 1.540, 10mm 1.780, R/sand 3.780, C/sand 4.490

Characterstic strength @ 28 days 60 N/mm²
Target mean strength : Depend upon degree of quality control “good” and considering (std. Dev.As 5 N/mm²)

Characteristic strength given by the relation 60 +(1.65 *5 ) = 68.25 N/mm²

C. Quantities of ingredients ( by absolute volume Method )
Actual cement used = 450 kg/cum
Actual fly ash used = 80 kg/cum
Actual microsilica used = 40 kg/cum
W/C fixed = 0.24
Absolute volume of cement = 0.143
Absolute volume of air = 0.02
Absolute vol of water. = 0.137
Absolute vol of fly ash. = 0.036
Absolute vol of microsilica = 0.018

Total volume of CA and FA used = 1.00-(0.143+0.036+0.018+0.02 +0.137)
= 0.619 Cum

D. Aggregate percent used.
20 Mm = 31, 10 mm = 25, r/sand = 34, c/sand = 10

(2.729*0.31) + (2.747*0.25) +(2.751* 0.34 )+(2.697*0.10) *0.619*1000
546+444+604+174=1768
Aggt: cement = 3.10 : 1

Mix proportion = 0.24:1:1.06:0.30:0.78:0.96

E. Abstract:
20 mm 546 kg/cum
10 mm 444 kg/cum
r/sand 604 kg /cum
c/sand 174 kg/cum
water 137 kg/cum

Admixture 1.80 % By wt of (C+F+MS) chemsonite SP 450XL-B

Cube Compressive Strength (N/mm²)
3 days = 40.98
7 Days = 57.71
28 Days = 70.96

Note: Mix design is same for crane bucket and pump concrete only admixture dosage will fine tuned by 0.10%.
We are thankful to Deshmukh D S for submitting this very useful mix design information to us.

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