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

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/mm^{2}

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/mm^{2} @ 3 days

54.82 N/mm^{2} @ 7 days

69.32 N/mm^{2} @ 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/mm^{2}

Target mean strength : Depend upon degree of quality control “good” and considering (std. Dev.As 5 N/mm^{2})

Characteristic strength given by the relation 60 +(1.65 *5 ) = 68.25 N/mm^{2}

**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/mm ^{2})**

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.*