Project on Concrete Mix Design for various grades of Concrete
Concrete Mix Design for M35 grade concrete with flyash
Data required:
a) Grade of concrete M35
b)Maximum nominal size of aggregate 20mm
c)Environment exposure condition (assume) severe
d)Minimum cement content: 320 kg (for severe condition)
e)Workability (in terms of slump) 100mm
f)Grading zone of fine aggregate (assume) zone 1
g)Specific gravity of cement: 3.15
h)Specific gravity of Coarse Aggregate: 2.74
i)Specific gravity of Fine Aggregate: 2.74
1) Target Mean Strength(f'ck):
f'ck=fck+1.65s
s=5 (from table 8 of IS code 10262:1982)
f'ck= 35+1.65*5=43.25N/mm^2
2) Selection of water cement ratio:
calculate the water cement ratio from graph 1 of IS code 10262:1982
for f'ck=43.25
water cement ratio=0.35
From graph 2 of IS code 10262:1982
water cement ratio= 0.34
water cement ratio as per environment exposure condition from table 5 of IS code 456:2000
for severe condition and reinforce concrete
water cement ratio=0.45
Hence, the lower value of the above three is adobted as the water cement ratio so,
here, water cement ratio=0.34
3) Selection of water content:
(from table 2 of IS10262:2009)
Maximum water content for slump between 25mm to 50mm= 186kg or lit
and addition slump of 3% may be added for every 25mm slump
so here, for 100mm slump 6% is added
water content= 6/100*186+186=197.16kg
4) Selection of cement content:
here, water cement ratio=0.34
i.e., cement=197.16/0.34=580kg
Now we use Flyash So Lets assume 10% cementitious material content
cementitious material content=580*1.10=638kg/m^3
water content=197.16kg/m^3
so, water cement ratio=197.16/638=0.31
Flyash @30%of total content= 638*30%191.4kg/m^3
cement used=446.6kg/m^3
5)Volume of Coarse and Fine aggregate:
Here, fine aggregate is in zone one so the volume so coarse aggregate is 60%or 0.6
and change is water cement ratio=0.5-0.31=0.19
so corrected volume of coarse aggregate=0.64
but for pumpable concrete volume of aggregate is decreased by 10%
Volume of Coarse aggregate = 0.64*0.9=0.58
and Volume of Fine aggregate= 1-0.58=0.42
6)Mix Calculations:
Volume of concrete=1m^3
Volume of cement=(446/3.15)*(1/1000)=0.142
volume of water=(197.16/1)*(1/1000)=0.197
Volume of Aggregate=1-(0.142+0.197)=0.661
Mass of Coarse aggregate= 0.661*0.58*2.74*1000=1050kg/m^3
Mass of Fine aggregate= 0.661*0.42*2.74*1000=761kg/m^3
7)Mix Proportion:
Cement:446kg/m^3
Water:197.16kg/m^3
Fine Aggregate:760kg/m^3
Coarse Aggregate:1050kg/m^3
Water cement ratio:0.34
8) Mix Ratio:
1:1.7:2.4
Concrete Mix Design for M35 grade concrete
Data required:
a) Grade of concrete M50
b)Maximum nominal size of aggregate 20mm
c)Environment exposure condition (assume) severe
d)Minimum cement content: 320 kg (for severe condition)
e)Workability (in terms of slump) 100mm
f)Grading zone of fine aggregate (assume) zone 1
g)Specific gravity of cement: 3.15
h)Specific gravity of Coarse Aggregate: 2.74
i)Specific gravity of Fine Aggregate: 2.74
1) Target Mean Strength(f'ck):
f'ck=fck+1.65s
s=5 (from table 8 of IS code 10262:1982)
f'ck= 50+1.65*5=58.25N/mm^2
2) Selection of water cement ratio:
calculate the water cement ratio from graph 1 of IS code 10262:2019
for f'ck=58.25
water cement ratio=0.33
From graph 2 of IS code 10262:1982
water cement ratio= 0.34
water cement ratio as per environment exposure condition from table 5 of IS code 456:2000
for severe condition and reinforce concrete
water cement ratio=0.45
Hence, the lower value of the above three is adobted as the water cement ratio so,
here, water cement ratio=0.33
3) Selection of water content:
(from table 2 of IS10262:2009)
Maximum water content for slump between 25mm to 50mm= 186kg or lit
and addition slump of 3% may be added for every 25mm slump
so here, for 100mm slump 6% is added
water content= 6/100*186+186=197.16kg
4) Selection of cement content:
here, water cement ratio=0.33
i.e., cement=197.16/0.33=597kg
5)Volume of Coarse and Fine aggregate:
Here, fine aggregate is in zone 1 so the volume so coarse aggregate is 60%or 0.6
and change is water cement ratio=0.5-0.33=0.17
so corrected volume of coarse aggregate=0.634
but for pumpable concrete volume of aggregate is decreased by 10%
Volume of Coarse aggregate = 0.634*0.9=0.57
and Volume of Fine aggregate= 1-0.57=0.43
6)Mix Calculations:
Volume of concrete=1m^3
Volume of cement=(597/3.15)*(1/1000)=0.190
volume of water=(197.16/1)*(1/1000)=0.197
Volume of Aggregate=1-(0.190+0.197)=0.613
Mass of Coarse aggregate= 0.634*0.57*2.74*1000=990kg/m^3
Mass of Fine aggregate= 0.634*0.43*2.74*1000=747kg/m^3
7)Mix Proportion:
Cement:597kg/m^3
Water:197.16kg/m^3
Fine Aggregate:747kg/m^3
Coarse Aggregate:990kg/m^3
Water cement ratio:0.34
8) Mix Ratio:
1:1.25:1.66