Project on Concrete Mix Design for various grades of Concrete
M35 Grade concrete with fly ash :
Aim:
To Calculate the mix design ratio of M35 grade concrete by adding fly ash.
Test Data for materials :
a) Cement - OPC 43
b) Specific gravity - 3.15
c) Specific gravity of Coarse agreegate - 2.74
d) Specific gravity of fine agreegate - 2.74
e) Water obsorption
Coarse agreegate - 0.5 %
Fine agreegate - 1.0 %
f) Free surface moisture Coarse agreegate & Fine agreegate - Nil
Step 1:
Target mean Strength - F'ck = fck + 1.65 s
S= 5 N/mm2
Ts= 35+1.65*5 = 43.25 N/mm2
Step 2: Water content :
= 186+6/100*186
= 157 litre
= 157*0.71 = 160 litre
Step 3: Cement Content :
W/c= 0.4
Cement content = 160/0.4 = 355.55kg/m3
Step 4: Adding of fly ash:
Cementious content of fly ash (cement + fly ash)
= 355.55* 1.10
= 391 kg
Water content = 140 kg/m3
Water cement ratio= 140/391
= 0.358
Fly ash @ 30% toatal cementious material content = 391*30/100 = 118kg/m3
= 391-118 = 273 kg/m3
Cement while using fly ash = 355.55 - 273
= 82.55 kg/m3
fly ash being utilized = 118 kg/m3
Step 5 :
Volume of Coarse agreegate = 0.62*0.9= 0.56
Volume of fine agreegate = 1-0.56= 0.44
Step 6 : Mix calculateion :
Volume of concrete = 1 M3
Volume of Cement = 0.087 m3
Volume of fly ash = 0.014 m3
Volume of water = 0.160 m3
Volume of superplasticizers = 0.0002 m3
Volume of Toatal agreegate = 0.71 m3
Coarse agreegate = 0.71*0.63 *2.74 *1000
= 1225.6 kg
Fine agreegate = 0.71*0.37*2.74 *1000
= 719.8 kg
Step 7 : Mix Properties
Cement = 275 kg
Fly ash = 118 kg
Fine agreegate = 720 kg
Coarse agreegate = 1226 kg
Water = 160 liter
Superplasticizer = 2L
Result :
M35 grade concrete mix design :
Cement : Fly ash : FA : CA : Water = 1 : 0.4: 2.6 : 4.46 : 0.58
Mix design of M50 Concrete Concrete :
Aim:
To Calculate the mix design ratio of M50 grade concrete.
Test Data for materials :
a) Cement - OPC 43
b) Specific gravity - 3.15
c) Specific gravity of Coarse agreegate - 2.74
d) Specific gravity of fine agreegate - 2.74
e) Water obsorption
Coarse agreegate - 0.5 %
Fine agreegate - 1.0 %
f) Free surface moisture Coarse agreegate & Fine agreegate - Nil
Step 1:
Target mean Strength - F'ck = fck + 1.65 s
S= 5 N/mm2
Ts= 50+1.65*5 = 58.25 N/mm2
Step 2: Water content :
= 186+6/100*186
= 157 litre
= 157*0.71 = 160 litre
Step 3: Cement Content :
W/c= 0.4
Cement content = 160/0.4 = 355.55kg/m3
Water content = 140 kg/m3
Water cement ratio= 140/355.55
= 0.393
Step 4:
Volume of Coarse agreegate = 0.62*0.9= 0.56
Volume of fine agreegate = 1-0.56= 0.44
Step 5 : Mix calculateion :
Volume of concrete = 1 M3
Volume of Cement = 0.1308 m3
Volume of water = 0.1440 m3
Volume of superplasticizers = 0.00043 m3
Volume of Toatal agreegate = 0.2791 m3
Coarse agreegate =0.4830 X 2.655 X 1000 = 1282.365 kg/ m3
Fine agreegate = 0.2379 X 2.61 X 1000 = 620.919 kg/ m3
Step 6: Mix Properties
Cement = 422 kg
Fine agreegate = 621 kg
Coarse agreegate = 706 kg
Water = 160 liter
Superplasticizer = 1.5L
Result :
M35 grade concrete mix design :
Cement : FA : CA : Water = 1 : 1.472 : 3.043 : 0.35