written 5.7 years ago by |
i) Ratio of fine to total aggregate = 0.315
ii) Water Content = 190kg/m3
iii) Amount of entrapped air = 2%
iv) Specific gravity of cement = 3.15
v) Specific gravity of F.A = 2.68
vi) Specific gravity of C.A = 2.85
vii) Water Cement ratio = 0.50
Determine quantity of cement FA and CA per m3 of concrete.
Aggregate content can be determined from following equation
V=[W+CSC+1PFaSFa]11000
Determination of water content
Water / Cement ratio =0.5
Water = 190kg/m3
Cement = 1900.50=380kg/m3
V= Absolute volume of fresh concrete, which is equal to gross volume (m3) minus the volume of entrapped air
V =1(m3)−2%
1−0.2
0.98m3
V=[W+CSC+1PFaSFa]11000
0.98=[190+3803.15+10.315Fa2.08]11000
Fa = 565kg/m3
Ca=1−PP×FaSCaFCa
Ca=1−0.3150.315×5652.852068
1306.58kg/m3
The mix portion then becomes
Water | Cement | F.A | C.A |
---|---|---|---|
190 | 380 | 565 | 1306.5 |
0.5 | 1 | 1.486 | 3.438 |