Example
given
Wet volume 1 cu.m
M15
ratio 1:2:4
solution
quantity of cement
= 1.54/7 (dry volume of cement = 1.54 x wet volume of cement in mix)
= 0.22 cu.m
= 0.22 x 1440 (density of cement = 1440 kg/cu.m)
= 316.8 kg
= 316.8/50 (weight of 1 cement bag = 50 kg)
= 6.4 bags
= 7 bags of cement
mix compressive strength in 28 days ratio water/cement bag
(N/sq.mm) (Leter)
M5 5 1:5:10 60
M7.5 7.5 1:4:8 45
M10 10 1:3:6 34
M15 15 1:2:4 32
M20 20 1:1.5:3 30
M25 25 1:1:2 28
given
Wet volume 1 cu.m
M15
ratio 1:2:4
solution
quantity of cement
= 1.54/7 (dry volume of cement = 1.54 x wet volume of cement in mix)
= 0.22 cu.m
= 0.22 x 1440 (density of cement = 1440 kg/cu.m)
= 316.8 kg
= 316.8/50 (weight of 1 cement bag = 50 kg)
= 6.4 bags
= 7 bags of cement
Note 1;
mix compressive strength in 28 days ratio water/cement bag
(N/sq.mm) (Leter)
M5 5 1:5:10 60
M7.5 7.5 1:4:8 45
M10 10 1:3:6 34
M15 15 1:2:4 32
M20 20 1:1.5:3 30
M25 25 1:1:2 28
Note 2;
wet volume of concrete = 1 cu. m considered
dry volume = 54 % increase by wet volume
Dry volume = 1.54 x wet volume
Density
Cement = 1440 kg/cu.m
Cement = 1.226 kg/cu.ft
fine aggregates = 1450-1600 kg/cu.m
course aggregate = 1450-1500 kg/cu.m
Steel Quantity
member % of steel weight of steel
Slab 0.7- 1 % | 55 - 78 kg / cu.m.
Column 0.8- 6 % | 62.80 - 471 kg / cu.m.
Beam 1- 2 % | 78.5 - 157 kg / cu.m.
Foundation 0.5- 8 % | 39.25 - 62.80 kg / cu.m.
Steel Quantity
member % of steel weight of steel
Slab 0.7- 1 % | 55 - 78 kg / cu.m.
Column 0.8- 6 % | 62.80 - 471 kg / cu.m.
Beam 1- 2 % | 78.5 - 157 kg / cu.m.
Foundation 0.5- 8 % | 39.25 - 62.80 kg / cu.m.
No comments:
Post a Comment