Find quantity of sand required

Find quantity of sand required for the following items.

Cement concrete (1:4:8) 10 cu.m.

UCR masonry in C.M. (1:6) 20 cu.m.

B.B. masonry in C.M. (1:5) 40 cu.m.

12 mm thick cement plaster (1:5) 100 sq.m.

Sand quantity

Cement concrete (1:4:8) 10 cu.m.

Quantity of sand

= [(1.52 x 10)/(1+4+8)] x 4

= 4.676 cu.m. say 4.7 m³

UCR masonry in C.M. (1:6) 20 cu.m.

Assume @ 50% of dry mortar i.e. 10 cu.m.

Therefore, sand required

= (10/1+6) x 6

= 8.57 m³

B.B. masonry in C.M. (1:5) 40 cu.m.

Assume 30% dry mortar

Therefore,

30 x 40

= 12 cu.m.

Therefor, sand required

= (12/1+5) x 5

= 10 cu.m.

12 mm thick cement plaster (1:5) 100 sq.m.

Wet mortar required

= 100 x (12/1000)

= 1.2 cu.m.

To fill up joints etc. add 30%

i.e. 1.3 x 1.2

= 1.56 cu.m.

Therefore.

Quantity of sand required

= 1.95/1+5

= 1.625 cu.m.