How to Determine Quantities of Materials Needed

First figure the number of cubic feet of concrete that will be required for the work in question. Then by multiplying this number by the number under the proper column and required mixture shown in [Table III], the amounts of cement, sand, and stone or gravel can be found.

TABLE III.

Mixture. Quantities of Material in 1 Cu. Ft. of Concrete
Cement,
Barrel		Sand,
Cu. Yard		Stone or Gravel,
Cu. Yard
1 : 2 : 4 Concrete.058.0163.0326
1 : 2½ : 5 Concrete.048.0176.0352

Example

Suppose the work consists of a concrete silo requiring in all 935 cubic feet of concrete, of which 750 cubic feet is to be 1: 2: 4 concrete, and 185 cubic feet is to be 1: 2½: 5 concrete. Also enough sand and cement is needed to paint the silo inside and outside, in all 400 square yards of surface, with a 1: 1 mixture of sand and cement. One cubic foot of 1: 1 mortar will paint about 15 square yards of surface and requires 0.1856 barrels of cement and 0.0263 cubic yards of sand.

Solution, Etc.

Thus the necessary quantities of materials are:—

It is always wise to order two or three extra barrels of cement, if the dealer is at considerable distance, as this avoids any possible trouble that a shortage might cause. Besides, any cement left over always comes in handy for repair work around the house or barn.