The number of men required is determined by the amount of concrete to be
placed in a given time, the method of mixing, and the size of the batch;
that is, the number of bags of cement mixed at one time. The amount of
concrete one man can mix by hand in a day depends upon the experience of
the man, the layout of the work, and other duties required of him. One
man should average 1-1/2 to 1-3/4 cubic yards of concrete in eight hours,
including mixing and wheeling not more than 50 feet.
The gang for a one-bag batch may consist of 3 men, but a larger number
make a more efficient force, for when the concrete is mixed by hand the
men can take turns at the various tasks and will not tire so easily. The
assigning of tasks so that each man's time fits into that of the others
requires considerable study and is one of the chief factors making for
loss or profit.