$1)$ Compute the form pressure for an $18$ ft tall column. Assume concrete is

placed at a rate of $9$ ft$/$h$,$ has a density of $145$ lb$/$ft$3$

$,$ a slump of $5$ in$.,$ and a

temperature of $75\backslash$deg F$.$ This concrete is made with a cement blend containing

$45\%$ slag, but no retarders. Internal vibration will occur in intervals less than

$4$ ft in depth.

$2)$ Repeat the same for the column of Problem $1$ using the same concrete

mixture, a retarder, a temperature of $90\backslash$deg F$,$ and at a rate R $=4$ ft$/$h$.$

$3)$ A wall form is filled with $80\backslash$deg F concrete placed to a height of $24$ ft at a rate R

$=8$ ft$/$h$.$ The concrete density is $125$ lb$/$ft$3,$ it contains a retarder, is made

with Type III cement, and has a $5$ in$.$ slump. It will be internally vibrated at

intervals less than $6$ ft$.$ Compute the wall form pressure.