Coarse Aggregate Requirements

Example $2.$ A structure is to be built with concrete with a minimum dimension of $0\mathrm{.}2$ m $,$ minimum space between rebars of $40$ mm $,$ and minimum cover over rebars of $40$ mm $.$ Two types of aggregate are locally available, with maximum sizes of $19$ mm and $25$ mm $,$ respectively. If both types of aggregate have essentially the same cost, which one is more suitable for this structure?