masonry retaining walls

huangyhg

masonry retaining walls
does anyone have any insight into the practical height for a 12" cmu retaining wall.  i normally stop at 12' high but i have seen several that are higher and i wonder how they get that without exceeding fm
perhaps they use a higher f'm.  you can specify f'm values greater than the typical (for us anyway) f'm = 1500 psi.